基坑内土体加固对地表沉降的影响分析  

Influence of improvement soil in foundation pits on ground settlement

作　　者：夏建中[1] 罗战友[1,2,3] 龚晓南[4] 

机构地区：[1]浙江科技学院建筑工程学院,浙江杭州310023 [2]浙江大学岩土工程研究所,浙江杭州310027 [3]浙江大学宁波理工学院,浙江宁波315100 [4]浙江大学 岩土工程研究所,浙江杭州310027

出　　处：《岩土工程学报》2008年第S1期212-215,共4页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(50708097);中国博士后科学基金一等项目(20060400317);浙江省教育厅基金(20061459);浙江省高校青年教师资助计划项目(0202303005);浙江省高校中青年学科带头人计划项目;浙江省151人才项目

摘　　要：在软土地区采用悬臂式支护结构易造成基坑周边地表沉降过大,工程中常采用坑底加固措施达到减少侧向位移的目的。为了得到坑底加固土体对地表沉降的影响规律,首先以弹性地基梁法为基础建立了基坑的有限元模型,利用建立的模型和地表沉降理论分析了坑内土体的加固深度及程度对地表沉降的影响。结果表明,地表沉降随基坑内土体加固深度及程度的增大而减小,而且还存在着临界加固深度及程度。因此,合理地确定坑内土体的加固深度及程度既能保证周边建筑物的安全,又能够节省工程造价。Cantilever retaining structure causes large ground settlement in soft soil regions.Improvement soil is an effective measure to decrease the ground settlement.Based on the elastic foundation beam theory,a finite element model of foundation pits was established.The effects of soil improvement on ground settlement of cantilev.er retaining structure were studied.The results show that the ground settlement decreases with the deceases of depth and degree of improvement soil.There are critical depth and degree in improvement soil.To save the engineering cost and guarantee the building safety,it is important to reasonably decide the depth and degree of improvement soil.

关 键 词：基坑 悬臂式支护结构 地表沉降 土体加固 

分 类 号：TU433[建筑科学—岩土工程]