成层土中基坑开挖降水引起的地表沉降分析  

Analysis of settlement induced by dewatering during excavation in layered soil

作　　者：谢康和[1] 柳崇敏[1] 应宏伟[1] 杨伟[1] 

机构地区：[1]浙江大学土木工程系,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2002年第3期239-242,251,共5页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目 (5 973 8160 ) ;浙江省建设厅建设新技术新产品研制和推广项目

摘　　要：研究了成层土中基坑开挖降水引起的土中应力变化及周围地表沉降求解方法 ,在假定降水引发的渗流是一维竖向的条件下 ,推导了基坑周围土中有效应力和地表沉降计算公式 ,并结合具体基坑降水工程实例作了计算与实测结果的比较与分析 .研究结果表明 。The influence of dewatering on the settlement of ground surface surrounding a pit is one of the key problems in excavations. In this work, the change of effective stress in soil mass and the settlement of ground surface induced by dewatering during excavation in layered soil were studied. Analytical formulas for calculating the effective stress and the settlement were derived from the assumption that the seepage induced by dewatering was one-dimensional and vertical. With the formulas basis, a case was analyzed and the results were compared with the field measurements. It was shown that the changes in effective stresses resulted from dewatering and seepage are the main factors inducing settlement of ground surface.

关 键 词：成层土 基坑开挖 降水 地表沉降 

分 类 号：TU478[建筑科学—结构工程]