Technical Challenges of Super-Long Mountainous Tunnels at Great Depth北大核心CSCD

There are various technical challenges faced by the super-long mountainous tunnelling at great depth,and new requirements are arising in terms of the geological investigation, construction period, special geological condi-tions (high ground stress, high geothermal temperature and high-pressure groundwater), disaster prevention & evacua-tion, and social development. Based on an analysis of above mentioned technical challenges, this paper presents tech-nical views on solutions to those challenges and specifies the objectives of related technical development in the fu-ture. To improve the validity and accuracy of the geophysical prospecting, it is necessary to not only increase the accu-racy of ground geophysical exploration at great depth, but also carry out research on the application of such tech-niques to tunnel investigation as airborne geophysical prospecting and HDD combined with borehole geophysical ex-ploration. To maximize the benefits of tunnel projects, it is of importance that more attention should be paid to thoseissues relating to the tunnel design concept, such as the multiple functions of tunnel projects, energy saving andemission reduction, and environmental protection. As for tunnel support theories, in addition to optimizing the currenttheories, some unconventionally new lining theories need to be studied to make the tunnel structure more durable andeconomical. It is also suggested that, in terms of construction, sustained efforts should be put into the development ofinnovative tunnelling techniques for a better, faster and more economical tunnelling, as well as the realization of intel-ligent mechanized tunnelling. When it comes to operation, it is obvious that there will be a trend towards intelligent maintenance in the future. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved.     

带有弹性索的潮流能电站系泊系统的设计及特性

漂浮式电站潮流能发电机组依托于浮式载体,其系泊系统关系着潮流能电站的安全运行与生存。关于载体系泊系统的研究,目前主要集中在海洋钻井平台方面,而关于以潮流电站为代表的浅水系泊的开发研究相对较少。本文基于漂浮式潮流能电站,设计开发了一套带有弹性索的系泊系统,以悬链线理论为基础,分别分析了系泊系统中加入的弹性索长度及不同水深下对系泊系统的影响。研究发现,当工作水深小于60m的浅水海域时,对于系泊张力的作用显著,张力的最大值可以减少37%,具有极大的工程应用前景。     

浅埋、富水黄土隧道塌方成因及预防对策

详细地介绍了黄土的工程地质特性,并有针对性地提出了浅埋、富水黄土隧道预防塌方的施工技术对策,为今后类似工程的施工提供参考。     

澜沧江景洪大砂坝浅滩成因分析与整治原则

简述景洪大砂坝水道的概况并计算出输砂量和造床流量,分析景洪大砂坝浅滩的成因和演变趋势,并提出相应的整治原则供相关人员参考.     

石安高速公路罩面结构选型研究

聚脂纤维改性沥青混凝土、美国工程兵旋转压实仪（GTM）沥青混合料设计标准和方法,虽然各有优点,但是对于目前我省的施工工艺、施工经验,在较薄的罩面结构中使用仍存在一些问题,因此在今后的一定时期内仍需要不断改进施工工艺．摸索经验。     

Evaluating the maneuverability of a new type of self-propelled barge

A new type of self-propelled barge was designed specifically for use on the Chishui River. This paper presents experimental results of its performance from tests in water of different depths,while bearing different loads. For test purposes,one of the best self-propelled barges from the Chishui River was used as a performance reference. The comparison showed that the new design has better maneuvering performance.     

地下结构穿越道路保通临时钢结构盖板标准化设计与施工技术

地下结构穿越运营道路,引起道路沉降,严重影响行车安全性及舒适性。为道路保通,设置临时钢结构盖板在市政工程中应用广泛。北京市某地铁穿越施工引起道路沉降,因而采取设置临时钢结构盖板措施,以该工程临时钢结构盖板的设计及施工为应用案例,提出了道路沉降钢结构盖板措施标准化的设计与施工技术。经验算,结构的最大应力及最大挠度均符合规范要求,地铁穿越道路引起沉降问题得到有效解决。     

发动机悬置系统刚度的研究

通过研究发现,发动机悬置系统对车辆的NVH表现影响比较大,文章通过调整整车悬置长度、悬置强度、正时罩盖(又称发动机前罩盖、正时链条盖)强度、悬置螺栓安装点等结构参数,对悬置系统进行仿真计算,提高发动机悬置系统的刚度,优化发动机NVH性能,减轻产品的重量,从而达到最优化设计。     

广州地铁超长水平冻结施工设计

广州地铁天河客运站站后折返线采用矿山法冻结帷幕施工,即"水平孔冻结加固土体,隧道内开挖构筑"的施工方法,水平超长距(大于100 m)、大断面(直径大于10 m),在国内、外均无此工程记录.主要介绍水平冻结长度,冻结帷幕(冻结壁),水平冻结孔布置,测温孔、水文孔、卸压孔布置、冻结需冷量施工等设计及冻结时间估计,阐明钻孔施工和冻结制冷施工的主要技术措施、冻胀及融沉预防措施等.     

缅甸蒂洛瓦船厂岩土工程特征分析

对缅甸蒂洛瓦船厂的地质构造及其稳定性、地基土的构成及其物理力学性质、地基与基础的型式及存在问题进行探讨,并与天津新港软土的性质进行类比。通过比较分析和验证,对不同规范的差异和境外项目采用中国规范的适用性提出见解。