Analysis of Adaptability of TBM in Trial Boring Stage of Super long Tunnel（超特长隧洞TBM集群试掘进阶段适应性分析）

The total length of the 2nd stage water transfer project in the northern area of Xinjiang of China is 540 km. The project consists of three tunnels, namely Xi Er (XE) Tunnel, Ka Shuang (KS) Tunnel and Shuang San (SS)〖HJ6.5mm〗 Tunnel, with lengths of 139.04 km, 283.27 km and 92.15 km respectively. All of these three tunnels have deep cover and are super long tunnels, and 95.6% of the total length of these three tunnels is constructed by TBMs. KS Tunnel is the longest water tunnel built or under construction in the world. In the paper, the trial TBM boring scheme and schedule of the water transfer project are introduced; the geological conditions revealed are statistically analyzed; and main project difficulties, i.e. durability of key equipment in long distance driving, passing through fault and fracture zones, water inrush, single head ventilation and transportation in long distance tunneling, anti slope drainage, and rock breaking efficiency and boring efficiency, are put forward. The adaptability of the TBMs used is analyzed from the aspects of adaptability to different surrounding rocks, adaptability to bad geological conditions and countermeasures, long distance ventilation and belt conveyor mucking and countermeasures, and TBM boring stability (such as equipment availability, boring time proportion, system malfunction and operation time). The following conclusions are obtained: (1) Accurate geological survey is the precondition of efficient tunneling. (2) The open type TBM can better adapt to Grade Ⅱ and Ⅲ of surrounding rocks, jointed and fractured zones and small faults; the adaptability of the TBMs used to the large scale fault fracture zones and water rich strata in this project is poor, and it needs to be improved in aspects of TBM equipment, supporting and construction technology. (3) The average availability of the TBM equipment in the trial boring stage is 89.9%, however, the malfunction rate of some ancillary equipment is high, particularly oil leakages occur to the main bearing seals; in order to achieve long distance tunneling, it is necessary to further improve the reliability and durability of the TBM equipment. (4) The average net boring efficiency in the trial boring stage is 296%, and TBM1 in Section Ⅱ of SS Tunnel achieves up to 45.2 % net boring efficiency; and highest monthly progress rate is 1 280 m, which created the highest record of the open type TBM boring in China. (5) TBM need to make great efforts to achieve 90% of the equipment system′s availability and over 40% of the tunneling efficiency.     

Challenges and Countermeasures in Construction of  Gaoligongshan Tunnel of Dali Ruili Railway（大瑞铁路高黎贡山隧道施工挑战与对策）

In order to resolve the challenges encountered in the construction of Gaoligongshan Tunnel such as soft rock deformation of inclined shafts, water drainage and protection of vertical shafts, TBM jam in crossing areas with adverse geology, solutions and key construction techniques are developed through theoretical analysis, field test, scheme optimization and staged review and summary. The performance results of field practice show that: (1)the goal of no damages and no replacement of the primary support can be achieved by adopting the comprehensive deformation prevention technique of "ring support early formation and quick closure", setting of proper excavation line curvature, and reinforcing of support; (2)the risk of vertical shaft flooding during construction in water rich weak granite can be greatly reduced by adopting the water control principle of "exploration for any excavation, plugging as the main method, and supplemented with drainage method" and the key pre grouting technique of S shaped deep boreholes; (3)the open type TBM can quickly and safely pass through the unfavorable mylonitic granite stratum by adopting the small pilot tunnel construction method, thus the fast and high efficiency construction performance of TBM can be fully utilized.     

Representative Projects and Development Trend of Underwater Shield Tunnels in China（我国水下盾构隧道代表性工程与发展趋势）

In the 21st century, the underwater tunnels have advanced rapidly in China. A large number of projects, completed or ongoing, have greatly promoted the advancement of underwater shield tunnel technologies in China and in the world. The development history of the underwater tunnels in China is summarized, and the technical challenges and breakthroughs encountered and achieved during the construction of many tunnels are presented, as represented by Nanjing Yangtze River Tunnel and Shiziyang Tunnel of Guangzhou Shenzhen Hong Kong High speed Railway. The characteristics and challenges of some representative underwater tunnels during construction, including Road Railway Yangtze River Tunnel in Sanyang Road, Shiziyang Tunnel of Foshan Dongguan Intercity Railway, Yangtze River Tunnel of Suzhou Nantong UHV Power Transmission and Transformation Project; and projects to be constructed, such as Pearl River Estuary Tunnel of Shenzhen Maoming Railway, Shantou Bay Subsea Tunnel of Shantou Shanwei High speed Railway, and Nanjing Heyan Road Yangtze River Tunnel, are presented as well. The development trend of China′s underwater shield tunnels, including from single soft soil formation to complex soil formation, from large diameter to super large diameter, from medium water pressure to high and ultra high water pressure, from ordinary to special and unfavorable geological conditions, from seismic regions with moderate intensity to those with high intensity, and from single construction method to combination of multiple methods, are analyzed. It is pointed out that the technical fields still require further study and innovation, and the areas still require further enhancement and innovation, such as the norms, codes, designs, constructions, equipment, materials and management.     

