桩间土绕桩滑动破坏模式下路堤稳定性分析  

Analyzing stability of embankment considering failure mode of soil between piles

作　　者：郑俊杰[1] 谢明星[1] 曹文昭[1] 张军[1] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2012年第12期98-102,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50978112);教育部留学回国人员科研启动基金资助项目(20091341);山西省交通科技建设资助项目(11-2-17)

摘　　要：针对刚性桩加固软弱地基上路堤稳定性现有计算方法存在的不足,提出了考虑路堤桩间土绕桩滑动破坏模式.基于Tomio土拱效应理论和Bishop圆弧滑动法推导出了该破坏模式下路堤稳定性计算方法,并将该方法与传统复合抗剪强度法对路堤稳定性进行对比.结果表明:传统复合抗剪强度法不能反映桩间土绕桩滑动破坏机理,高估了软弱地基上路堤的稳定性;通过对不同桩体抗剪承载力工况下路堤稳定性分析得到桩体临界抗剪承载力,当桩体抗剪承载力大于临界值时应考虑桩间土绕桩滑动破坏模式对路堤稳定性的影响.To study the deficiency of present analysis methods of the embankment stability supported by rigid pile,a failure mode of soil between pile was proposed.Based on Tomio soil arching effect and Bishop circular sliding method,the method to calculate the embankment stability under this failure mode was deduced.The proposed method was compared with the calculation results of the conventional method.The results show that the conventional method cannot reflect the failure mode of soil between piles,and can overestimate the stability of embankment.By comparing the stability of embankment under the different cases,the critical shear resistance was obtained,and the effects of failure mode of soil between piles on the stability of embankment should be considered when shear resistance is greater than the critical shear resistance.

关 键 词：软弱地基 刚性桩 BISHOP法 稳定性 破坏模式 土拱效应 

分 类 号：TU447[建筑科学—岩土工程]