广州轨道交通五号线盾构施工关键技术

研究目的：解决广州轨道交通五号线盾构施工面临的诸多难题，总结在复合地层中盾构施工的若干经验，为类似工程提供借鉴。研究方法：通过工程类比、现场试验及监测等手段，对盾构施工相关工法、材料及技术等进行了引进、研究和实践。研究结果：广州地铁五号线大坦沙南-中山八站盾构区间首次成功应用了盾构始发SEW工法，并完成江中超浅埋泥水盾构过江掘进；火车站-小北站盾构区间顺利通过溶洞群，填补该项国内空白；动物园站-杨箕站盾构区间超小曲线半径掘进技术实现了新的突破；车陂南站-东圃站盾构区间首次成功应用了TAC高分子聚合物，辅助盾构顺利通过浅埋砂层。研究结论：广州地铁五号线盾构施工关键技术，有效控制了土体稳定和变形，在环境岩土工程问题防治方面取得了较大进步。

Key Construction Technologies in Shield Tunneling of Guangzhou Metro Line 5

Research purposes: The research solves many difficult problems in the shield tunneling construction of Guangzhou metro line 5,and summarizes some experiences on shield tunneling technology in compound stratum,hoping that it may furnish reference for similar project construction.Research methods:The introduction,research and practice on the shield construction methods,the material and technology of shield tunneling construction are carried on by engineering analogy,field test and monitoring.Research results:Datanshanan-Zhongshanba part of Guangzhou metro line 5 has applied successfully the SEW shield launching method for the first time,and the slurry shield has completed the ultro-shallow tunneling across the river.The shield has crossed through karst caves smoothy distributed in Huochezhan-Xiaobeizhan part,and it has filled in this blank of the domestic engineering practice.The shiled tunneling technology in ultra Small Radius Curves in Dongwuyuanzhan-Yangjizhan part has realized the new breakthrough.Chebeinanzhan-Dongpuzhan part has applied successfully the TAC high molecular polymer for the first time,and the shield has crossed the shallow Sand Strata smoothly.Research conclusions:Some key technologies are implemented in the shield tunneling construction of Guangzhou metro line 5,soil environment stability and deformation is controlled more effectively,great progress on countermeasures of environmental geotechnical problems is also obtained,many domestic records in the shield tunneling construction are created.It promotes the development of the shield construction technology in the compound strata.