Study of Tunneling Technology in Tertiary Sandy Mudstone Strata with Rich Water under High Pressure: Case Study of Shuangfeng Tunnel of Mudanjiang Suifenhe Railway（第三系高压富水砂泥岩地层隧道技术研究——以牡绥铁路双丰隧道为例）

In order to deal with the technical problems of Shuangfeng Tunnel passing through water rich Tertiary sandy mudstone strata with long distance and big overburden, such as dewatering, advance reinforcement, structural design and construction method etc., reducing tunnel deformation, preventing water inrush, gushing mud and tunnel collapse, the technical route of "stereo exploration, pressure reduction by water releasing, pre grouting, supporting timely, overall monitoring" is established after the field test and data analysis. Methods of full dimensional exploration and water pressure reducing are proposed, which form the preceding reinforcing technology that are different between inside the excavation contour and outside the excavation contour. Support linings are constructed immediately after excavation of upper bench. Safety performance of tunnel structure is evaluated according to the monitoring results. The research is conducted based on Shuangfeng Tunnel and the study results are applied in the construction of the tunnel. Results indicate that it can make sense to control deformation and ensure safety by using methods of reducing pressure through full dimensional water release, adopting advance reinforcement measures that are different between inside the excavation contour and outside the excavation contour, proposing mini bench method during tunnel construction and supporting timely after excavation for tunnels passing through water rich Tertiary sandy mudstone strata.     

Innovation and Practice of Hard Rock TBM in China（我国硬岩掘进机的创新与实践）

In recent years, with the help of good national policy support, the design, manufacturing and construction technology for tunnel boring machine (TBM) in China have been greatly improved; but compared with foreign relatively proven technology, there is still a certain gap for domestic technology development and engineering application. Based on the situation analysis of research and application of TBM in China and abroad, the research work for TBM design is carried out according to the complex geological conditions of Gaoligongshan Tunnel on Dali Ruili Railway as follows. (1) The prototype disc cutter rock breaking and scaled disc cutter wearing experiment are carried out to provide reference for adaptable design of TBM cutterhead and key parameter calculation. (2) The TBM design scheme is discussed from the aspects of high efficiency rock breaking of cutters and cutterhead, TBM over excavation, integrated support system, etc. (3) Two kinds of advanced geological prediction technology, i.e. HSP method and RTP method, are researched. The study results can provide reference for design and manufacture of TBM with high adaptability in complex geology and construction application in Gaoligongshan Tunnel.     

Innovation and Practice of Parallel Dual mode Slurry/EPB Shield Construction Technology and Freezing Cutterhead Opening Technology（并联式泥水/土压双模式盾构施工技术与冷冻刀盘开舱技术的创新与实践）

Two major concerns have been drawn in the process of shield construction: one is the difficulty in selecting a shield machine; the other is the high risk of opening for cutterhead changing. Based on the existing shield systems, a parallel dual mode shield with freezing cutterhead is developed by optimising internal structure and equipment and carrying the freezing device. The dual mode shield construction technology and freezing cutterhead technology are successfully carried out on project cases including Guangzhou Metro Line 9, Guangzhou Metro Line 21 and 220 kV Shijing Huanxi Electric Tunnel (Xiwan Road Shisha Road Section). The parallel dual mode slurry/EPB shield not only has the functions and advantages of slurry shield and EPB shield but also can switch into slurry/EPB mode for different strata and environments easily. Thus, it can achieve rapid shield tunneling. By combining the shield with the freezing system, the soil around cutterhead can be frozen to provide conditions for chamber opening under atmospheric condition. Meanwhile, it is also compatible with dual mode shield.     

