中文摘要：

依托江苏江阴澄江西路过江隧道工程，对大直径泥水盾构施工对软土地层的扰动影响进行研究。主要研究方法及结论如下：1）对盾构掘进中地表纵向沉降规律进行探讨，在前人研究的基础上对引起土体扰动的4个阶段进行验证，得出软土地层施工中不同阶段对土体扰动程度的比例。2）使用ABAQUS有限元软件，建立三维有限元模型，在数值计算中考虑土体非线性变形。通过数值模拟可知，横、纵、竖向位移趋势符合工程实况，最大沉降量与实测数据比较接近；增大上部土层的E,c,φ值町以有效地减小软土地层的沉降量，降低盾构施工对土体的扰动影响。从而论证了通过对土体表层注浆加固可以达到减小沉降，降低土体扰动的目的。

英文摘要：

The disturbance to soft ground caused by large diameter slurry shield boring is studied, with Chengjiang West Road river-crossing tunnel in Jiangyi city, Jiangsu province as an example. The main contents and conclusions of the study are as follows ： 1 ） The rules of the longitudinal ground surface settlement caused by shield tunneling are studied, the four stages of the ground disturbance caused by shield tunnel are verified on basis of previous study results, and the percentages of the ground disturbance caused by shield tunneling in different stages are obtained. 2） 3D finite element model is established by means of ABAQUS finite element software and the nonlinear deformation of the ground is consid- ered in the numerical calculation. The numerical simulation shows that the trends of the transverse, longitudinal and ver- tical displacement coincides with the actual conditions of the works, and the maximum settlement value is close to the measured data; the settlement of the soft ground can be effectively reduced by increasing the values of E, c and φ of up-per soil layers, and in turn the disturbance to the ground caused by shield tunneling can be reduced. It is concluded that the settlement and disturbance of the ground can be reduced by means of grouting reinforcement of the surface layers of the ground.