软土地基中单桶基础承载力的模型试验研究  

Study of Model Test on Bearing Capacity of Bucket Foundation in Soft Soil Foundation

作　　者：李向东[1] 王建华[1] 杨海明[1] 刘锟[1] 

机构地区：[1]天津大学建筑工程学院,天津市300072

出　　处：《勘察科学技术》2007年第3期3-5,32,共4页Site Investigation Science and Technology

基　　金：国家自然科学基金资助项目(50379035)

摘　　要：通过模型试验,确定了软土地基中一个单桶基础的竖向与水平极限承载力。依据试验结果及软土层的强度参数,对计算桶型基础承载力的一些关系式做了比较,进而建议了评价软土中桶型基础水平及竖向承载力的计算公式。进一步对确定软土地基桶型基础承载力的有限元方法进行了研究。结果表明,若采用理想弹塑性模型,按照地基土的不固结不排水强度Su,且把土体的弹性模量取为强度的300-400倍时,计算与试验得到的荷载位移曲线能较好吻合。The ultimate bearing capacity of bucket foundation with the vertical load or horizontal load is determined by model tests in soft soil foundation. Based on the results of model tests and the strength parameters in soft soil layers, the relation formula of the bearing capacity of bucket foundation is compared and calculation formulas are proposed. Accordingly, the FEM methods of calculating the bearing capacity of bucket foundation in the soft soil foundation are studied. The results show that if the perfectly elasto-plastic models are applied, according to the unconsolidated undrained shear strength Su, and the elastic modulus of soil is 300 - 400 times as large as strength, the experimental curves are coincide with the calculation curves.

关 键 词：桶型基础 模型实验 有限元 承载力 

分 类 号：TU476[建筑科学—结构工程]