盾构法隧道引起的地表变形分析

在分析盾构法隧道引起地表变形的原因的基础上，将盾尾空隙的大小、注浆充填的程序、隧道壁面土体受扰动的程度和范围等对地层位移有着重要影响，而在实际工程中又难于分别量化的因素，概化为一均质、等厚的等代层，分析了地表变形对等代层参数的敏感性。在有实测位移的情况下，可运用位移反分析法较准确地获取等代层的参数。实例分析表明，这种处理方法用于实际工程中能取得合理的、令人满意的结果。

ANALYSIS ON THREE-DIMENSIONAL GROUND SURFACE DEFORMATIONS DUE TO SHIELD TUNNEL

Based on understanding the reason of ground surface deformations resulting from the construction of shield tunnel,the effects of the shield tail void,the degree of filling grout and the disturbance of soil around the tunnel on the ground deformations are generalized as an equivalent circle zone,and the degree of sensitivity of the surface deformation to its parameters is also discussed. With the measured data,the parameters of equivalent circle zone can be obtained by back analysis of soil displacement. The case study shows that the proposed method is reasonable and satisfying in actual engineering.