Development and Thinking of Tunnels and Underground Engineering in China in Recent 2 Years （From 2017 to 2018）（近2年我国隧道及地下工程发展与思考（2017—2018年））

The author gives an overview of the development of tunnels and underground engineering in China in the past two years, including railway tunnel, high speed railway tunnel, highway tunnel, metro tunnel, hydraulic tunnel and utility tunnel, and introduces some key and representative railway, highway and municipal tunnels projects, i.e. Muzhailing Tunnel on Lanzhou Chongqing Railway, Dangjinshan Tunnel on Dunhuang Golmud Railway, immersed tunnel of Hong Kong Zhuhai Macao Bridge, China Laos Railway Tunnel, Gaoligongshan Tunnel on Dali Ruili Railway, Yuelongmen Tunnel on Chengdu Lanzhou Railway, Tianshan Shengli Tunnel on Urumchi Yuli County High speed Railway, Shenzhen Zhongshan Passage, Su′ai Tunnel in Shantou, Ka Shuang Tunnel of Ertix River Water Diversion Project, Qianhai underground integrated hub in Shenzhen and underground integrated structure of Optics Valley Square in Wuhan. The author also introduces the development and progress in the fields of engineering investigation technology, BIM technology, mechanized and intelligent tunnel construction technology, shield/TBM manufacturing and remanufacturing technology, offshore immersed tube tunnel construction technology, non circular shield tunnel construction technology, tunnel big data platform construction technology, etc. According to the operation of series national strategies and planning such as Sichuan Tibet Railway, coordinated development of Beijing, Tianjin and Hebei, the Yangtze Economic belt, and the Guangdong Hong Kong Macao Greater Bay Area, following technical demands are proposed, namely, sea crossing tunnels, construction of complex and long distance tunnels, environmental protection technology for tunnel construction in ecologically vulnerable areas, development of large scale urban underground complexes, research and development of new materials in alpine environment, intelligent diagnosis of tunnel diseases and rapid repairs, intelligent disaster prevention of ultra long complicated tunnels and underground engineering, etc. Some thoughts and suggestions are put forward in two aspects of engineering construction management mode and mechanization supporting in combination with the development status of the industry.     

Prospect of Infrastructure Construction under "Belt and Road" Initiative（“一带一路”的基础设施建设前景）

The process of how the "Belt and Road" Initiative was brought up is studied and the major opportunities that the "Belt and Road" Intiative brings to China are described in this paper. The "Belt and Road" Intiative is very prospective. The important role of the infrastructure construction in the "Belt and Road" Intiative is shown. Two examples of the infrastructure construction under the "Belt and Road" strategy, i.e., China Nepal India Trans Himalaya Corridor and Kra Isthmus Canal in Thailand, are introduced. Finally, the challenges that China will face in the infrastructure construction under the "Belt and Road" Intiative and the rational countermeasures are described.     

Main Construction Technical Difficulties and Solutions of  Shenzhen Chunfeng Tunnel（深圳春风隧道主要施工技术难题与解决方案）

Shenzhen Chunfeng Tunnel is one of the shield tunnels under construction with the largest diameter in mainland of China. The whole tunnel passes through the coastal composite stratum, with rock from broken to integral, and the strength of some sections reaches 173 MPa. The tunnel under crosses the railway, subway, bridge and multiple buildings closely in a complex and sensitive environment. Combining the stratum situation and characteristics of large diameter shield machine, the problems that will be faced during the construction process, including low rock breaking efficiency of shield machine, discharge stagnation and jamming of the chamber, settlement control in sensitive environment, and impact of large diameter shield segment floating, cracking and construction on urban traffic, are analyzed. Based on the engineering experience, the following solutions are proposed: a shield rock breaking efficiency solution for the complete extremely hard rock section, settlement control measures for adjacent buildings and structures of shield driven tunnels, solutions for jamming and discharge stagnation of large diameter slurry shield, comprehensive measures for prevention and control of shield segment floating and cracking, and a slag treatment plan for downtown areas. Chunfeng Tunnel tests the wisdom of Chinese builders with its tremendous volume and strict construction standards, and it also has certain reference significance for other similar projects.     

The Current Status and Some Problems of Slurry Shield in China（中国泥水盾构使用现状及若干问题）

For recent ten years, the slurry shield tunnelling technology has been widely used in major underneath river/ocean tunnels and urban metro constructions in China. With the gradual maturity of the slurry shield technology, especially the large diameter slurry shield technology, the numbers of projects and shield machines have been among the highest in the world. However, great challenges arise during the construction of the slurry shield projects under complex geological conditions, such as the stability of the excavation face, cutting tool abrasion, opening the chamber and repairing the machine, slurry circulation with slag, and remanufacturing of the shield. Therefore, it is necessary to investigate the development of slurry shield construction technology in China. Based on typical cases of slurry shield projects, this study analysed the main problems of the slurry shield in the construction process and summarised the current experiences and key technologies. Considering the actual situation of the slurry shield technology, this study clarifies its development direction in China, which is significant to promote the development of the slurry shield technology in the world.     

