软土异形基坑开挖离心模拟试验研究  

Study on Centrifuge Model Test of Irregular Foundation Pit Excavation in Soft Ground

作　　者：姜萧[1] 马险峰[1,2] 袁聚云[1,2] 午鹏奇 JIANG Xiao MA Xianfeng YUAN Juyun WU Pengqi(School of Civil Engineering, Tongji University, Shanghai 200092, China Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China Shanghai Urban Construction Design ＆ Research Institute （Group） Co. , Ltd. , Shanghai 200125, China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]上海市城市建设设计总院(集团)有限公司,上海200125

出　　处：《路基工程》2017年第1期93-97,共5页Subgrade Engineering

基　　金：国家自然科学基金:软土超深开挖性能演化与极限失效机理的离心模拟研究(41272290)

摘　　要：采用离心模拟试验对非对称异形基坑的开挖过程进行了模拟,应用停机开挖方式,分三步进行了开挖。根据左墙与中墙的间距L分别设置了三种不同的工况L为30,18,6 m,并进行了对比分析,研究左墙与中墙的距离对中墙的变形特性影响以及墙后的土压力分布规律。结果表明:随着左墙与中墙距离L的减小,开挖完成后中墙外侧的土压力逐渐增大,中墙顶部的左侧水平位移逐渐减小;上部悬臂下部内支撑开挖的坑中坑与普通基坑围护结构变形特性不同。The excavation process is simulated for the of the asymmetric irregular foundation pit by the centrifugal simulation test： excavation in three steps and shutdown excavation method. Three different working conditions are set according to the distance L between left wall and middle wall, respectively L = 30, 18, 6 m, and comparative analysis is performed to research how the distance between left and middle wall impact the deformation characteristics influence of the middle wall as well as the soil pressure distribution after the wall. The result shows that, with decrease in the distance between left and middle walls, the soil pressure outside the middle wall is gradually increasing after the excavation, the left-side horizontal displacement at the top of the middle wall is gradually decreasing; The pit in pit foundation with upper part excavated by cantilever and lower part by interior support is different from the ordinary foundation pit on the retaining structure deformation characteristics.

关 键 词：异形基坑 离心模拟 变形特性 土压力 围护结构 

分 类 号：TU411.93[建筑科学—岩土工程]