基于HSS和M-C模型对地铁变形特性分析

HSS and M-C Model Based Analysis of Deformation Characteristics of Subway

以天津某基坑为研究对象,运用PLAXIS3D数值分析软件,分别基于HSS模型和Mohr-Coulomb模型分析基坑开挖对临近地铁隧道及车站变形的影响,并与实测数据进行对比分析。结果表明:基坑卸载坑底回弹是地铁隧道及车站变形的主要诱因;HSS模型考虑了土体硬化及小应变,能够更真实地反映土体变形,计算结果与实测数据相吻合;Mohr-Coulomb模型低估坑底回弹模量,计算结果高于实测结果一倍左右。

With PLAXIS3D numerical analysis software HSS and Mohr-Coulomb model, the foundation pit in Tianjin was taken as the object to analyze the influence of the foundation pit excavation on the deformation of subway tunnel and adjacent station, and then to compare with the measured data. The results show that the unloading rebound at the bottom of foundation pit is the main factor inducing the deformation of subway tunnel and station;HSS model, with the consideration of soil hardening and small strain, may reflect the soil deformation truly and has the calculation result consistent with the measured data;Mohr-Coulomb model underestimates the bottom rebound modulus and has the calculation result double the measured data approximately.