红黏土地基承载力的离心模型试验与数值模拟  

Centrifugal model test and numerical simulation on bearing capacity of red clay ground

作　　者：马少坤[1,2,3] 黄茂松[1,3] 刘怡林[1,3,4] 杜佐龙[1,3] 

机构地区：[1]同济大学岩土及地下工程教育部重点试验室,上海200092 [2]广西大学,广西南宁530004 [3]同济大学地下建筑与工程系,上海200092 [4]交通部公路科学研究所,北京100088

出　　处：《岩土工程学报》2009年第2期276-281,共6页Chinese Journal of Geotechnical Engineering

基　　金：西部交通建设科技项目(200431822311)

摘　　要：为了对比研究柔性和刚性浅基础黏土地基破坏机理和极限承载力,采用离心模型试验和数值分析方法研究了云南红黏土。得到如下结论:柔性基础地基相对于刚性基础地基极限承载力有明显的提高,沉降也相应增加;柔性基础地基有更好的位移协调性,其裂缝开展较晚并远离基础角点,分布更密、更均匀;刚性基础地基的滑动面要比柔性基础更大、更深;基础外侧地基土竖向位移由持续沉降转向隆起时的承载力可作为局部剪切破坏的极限承载力。The purpose of this study is to investigate the failure mechanism and ultimate bearing capacity of subsoil under rigid and flexible foundations on red clay subsoil. Centrifuge model model tests and numerical simulations are conducted and some useful conclusions are drawn. The beating capacity of a flexible foundation may be increased obviously compared to that of a rigid foundation. This increase, however, may also result in the increase of settlement. The displacements of subsoil under a flexible foundation become more harmonious, and therefore cracks develop later on locations far from the comer of the foundation as distributions become more dense and uniform. Compared to that of a flexible foundation, the slip surface of a rigid foundation is larger and deeper. The ultimate beating capacity for a local shear failure may be determined when the vertical displacement of subsoil beside the foundation is transferred from continuous sinking to heave.

关 键 词：地基极限承载力 重塑红黏土 离心模型试验 柔性基础 刚性基础 

分 类 号：TU411[建筑科学—岩土工程]