渗透力对隧道开挖面稳定性影响分析  

Face stability analysis of tunnels with consideration of seepage force

作　　者：高健[1] 张义同[1] 乔金丽[1] 

机构地区：[1]天津大学机械工程学院,天津300072

出　　处：《岩土工程学报》2009年第10期1547-1553,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家重点基础研究发展计划(973计划)项目(2007CB714001)

摘　　要：强透水地层中隧道开挖面稳定分析是盾构掘进施工中一项关键技术。综合考虑有效支护压力和渗透力的影响,对隧道开挖面稳定性进行了分析,前者基于土体稳定的极限平衡理论计算结果,后者通过数值分析方法计算稳态地下水流条件下隧道开挖面附近水头分布推导得出。作用在隧道开挖面的支护压力由有效支护压力和渗透力共同构成。研究发现,地下水渗流对隧道开挖面稳定产生极大影响,维持开挖面稳定极限支护压力远大于无地下水渗流时的情况。理论分析结果、流固耦合数值模拟结果与工程实测数据取得较好的一致,验证了本文理论与方法的合理性和有效性。Stability of tunnel face under high permeable layers is a very important issue in tunnel engineering. In this study the influence of both effective support pressure and seepage pressure on the stability of tunnel face is considered, the former is evaluated with the aid of limit theorem and limit equilibrium analysis, and the latter is obtained by means of numerical analysis of head distribution. The support pressure to keep the stability of tunnel face is equal to the sum of the effective support pressure and the seepage pressure. It is found that the groundwater play a crucial role in the instability of tunnel face, the minimum support pressure to keep the stability of tunnel face with seepage is much greater than the one without seepage. The comparison between the analytical results and measured data in engineering shows that the method suggested in this paper is more effective than the existing ones.

关 键 词：开挖面稳定 极限平衡 渗透力 流固耦合 

分 类 号：U452[建筑科学—桥梁与隧道工程]