富水地层重叠隧道施工结构及地层变形分析  

Analysis on Deformation of Tunnel Structure and Ground Induced by Construction of Overlapping Tunnels in Water-rich Strata

作　　者：刘鹏[1] 刘维[2] 

机构地区：[1]中铁隧道集团三处有限公司,广东深圳518052 [2]浙江大学软弱土与环境土工教育部重点实验室,杭州310058

出　　处：《隧道建设》2012年第3期323-327,共5页Tunnel Construction

基　　金：国家自然科学基金资助项目(51179168)

摘　　要：为解决重叠隧道在富水地层中施工时,开挖应力释放引起地层变形和渗流引起工后变形对隧道结构及周边建筑造成的不利影响,以深圳地铁某区段重叠隧道矿山法施工为背景,采用现场监测的方法对重叠隧道富水地层施工中隧道结构及周边土体的变形规律进行分析。研究表明,下洞施工沉降和工后沉降均较大,下洞变形稳定后施工上洞有利于上洞结构的稳定性,并验证了重叠隧道采用"先下后上"的施工顺序有利于保证结构的整体稳定性。在地下水渗流作用下,重叠隧道中段出现了地表沉降大于拱顶沉降的现象,同时造成下线隧道工后沉降极大,渗流和开挖应力释放是地层变形的主要原因。研究结果对同类地层条件下的重叠隧道施工具有参考价值。In the construction of overlapping tunnels in water-rich strata, the ground deformation induced by stress relea- sing and water seepage has adverse impact on the tunnel structure and the surrounding buildings. The ground deforma- tion rules are analyzed, with the construction of a mined overlapping tunnel of Shenzhen Metro as an example. The re- suits show that： 1 ） The lower tunnel should be built before the upper tunnel, which is favorable for the stability of the tunnel structure; 2） The main causes for the ground deformation are the ground water seepage and stress releasing occur- ring after tunnel excavation.

关 键 词：重叠隧道 富水地层 监测 地层变形 

分 类 号：U456.31[建筑科学—桥梁与隧道工程]