基于有限元法对深基坑围护桩水平位移的分析

Analysis on the Horizontal Displacement of Bracing Pile for Deep Excavation Based on General Purpose FE Software

摘要:

利用有限单元法，通过有限元程序来进行模拟计算。将所研究问题假定为平面应变问题；岩土体为理想弹塑性模型，采用平面四节点等参单元，遵循适于岩土的Drucker-Prager屈服准则；桩与岩土体之间通过设置接触单元来模拟基坑围护桩桩与岩土体的相互作用，重点分析建筑物与基坑的不同距离、基坑围护桩的刚度变化和围护桩底端土体物理力学参数变化时基坑开挖对围护桩变形的影响。

Abstract:

This paper studies the deformation of deep excavation in mountainous area of Guizhou. The finite element method and large finite element method program ANSYS10.0 are used to simulate and analyze excavation and adjacent buildings interaction. In this model, the study issue has been presumed as plane strain. Seemly, the soil is seemed as ideal elastoplastic model, and four-node equal-parameter element is used abiding by Drucker-Prager yield criteria of soil. At the same time, contact element is set between pile and soil to simulate the interaction. What is more, this paper has analyzed the effect of bracing pile deformation by excavating with different distances between excavation and adjacent buildings, the different stiffness of bracing system and physical mechanics parameter variation of soil at the pile bottom.