基坑开挖及降水对坑外地表沉降的影响  

The influence of foundation pit excavation and dewatering to ground surface settlement

作　　者：张世民[1] 景峰卫 黄英省[1] 孙苗苗[1] 

机构地区：[1]浙江大学城市学院工程学院,杭州310015 [2]安徽理工大学土木工程系,安徽淮南232001 [3]宏润建设集团有限公司,浙江宁波315000

出　　处：《土木建筑与环境工程》2016年第5期43-49,共7页Journal of Civil,Architectural & Environment Engineering

基　　金：杭州市科学技术委员会项目(20160533B95);浙江省住建厅项目(2015K60);浙江大学城市学院教师基金项目(J-15017)~~

摘　　要：考虑降水、支护结构变形以及基坑隆起3个因素引起的基坑周围土体的沉降,根据降水引起土体沉降的机理,运用修正的分层总和法单独计算出由降水引起的周围土体沉降。通过研究基坑开挖引起坑外土体沉降的规律,推导出由基坑开挖引起的坑外土体沉降理论公式。把降水引起的沉降及基坑开挖引起的沉降进行叠加,加入修正系数,最终以简化的理论公式合理地计算出基坑周围土体沉降。具体工程验证表明,推导的理论解析解与实测数据十分接近,能有效预估基坑周围土体沉降,为施工方案编制提供可靠的理论依据,最大限度减少基坑施工对周围环境的影响。Settlement of soil around the foundation pit caused by dewatering,deformation of retaining structure and foundation pit uplift are considered to be the three factors causing ground surface settlement.Using layer-wise summation method to calculate the settlement of surrounding soils caused by dewatering according to the soil settlement mechanism of dewatering.By studying the law of the settlement of the soil caused by the foundation pit excavation,the theoretical formula for the settlement of the soil caused by the foundation pit excavation is deduced.Add up the subsidence caused by the foundation pit precipitation and the settlement caused by the excavation of foundation pit,and revise the results with Modified coefficient,eventually the settlement of soil around the foundation pit is reasonably calculated by the simplified theoretical formula.Through specific engineering verification shows that the derived theoryanalytical solution is very close to the measured data,the derived theory analytical solution can effectively predict the soil settlement around the foundation pit,thereby this will provides the reliable theory basis for the main body of the construction scheme,to reduce as much as possible the effect on the surrounding environment.

关 键 词：土体沉降 降水 支护结构变形 基坑底部隆起 解析解 

分 类 号：TU46[建筑科学—结构工程]