北京交通大学学报2018，Vol.42Issue(1)：7-17,11.DOI:10.11860/j.issn.1673-0291.2018.01.002
砂卵石地层条件下台阶式基坑的地表变形特点及地层补偿法应用
Surface subsidence features of pit in pit foundation and application of stratum compensation theory in sand cobble stratum
摘要
Abstract
"Pit in pit" is a common excavation problem,and its excavation form and different locations increase the complexity of stress and displacement field of surrounding stratums,bringing about a certain difficulty for design and construction.Based on the typical sandy cobble stratum of Beijing,deformation features of pit in pit foundation are analyzed by applying the numerical model,and three factors are compared with ground deformation,which aredistance,depth and widthof inner pit edge.Meanwhile,the adaptability of stratum compensation method in sand cobble stratum in Beijing is discussed,and suggestions for similar engineering in other fields in terms of the estimation of depth of wall lateral displacement are also provided.The results show that shape of soil mass between inner pit and outer pit mainly causes the different surface deformations of both sides.Stratum compensation methodis applicable for describing the relation ship between the ground surface deformation of pit in pit foundation and wall lateral displacement.The research achievements can provide references for monitoring measurement of pit in pit foundation and construction fine control under sand cobble stratum in Beijing and other similar areas.关键词
台阶式基坑/地表沉降/墙体侧移/地层补偿法/砂卵石地层Key words
pit in pit foundation/surface subsidence/wall lateral displacement/stratum compensation theory/sand cobble stratum分类
建筑与水利引用本文复制引用
孙毅,张顶立,赵勇..砂卵石地层条件下台阶式基坑的地表变形特点及地层补偿法应用[J].北京交通大学学报,2018,42(1):7-17,11.基金项目
中国铁路总公司科技研究开发计划重大课题(2017G007-B) Science and Technology Research and Development Major Program of China Railway Corporation(2017G007-B) （2017G007-B）
