盾构隧道壁后注浆压力对地表沉降变形影响

Influence of Grouting Pressure Behind Shield Tunnel Wall on Surface Settlement and Deformation

本文利用数值分析法对比太原市轨道交通2号线一期工程现场与计算的地表沉降变形规律,指出了不同大小的注浆压力及分布模式下隧道地表沉降变形规律,以期为此后的盾构隧道施工提供更多的借鉴依据。通过分析可知,太原市轨道交通2号线一期工程现场地表横向沉降规律符合高斯函数分布规律,与非均匀注浆压力相比,均匀注浆压力可以减少地表的沉降变形量,且注浆压力与沉降变形量也存在线性关系,随着压力的增大,变形量逐渐减小,当达到一定数值时便会出现地表隆起问题。

In this paper,the numerical analysis method is used to compare the ground settlement and deformation law of Taiyuan Rail Transit Line 2 phase I project,and the tunnel surface settlement deformation law under different grouting pressure and distribution mode are pointed out,so as to provide more reference for the shield tunnel construction in the future.Through the analysis,it can be seen that the law of surface transverse settlement of Taiyuan Rail Transit Line 2 phase I project conforms to the distribution law of Gaussian function.Compared with the non-uniform grouting pressure,the uniform grouting pressure can reduce the surface settlement deformation.And there is a linear relationship between grouting pressure and settlement deformation.With the increase of pressure,the deformation decreases gradually.When the pressure reaches a certain value,the surface heave will occur.