采用不同本构模型对盾构施工引起地层位移的数值模拟研究

为揭示莫尔-库伦模型和修正剑桥模型在模拟盾构施工引起地层位移的不同，以能够反映施工工况的地层损失率为控制参数，采用2种模型模拟盾构施工引起的地层位移，从机制上分析2种模型计算结果的不同，并与Peck公式的计算结果和实测数据进行对比。主要结论如下： 1）莫尔-库伦模型计算的隧道中心的最大沉降大于实测数据和Peck公式的计算结果，计算的远离隧道中心处的位移为回弹性质。 2）修正剑桥模型计算的最大沉降与实测数据和Peck公式的计算结果基本吻合，但计算的沉降槽宽度偏大。

Numerical Simulation of Ground Settlement Induced by Shield Tunneling Using Different Constitutive Models

Mohr Coulomb model and modified Cam Clay model are used to simulate the ground displacement induced by shield tunneling, with the ground loss ratio as the control parameter, so as to reveal the differences between the calculation results on basis of these two models. In the paper, the differences between the calculation results on basis of these two models are analyzed. Furthermore, the calculation results on basis of these two models are compared with those on basis of Peck formula and the measured data. Conclusions drawn are as follows： 1） The maximum settlement at the tunnel center line calculated on basis of Mohr Coulomb model is larger than that calculated on basis of Peck formula and the measured data. The calculated displacement far away from the tunnel center line displays rebound property. 2） The maximum settlement calculated on basis of modified Cam Clay model agrees with that calculated on basis of Peck formula and the measured data, but the width of the settlement trough calculated is slightly larger.