锦屏二级水电站深埋特大引水隧洞关键技术

Seven tunnels across Jinping Mountain are arranged for Jinping Ⅱ Hydropower Station, with a total length of about 120 km. Among them, four headrace tunnels have a length of 16.67 km, an excavated diameter of 12.4-14.6 m, and a cover depth of 1 500-2 000 m in general. The maximum cover depth is 2 525 m, and the maximum external water pressure is more than 10 MPa. The tunnels are featured by great length, great depth and large diameter. It is the largest and most difficult among the underground tunnel groups built or under construction in China and even the world. With complex hydrogeological conditions and special topographical conditions along the tunnels, many challenging problems, such as rock burst under high in situ stresses, groundwater inrush in karst strata and failure of loading bearing structure, were encountered during construction. A great amount of groundbreaking studies were carried out regarding these problems. The key technical problems during construction of extremely large and deep tunnels were solved successfully. Safe and rapid tunnel construction and stable operation were achieved. The hydropower station started operation in 2014 and has been in a safe and stable operation state. The successful construction of headrace tunnels of Jinping Ⅱ Hydropower Station can provide some experiences and reference for deep tunnel projects in the world.     

Study of Design and Construction Technology of Ultra large span Tunnel at Badaling Great Wall Station（八达岭长城站超大跨度隧道设计施工技术研究）

The large span transition section at Badaling Great Wall Station with a maximum excavation span of 32.7 m and an excavation area of 494.4 m2 is the traffic tunnel with the largest excavation span and excavation section area in the world, resulting in substantial construction difficulty and high safety risk. To ensure the construction safety of Badaling Great Wall Station, the support parameter design, a new excavation method, and the surrounding rock deformation control principle for tunnels with an ultra large section are studied. The study results show that: (1) According to the checking calculation, the support system had a safety factor of 1.16-2.46 during the construction period and 1.59-3.54 during the operation period, i.e., its engineering structure is safe and reliable. (2) The innovative triangle type excavation applied to the tunnel with an ultra large span and section has the advantages of a simple and clear method, safe and reliable structure, high applicability of mechanical equipment and high construction efficiency. (3) Depending on different surrounding rock classes and spans, the criteria for total deformation control of the large span transition section at Badaling Great Wall Station are as follows: in the case of class Ⅱ surrounding rock, the total settlement is 20-30 mm, and the total horizontal convergence is 15-20 mm; in the case of class Ⅲ surrounding rock, the total settlement is 30-40 mm, and the total horizontal convergence is 20-25 mm; in the case of class Ⅳ surrounding rock, the total settlement is 60-90 mm, and the total horizontal convergence is 40-55 mm; in the case of class Ⅴ surrounding rock, the total settlement is 130-190 mm, and the total horizontal convergence is 90-105 mm. (4) According to the numerical simulation, the innovative triangle type excavation method results in deformation that is mainly centralized in the tunnel arch making stage, accounting for approximately 95% of the total, followed by deformation in the side making stage, accounting for 4% of the total, with the smallest deformation only accounting for 1% in the inverted arch making stage.     

Key Technology of Overlength Pressure Tunnel in Water Supply Project in Central City of Jilin Province（吉林引松工程超长有压隧洞关键技术）

Water Supply Project in the Central City of Jilin Province is a large scale project which involves complex geological condition and high technical difficulties. In order to maximize the water delivery, the overlength pressure hydraulic tunnel is introduced. Based on detailed geological survey and other reliable technical references, this project can be treated as a demonstration in terms of how to lay large diameter TBM through a karst area with limestone. The in situ test is introduced to test the non bonded pre stress circumferential anchor tunnel structure and culvert structure when the water transmission engineering line crosses the shallow buried valley section. The Class Ⅰ and Class Ⅱ granite tunnels excavated by TBM is not aligned with saving project investment and speeding up construction progress. The BQ method is introduced to analyze the rock quality classification of long tunnels. There are not many domestic engineering examples of the above mentioned key technologies, and there are no mature theories and experiences to refer to. Based on theoretical research, numerical calculations, model tests, and productive in situ tests, those key technical problems of ultra long and pressurized tunnels are solved. This project has a great theoretical and engineering value.     

