将断裂理论引进基坑开挖的有限元分析中

断裂力学是近年来新兴的一门综合学科,本文将断裂力学的基本原理与土的强度理论相结合,采用适用于土体的抗裂强度理论,建立开裂后土体的本构关系,分析土体开裂对基坑支护结构的影响。开发了弹塑性有限元程序。并将程序的计算结果与模型实验的结果进行了对比。

Using Fracture Theory in Finite Element Analysis of Stability of Retaining Structure

The fracture theory ofsoil is a new developing problem in recent years. In this paper, the basic principle offracture mechanic s and the strength theory of soil are combined, and the soil-crackingstrength t heory is adopted in building a constitutive relation of carcked soils. In orderto use such theory and to analyze how the cracked soils effect on retaining strucu re, wedeveloped an elastoplastic finite element program. Finally, the calculati on results fromthis program are compared with that measured in the model t esting.