深基坑土钉支护的有限元数值模拟及稳定性分析.pdfVIP

第29 卷第4 期 岩 土 力 学 Vol.29 No. 4 2008 年4 月 Rock and Soil Mechanics Apr. 2008 文章编号：1000－7598 －(2008) 04 －983 －06 深基坑土钉支护的有限元数值模拟及稳定性分析 1 2 赵 杰 ，邵龙潭 ( 1. 大连理工大学土木水利学院，大连 116024 ；2. 大连理工大学工程力学系，大连 116024 ) 摘 要：在平面应变条件下，对土钉支护的基坑进行了有限元数值模拟，在此基础上采用有限元稳定分析方法评价基坑的稳 定性。研究了土钉拉力及基坑变形的变化规律，土钉长度及布置方式变化对基坑变形和稳定性的影响。结果表明，当土钉足 够长时，基坑的潜在滑动面与最大拉力作用点连线位置通常是一致的。 关 键 词：土钉；有限元；变形；稳定性；安全系数 中图分类号：TB 115 文献标识码：A Numerical simulation and stability analysis of soil nailing support for deep foundation pit by FEM 1 2 ZHAO Jie , SHAO Long-tan (1.School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China; 2. Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024, Chian ) Abstract: Under the condition of plane strain, a 2D elastoplastic FEM is used to analyze the behavior of a soil nailing support for deep foundation pit; and stability method based on slip surface FE stress is applied to evaluate the stability of the soil-nailed wall. The variations of tensile force of soil nails and deformation of foundation pit are studied. The influence of different lengths and layouts of soil nails on stability and deformation of foundation pit is also analyzed. The result indicates that the potential slip surface of foundation pit is consistent with the position of maximal tensile force when the soil nails are long enough. Key words: soil nailing; finite element analysis; deformation; stability; factor of safety 力的不同假设和简化，不能考虑土钉的变形