城市地铁盾构隧道与前方断层破碎带临界安全距离研究

立足于城市地铁盾构施工掘进过程，旨在预防地下岩溶发育并存在断层破碎带的城市中地铁盾构施工面临的突水涌泥灾害风险。针对城市地铁建设过程中盾构隧道前方断层破碎带临界安全距离问题，研究不同类型与直径的盾构机刀盘、不同厚度与水压的前方断层破碎带对临界安全距离的影响规律与响应敏感程度。利用COMSOL Multiphysics软件流固耦合方法模拟盾构推进过程与突水发生时刻。综合三维有限元数值模拟结果，利用SPSS Statistics软件中的多元回归功能得到盾构隧道前方断层破碎带临界安全距离公式。研究结果对于断层破碎带发育及地下水丰富的城市地铁盾构开挖工程具有一定的施工指导意义。

Study on the Critical Safety Distance between Urban Subway Shield Tunnel and the Front Fault Fracture Zone

Based on the tunneling process of urban subway shield construction, the aim is to prevent the risk of water and mud inrush faced by subway shield construction in cities where underground Karst has developed and there is a fault fracture zone. Aiming at the critical safety distance of the fault fracture belt in front of the shield tunnel during the construction of the urban subway, the influence law and response sensitivity of different types and diameters of shield machine cutterheads, and different thicknesses and water pressures of the fault fracture belt on the critical safety distance are studied .The COMSOL Multiphysics software fluid-structure interaction method is used to simulate the shield propulsion process and the moment of water inrush. Based on the 3D finite element numerical simulation results, the critical safety distance formula of the fault fracture zone in front of the shield tunnel is obtained by using the multiple regression function in SPSS Statistics software. The results of this paper have certain construction guidance significance for the development of fault fracture zones and the excavation of urban subway shield tunnels with abundant groundwater.