岩溶地层地铁盾构施工引起地下管线变形规律分析

Analysis of underground pipeline deformation caused by shield tunneling in karst strata

岩溶地层修建地下工程往往会遇到岩溶溶洞等不良地质条件,严重影响了工程建设成效和安全。虽然采用注浆加固方法填充了部分岩溶溶洞起到了地层稳定性加固作用,但是地铁盾构施工依旧对于地层之中的既有结构物产生影响,严重者易造成结构沉降开裂。为此,本文依托深圳地铁16号线穿越岩溶地层段龙南-龙东村盾构区间工程,针对盾构侧穿地下管线引起结构变形问题,采用现场监测方法,研究岩溶地层地铁盾构侧穿地下管线过程中管线结构的变形规律与防控方法,为类似工程提出参考建议。

Adverse geological conditions such as karst caves are often encountered in underground engineering construction in karst strata,which seriously affects the effectiveness and safety of engineering construction.Although the grouting reinforcement method is used to fill part of the karst cave,which plays a role in strengthening the stability of the stratum,the subway shield construction still has an impact on the existing structures in the stratum,which is easy to cause the settlement and cracking of the structure.Therefore,based on the shield project of Longnan Longdong village of Shenzhen metro line 16 passing through karst strata,this paper studies the deformation law and prevention and control method of pipeline structure in the process of shield passing through underground pipeline in karst strata by using on-site monitoring method,aiming at the problem of structural deformation caused by shield passing through underground pipeline,and puts forward reference suggestions for similar projects.