城区近距离多孔隧道施工关键技术研究  

Study of Key Construction Technologies for Multiple Closely Spaced Tunnels in an Urban Area

作　　者：吉小明[1] 唐伟才[1] 谭文[2] 王炳华 

机构地区：[1]广东工业大学土木与交通工程学院,广州510006 [2]广州市地下铁道总公司,广州510030 [3]中铁三局集团有限公司,太原030001

出　　处：《现代隧道技术》2012年第6期23-31,共9页Modern Tunnelling Technology

基　　金：广州地铁总公司资助项目(TJ5ZT008);广东省岩土工程重点学科资助课题

摘　　要：文章以广州地铁5、6号线区庄换乘地铁车站交叠段近接4孔隧道施工为背景,分析了近接隧道施工过程中地层应力重分布特性,对近接隧道施工中先后施工隧道间的围岩稳定性、隧道支护结构的内力、变形相互影响进行了分析研究,提出了相应的施工安全控制指标;对4孔近接隧道施工中的关键施工力学问题进行了三维模拟计算分析,提出了合理的4孔近接隧道同时施工关键技术方案。研究结果表明,在该地层条件下只要采取合理的地层加固措施和隧道支护方案,合理控制平行近接隧道、空间交叠隧道间的错距,则多孔近接隧道同时施工方案是可行和安全的。Considering the four closely Guangzhou Metro lines 5 and 6, the behavi spaced, overlapping tunnels of the Ouzhuang interchange station of the or of stress redistribution of the surrounding rock was studied and the rela- tionships between rock stability, internal force of the tunnel support, and support deformation were analyzed. Addi-tionally, a corresponding index for safe construction was proposed and 3D simulation and mechanical calculations were performed regarding the key construction techniques for closely spaced tunnels. This paper introduces a scheme for the simultaneous construction of four tunnels. The results indicate that multiple tunnels constructed at the same time are secure and feasible so long as reasonable stratum reinforcement measures are taken, a tunnel support scheme is adopted, and spacing among the closely spaced multiple tunnels is sufficient.

关 键 词：多孔隧道 近接施工 安全控制 应力重分布 数值模拟 短台阶法 注浆加固 

分 类 号：U231.4[交通运输工程—道路与铁道工程] U456.1[建筑科学—桥梁与隧道工程]