超孔隙水压力影响的土压平衡盾构开挖面稳定特性

针对土压平衡盾构掘进过程中开挖面稳定控制对周边环境影响的问题,通过原位监测手段得到盾构开挖面上超孔隙水压力和土压力增量的发展和分布情况,在此基础上进行考虑流固耦合的数值分析,得到考虑超孔隙水压力影响情况下欠支护状态和超支护状态的开挖面稳定特性.利用数值模型进行参数分析,研究土体渗透系数以及盾构停推时间对于开挖面稳定的影响,为实际施工提供有益的参考.

Face Stability Analysis of Tunnels with Consideration of the Influence of Excess Pore Pressures

Abstract： During the earth pressure balance (EPB) shield tunneling, face stability is very important for controlling the impact on the environment. Field measurement was used to study the development and distribution of the excess pore pressure and earth pressure increment. Based on the monitored data, the fluidsolid coupling numerical model was used to analyze the face stability of tunnels with consideration of the influence of excess pore pressures in loading and unloading conditions. Subsequently, parametric analysis was executed to study the influence of the soil permeability coefficient and shield stopping time on face stability.