刚柔性条形基础下非饱和土地基的承载特性  

Bearing capacity research on unsaturated subsoil under flexible and rigid shallow foundations

作　　者：马少坤[1] 扈萍[2] 秦会来[3] 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]济南大学土木建筑学院,山东济南250022 [3]同济大学地下建筑与工程系,上海200092

出　　处：《广西大学学报（自然科学版）》2010年第4期649-654,共6页Journal of Guangxi University（Natural Science Edition）

基　　金：交通部西部交通建设科技项目(200431822311);广西大学博士后启动项目(XBZ100108)

摘　　要：为了对比研究刚性基础和柔性基础下地基随饱和度变化的承载特性,通过增量加载的有限元方法,结合非饱和土常含水量三轴剪切试验成果及相关的抗剪强度预测模型,对多种饱和度下的刚柔性条形基础下地基承载特性进行了对比分析。结果发现:刚柔性基础地基的临塑荷载及相对位移均随饱和度的减少而显著加大;地基承载力随饱和度的减少而显著加大,但递增梯度减小;刚性基础地基极限承载力相对于柔性基础地基对饱和度更为敏感;随着饱和度的减少,滑动面不断加深、加大,并且滑动面越发明显。In order to study the bearing capacity variation of the unsaturated subsoil under rigid and flexible foundations with different water saturation, incremental elastoplastic finite element method （FEM） is employed. In the FEM analysis, Mohr-Coulomb inside-tangent circle yield criterion with associated flow rule is adopted. Some conclusions are obtained from computational results of two kinds of foundations mentioned above. It can be concluded that critical edge pressure and relative displacement increase with water saturation. Ultimate bearing capacity changes in the same pattern while increment ratio decreasing and subsoil under rigid foundation is more sensitive to water saturation. Slip surface becomes deeper, larger and more obvious with the saturation reduced.

关 键 词：地基承载力 非饱和土 刚性基础 柔性基础 

分 类 号：TU446[建筑科学—岩土工程]