地下工程开挖土体硬化模型

Hardening-soil-model for underground construction

为在地下工程开挖数值模拟中考虑土体的应力路径相关性和初始各向异性,研制了一种土体硬化模型,将横观各向同性弹性植入该模型。利用ABAQUS用户材料子程序UMAT,开发了不带帽盖的土体硬化模型的接口程序。应用该模型对某地铁隧道开挖进行数值模拟。模拟结果和实测数据的对比表明:利用该模型可以得到较为符合实际的地层竖向和水平变形规律。

This paper proposed a hardening soil-model combined with transverse isotropie elasticity to numerically simulate underground construction excavation with stress path dependency and inherent anisotropic behavior of soil. Using UMAT in ABAQUS, an interface program for the hardening-soil-model without cap was developed. Comparing the tunneling simulation with field measurements shows that both vertical and horizontal calculated deformations agree well with the measured values.