条形基础下成层砂土地基破坏机理及承载力计算  

Failure mechanism analysis and bearing capacity calculation of layered sand ground base under strip foundation

作　　者：陈华 沈军辉[2] CHEN Hua;SHEN Junhui(Sichuan Traffic Investigation and Design Institute Co.,Ltd.,Chengdu 610059,China;State Key Laboratory for Prevention and Control of Geological Disasters and Geological Environment Protection,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]四川省交通勘察设计研究院有限公司,四川成都610059 [2]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059

出　　处：《人民长江》2022年第8期179-185,共7页Yangtze River

基　　金：国家自然科学基金项目(41572308)。

摘　　要：为改进现有对条形基础下成层砂土地基破坏机理的认识和相应极限承载力计算方法的不足,采用有限元塑性极限分析方法对成层砂土地基进行计算,得到极限荷载的上下限,并分析了地基破坏机理随几何参数与土体力学参数的变化规律。将所得结果与以往成果对比并结合理论分析方法给出了条形基础下地基的3种破坏模式及其对应的地基极限承载力计算方法。研究结果表明,条形基础下成层地基的破坏机理可以分为冲剪破坏、过渡破坏和一般剪切破坏,过渡破坏模式的地基极限承载力计算方法具有较强的实用性,可用于实际工程求解计算。In order to clarify the failure mechanism and ultimate bearing capacity calculation method of layered sand ground base under strip foundation,the finite element plastic limit analysis method is used to calculate and analyze the layered sand ground base.Through calculation we obtain the upper and lower limit of the ultimate bearing capacity,and analyze varying laws of failure mechanism of ground base with geometric parameters of foundation and mechanical parameters of ground soil.The calculation results are compared with the existing test data and the results of semi empirical formula.On this basis,we divide three failure modes of strip foundation and give corresponding bearing capacity calculation methods.The results show that the failure forms of the foundation can be divided into punching shear failure,transition failure and general shear failure.The simplified calculation method corresponding to the transition failure mode can be used as a reference for practical engineering design.

关 键 词：成层砂土 条形基础 承载力 破坏机理 有限元塑性极限分析 

分 类 号：TU443[建筑科学—岩土工程]