浅基础宽度修正对黏性土地基承载力的影响  

Effect of Width Correction of Shallow Foundation on Bearing Capacity of Cohesive Subsoil

作　　者：刘忠昌[1] 朱浮声[1] 王新[2] 刘文华 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110004 [2]辽宁省建筑设计研究院,辽宁沈阳110005

出　　处：《东北大学学报（自然科学版）》2008年第3期403-407,共5页Journal of Northeastern University(Natural Science)

基　　金：辽宁省自然科学基金(20021008);教育部留学回国人员科研启动基金(2003821178)．

摘　　要：通过沈阳市黏性土地基不同压板尺寸平板载荷试验结果的对比分析,提出了承载力考虑尺寸效应的基础宽度修正的新方法.然后分析了各种压板(基础)尺寸的沉降计算值和试验值,指出黏性土地基承载力取值应以变形作为控制指标.对于中、高压缩性土,地基的实际沉降一般大于按分层总和法计算的沉降,尤其是基础宽度愈大,其差异愈明显.针对目前设计中存在的问题,对地基承载力设计取值进行了全面分析,提出了基础工程的概念设计.试验结果表明,随压板宽度增加,黏性土地基承载力呈幂函数规律衰减.A new method taking account of the effect of foundation dimensions on the bearing capacity of cohesive subsoil is proposed, based on the foundation loading tests which were done on two areas of cohesive subsoil in Shenyang City with loading plates of different dimensions used as foundations The settling amount under the action of loading plates of different widths were measured and calculated, and the comparative analysis indicated that the control index of bearing capacity of cohesive subsoil should be taken from the deformation values of cohesive subsoil. The actual settling amount of highly/intermediately compressed subsoil is generally greater than that calculated by layered summation, and the bigger the width of foundation, the greater the discrepancy between the actual and calculated settling amount, An overall analysis was therefore made to the values taken for the bearing capacity of subsoil in design in view of the existing design problems. And a conceptual design is proposed for foundation engineering. Testing results showed that bearing capacity of cohesive subsoil decreases exponentially with the increasing width of loading plates.

关 键 词：黏性土地基 平板载荷试验 宽度修正 承载力特征值 尺寸效应系数 

分 类 号：TU471.1[建筑科学—结构工程]