Some Key Technical Issues on Construction of Ultra long Deep buried Water Conveyance Tunnel under Complex Geological Conditions（复杂地质条件下跨流域调水超长深埋隧洞建设需研究的关键技术问题）

For the water conveyance tunnels in the long distance water diversion projects constructed or planned in China, most of them have to pass through mountain areas with complex geological conditions, due to the constraints of route selection. These tunnels might face engineering problems such as harsh natural environment, high seismic intensity and steep terrain, leading to difficulties in construction and high operational risks. In this paper, some key technical issues on the construction of ultra long deep buried water conveyance tunnels under complex geological conditions are summarized into 5 aspects, namely, (1) exploration and testing techniques for deep buried tunnels, (2) prediction and prevention for large deformation and rock burst in the surrounding rock masses, (3) failure mechanism and anti faulting techniques of the surrounding rock masses and lining for tunnels crossing active faults, (4) synergistic load bearing mechanism and life cycle design theory for rock support system of deep buried tunnels, (5) disaster treatment for deep and long tunnels such as prevention of high pressure water inrush. The scientific and technical problems to be solved and their development directions are pointed out, which can provide some reference for engineering construction of ultra long deep buried tunnels.     

Key Design Technologies for Cutter Replacing of Super large  Slurry Shield under Atmaspheric condition: Case Studies of Shantou Gulf Tunnel and Shenzhen Chunfeng Tunnel（超大直径泥水盾构常压换刀设计关键技术——以汕头海湾隧道及深圳春风隧道为例）

By analyzing the application cases of super large diameter shield machine in the world and taking China Shantou Gulf Tunnel and Shenzhen Chunfeng Tunnel construction for examples, the problems encountered in the research and development and construction are proposed and the key technologies to solve a series of problems, such as cutterhead maintenance and cutter changing technology under high soil and water pressure, boring in long fractured zone, are explored. More specifically, the technologies mainly involve cutterhead design, atmospheric cutter changing, main drive with telescopic and swinging function, reliable sealing system, anti blockage technique by applying double crushers, which are of great significance to the development and application of super large diameter shield machine.     

Design and Application of Double shield TBMs  for Urban Metro Tunnels（城市地铁双护盾TBM设计及应用）

With reference to the construction conditions and features of metro tunnels, the design features of double shield TBMs are analyzed and key issues to be considered and settled when a double shield TBMs is used for metro tunnel construction are proposed. The issues include cutterhead′s rock breaking capacity, small curve excavation, selection of backfill grouting technology and jamming prevention and release function in fault and fracture zone, etc., which all have a direct effect on the geological adaptability, tunnel lining quality and tunneling performance of double shield TBMs. Subsequently, the specific design and optimization scheme, which includes the design of cutterhead thick steel plates, tapered shield, monorail hoist and pea gravel backfill and cement slurry grouting, etc., are studied. The success of double shield TBMs in Shenzhen Metro project well proved its remarkable geological adaptability and advantages in efficient mechanized construction.     

Design Evaluation of Optics Valley Plaza Complex（光谷广场综合体方案设计论证）

The Optics Valley Plaza Complex is located in the middle part of Luoyu Cluster on the Luoyu Development Axis in East Lake Hi tech Development Zone in Wuhan. It is a significant node and channel linking the central downtown and East Lake National Independent Innovation Demonstration Zone. At present, the China′s rail transit construction and comprehensive development of urban underground space are in full bloom. By integrating the metro station and surrounding underground space, and the metro and ground and underground space, the urban area function and environment can be further improved. In this paper, the state of art and plan of the transportation of the Optics Valley Plaza are analyzed. The principle of "Guarantee the functional priority of the metro and build the most beautiful metro station" is regarded as the starting point; and the derivation process of the Optics Valley Plaza Complex scheme is summarized. The results can solve many design problems, i.e., spatial arrangement, traffic path organization and fire protection of the Complex in complicated conditions, and provide reference for similar projects in the future.     

