软土下卧倾斜硬层基坑变形规律及抗隆起稳定性  

Deformation law and basal heave stability of foundation pit with inclined hard layer lying under soft soil

作　　者：张海洋 张京伍 李衍翔 李明东 万愉快 ZHANG Hai-yang;ZHANG Jing-wu;LI Yan-xiang;LI Ming-dong;WAN Yu-kuai(School of Civil and Architectural Engineering,East China University of Technology,Nanchang 330013,China;School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China)

机构地区：[1]东华理工大学土木与建筑工程学院,江西南昌330013 [2]宁夏大学土木与水利工程学院,宁夏银川750021

出　　处：《水运工程》2022年第11期208-214,共7页Port & Waterway Engineering

基　　金：国家自然科学基金项目(51869001)。

摘　　要：受地质构造及地层沉积影响,实际地层分布并非完全水平。以软土下卧倾斜硬层基坑为研究对象,通过建立基坑土体非对称有限元模型,开展倾斜硬层斜面倾角、斜面与支挡结构距离对基坑变形及抗隆起稳定性的影响规律研究。结果表明:1)斜面倾角、斜面与支挡结构距离对基坑变形规律及安全系数存在显著影响。2)倾斜硬层造成基坑两侧软土不对称分布。土层厚度越小支挡结构受到的约束作用越大,该侧坑底隆起量、支挡结构变形、坑外地面沉降都小于土层厚度大的一侧。Due to the influence of geological structure and stratum deposition, the actual stratum distribution is not completely horizontal. Taking the foundation pit with inclined hard layer lying under soft soil as the research object, the influence law of slope angle hard layer and distance between slope and retaining structure on foundation pit deformation and basal heave stability are studied by establishing asymmetrical finite element model of foundation pit. The results show that: 1)The slope angle and the distance between slope and retaining structure have significant influence on the deformation law and safety factor of the foundation pit. 2)The inclined hard layer causes asymmetrical distribution of soft soil on both sides of the foundation pit. The smaller the soil thickness is, the more constrained the retaining structure is. The basal heave of the pit bottom, deformation of the retaining structure and ground settlement outside the pit on the side are all smaller than that on the side with larger soil thickness.

关 键 词：基坑工程 倾斜地层 变形规律 安全系数 有限元模拟 

分 类 号：TU470.3[建筑科学—结构工程] U641[建筑科学—土工工程]