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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 Analysis of Tunnel Excavation Face in Permeable Stratum is a Key Technology in Shield Tunneling Construction. Considering the influence of effective support pressure and seepage force, the stability of tunnel excavation surface is analyzed. The former is based on the theory of limit equilibrium of soil stability. The latter calculates the tunnel opening under steady state groundwater flow by numerical analysis Dig near the surface of the head derived. The supporting pressure acting on the excavation face of the tunnel is composed of effective support pressure and penetration. The study found that groundwater seepage flow has a great impact on the stability of the excavation face of the tunnel and the supporting pressure for maintaining the stability limit of the excavation face is far greater than that of the groundwater without seepage. The result of theoretical analysis shows that the numerical simulation results of fluid-structure interaction are in good agreement with the experimental data, which proves the rationality and effectiveness of the theory and method in this paper.