土工基础

›› 2017, Vol. 31 ›› Issue (6): 709-711.

• 工程实录 • 上一篇    下一篇

基于有限元的土洞稳定性分析及地基处理

胡爽子   

  1. （中铁隧道局集团有限公司勘察设计研究院，广州 511400）
  • 收稿日期:2016-08-09 修回日期:2016-09-21 出版日期:2017-12-20 发布日期:2017-12-27
  • 作者简介:胡爽子（1990—），男，工程师，硕士，研究方向为岩土工程设计与施工。

Stability Analysis of Soil Cave in Finite Element Method and Foundation Treatment

HU Shuangzi   

  1. (Survey, Design and Research Institute, China Railway Tunnel Group Co., Ltd., Guangzhou 511400)
  • Received:2016-08-09 Revised:2016-09-21 Online:2017-12-20 Published:2017-12-27

摘要： 目前国内外关于土洞稳定性的分析方法发展较快，已经可以采用有限元强度折减法来进行分析计算。基于PLAXIS有限元程序采用有限元强度折减法，进行了土洞在不考虑地下水及渗流作用下的稳定性分析，并采用Drumm,E.C.等总结出的有限元方法进行了验算。经对比，PLAXIS有限元程序对于土洞稳定性分析有较好的适用性，而且弥补了Drumm,E.C.等的有限元方法中不能分析外加超载的不足，能够较全面的分析土洞在多工况下的稳定性，可为隐伏土洞处理提供理论依据。

关键词: 土洞, 稳定性, PLAXIS, 有限元强度折减法, 地基处理

Abstract: The analysis methods on the stability of soil cavities have developed rapidly at both domestically and abroad. The Finite Element Method (FEM) with Strength Reduction Method is frequently used in the stability evaluation of soil cavities. This paper presents the analytical results of FEM with Strength Reduction Method by using PLAXIS on the stability of a soil cavity without considering the effect of groundwater and seepage. The results were also examined by the stability charts developed by Drumm et al through FEM. The results indicate that the FEM evaluation of soil cavity stability with PLAXIS is appropriate. The approach used also improved the charts developed by Drumm et al since no surcharge was considered in the charts.

Key words: Soil Cavities, Stability Analysis, PLAXIS Software, Finite Element Method with Strength Reduction Method, Soil Improvement