土层参数变化对深基坑变形的敏感性及其规律  

Sensitivity and Discipline of Deep Pits Deformation with Different Soil Parameters

作　　者：莫时雄[1] 王杰光[2] 李瑞雄[2] 

机构地区：[1]中南大学土木建筑学院,长沙410083 [2]桂林工学院土木工程系,广西桂林541004

出　　处：《桂林工学院学报》2008年第4期492-496,共5页Journal of Guilin University of Technology

基　　金：广西科学基金资助项目(桂科基0575097);广西建筑工程检测与试验重点实验室资助项目(桂科能07109005-05);广西区经贸委资助项目(桂经投资[2005]191);广西教育厅科研项目(桂教科研[2004]20)

摘　　要：不同地区土层参数各不相同,基坑变形对各参数变化的敏感性也不相同。以深圳某深基坑工程为研究对象,借助加权残值法和弹塑性有限元分析软件,计算该基坑在各工况下的变形,结果与实测值基本吻合。同时重点研究了土层参数变化对基坑开挖过程中水平位移和地表沉降的影响规律:土体的弹性模量、粘聚力、内摩擦角对基坑的水平位移和沉降影响较明显,尤以内摩擦角最为敏感,且地表沉降量随着土层内摩擦角的减小呈线性增加趋势。Soil parameters differ from areas. Sensitivity of pits deformation varies with the change of soil parameters. A deep pit in Shenzhen is an example to be analyzed by means of elastoplastic finite element method and weight residual method. Deformations are calculated in every load steps, which are consistent with the measurements. Meanwhile more attentions are paid to study the discipline of influence of pits horizontal displacement and soil vertical settlement caused by soil parameters changing during construction process. The results indicate that the horizontal displacement and vertical settlement of pits are affected obviously by soil elastic modulus, cohesion and angle of internal friction, and most by the third. Soil vertical settlement is increasing with decreasing of soil angle of internal friction.

关 键 词：深基坑 土压力 土层参数 敏感性 变形 

分 类 号：TU470.3[建筑科学—结构工程]