Reflections on Construction of Bohai Bay Crossing Corridor（对兴建渤海海峡跨海通道有关问题的思考）

The author discusses the necessity and urgency of constructing the Bohai Bay Crossing Corridor from the following aspects such as the increasing traffic volume, the convenience of the transportation after the corridor is constructed, and the regional benefit brought by the corridor. As for the timing of the construction of the sea crossing corridor, the author thinks that as long as the national economic situation permits and relevant conditions are basically available, the preliminary work should be carried out as soon as possible so as to promote the early commencement of the construction. Regarding the proposal of building another coastal national highway/high speed railway along the Bohai Bay coast, the author puts forward his viewpoints. In the aspect of construction risks, the author thinks that the geological risks in the construction of the Bohai Bay Crossing Corridor are very difficult to be dealt with; therefore, strict and detailed risk assessment should be carried out, and effective safety measures should be taken to mitigate the risks. The author also briefly describes the technological advantages of the tunnel proposal selected for the Bohai Bay Crossing Corridor, and briefly analyzes some key technological issues in the tunnel construction. The author describes the construction scheme and construction period estimation for the sea crossing corridor in details. The author makes the following proposal are given: (1)the hard rock tunnel boring machine (TBM) assisted by the drilling and blasting method should be used for the construction of the long sea crossing tunnel of Bohai Bay Crossing Corridor; (2) a parallel service tunnel shall be arranged between the twin main tunnel tubes; (3) in Proposal 2, the diameters of the twin main tunnel tubes and the service tunnel should be 8.0 m and 55 m, respectively. The proposal has two optional solutions: Solution 1: The service tunnel ( 55 m) located between the main tunnel tubes will be constructed first; for the main tunnel tubes, the disassembled TBMs ( 8 m) and the backup gantries are assembled for tunneling after arriving at the main tunnel tubes through the service tunnel and the cross passage; Solution 2 (alternative): Tunneling with  55 m TBM is carried out; the  55 m TBM will be dismantled to pass through the cross passage, and then be re assembled after arriving at the main tunnel; the start section (180 m) of main tunnel tube will be formed by  55 m TBM before it is enlarged to  8 m by drilling and blasting method; or the cross passage is enlarged to a large curved space to allow the 5.5 m TBM passing throught without disassembly. Comparison and contrast will be made and the preferred solution will be adopted. According to the rough estimation on the construction period of the 125 km long sea crossing tunnel, the total construction period of "completed tunnel" will be about 19 years (including 5 years of detailed offshore investigation) in Solution 1.     

Innovation and Prospect of Key Technologies of Immersed Tunnels in China（中国沉管法隧道典型工程实例及技术创新与展望）

In this paper, the application status of foundation trench excavation and navigation channel dredging, dry dock construction, element precasting, element transport, element mooring, element immersion, joint treatment and foundation treatment of several typical immersed tunnels in China are introduced. And then the Honggu Immersed Tunnel in Nanchang and subsea tunnel of island tunnel project of Hong Kong Zhuhai Macao Bridge are taken as examples; and some innovations of key technologies, i.e. key construction technology, element transport and immersed technology, differential settlement control technology for element immersion, subsea connection technology, and subsea space development and subsea harbor construction technology, are summarized for river crossing and sea crossing immersed tunnels. Finally, the development trends of immersed tunnels are prospected based on new technologies and equipments from the aspects of prolongation of immersed tunnel, field breakthrough, urban construction promoting and traffic demand adding of cities along rivers and seas. The results can provide reference for construction and popularization of immersed tunnels.     

Innovation and Future Application of Mechanized and Intelligentized Construction Technology for High speed Railway Tunnels: A CaseStudy of Hubei Section on Zhengzhou Wanzhou High speed Railway（高速铁路隧道机械化修建技术创新与智能化建造展望——以郑万高速铁路湖北段为例）

To ensure the safe, rapid and high quality construction of Zhengzhou Wanzhou High speed Railway, a series of exploration and innovation of construction technology, structural design and information management under the condition of large scale mechanization is used in the whole construction process. The technology includes: （1）A set of advanced geological prediction, advanced pre reinforcement technology of excavation face, mechanized construction technology of primary support, wide waterproof board trolley operation technology and intelligentized full face lining trolley of large scale mechanized construction technology are formed. （2）A classification method of surrounding rock stability is established based on the mechanized construction technology, and the design parameters of the tunnel support structure are optimized under the guidance of New Austria Tunneling Method. （3）To realize informatized management of tunnel construction, the tunnel construction management system, construction information record system, construction safety management system, quality management system of concrete mixing station and quality credit evaluation system are established. Finally, on the basis of mechanized and informatized construction, exploration and outlook of the tunnel intelligentized construction technology are given from the aspects of the dynamic intelligentized design system of tunnel support system, the intelligentized robot construction technology of tunnel support system and the intelligentized monitoring system of tunnel structure, to promote China′s tunnel construction technology.