相邻基坑先后开挖互相影响研究  

Study on the interaction between adjacent excavation

作　　者：郭思磊 Guo Silei(China Railway 14th Bureau Group Co.,Ltd.,Jinan Shandong 250000,China)

机构地区：[1]中铁十四局集团建筑工程有限公司,山东济南250000

出　　处：《山西建筑》2023年第18期100-104,共5页Shanxi Architecture

摘　　要：以软土地区相邻基坑开挖为背景,根据分步开挖时的实际监控数据,利用有限元分析软件对各工况下的变形及受力进行统计分析,通过对比单基坑开挖和双基坑开挖施工工况,分析相邻基坑开挖对本体基坑围护墙侧移、坑外地表沉降及支撑轴力的影响。结果表明:相邻基坑开挖将引起本体基坑向相邻侧产生附加位移;同步施工时,靠近相邻基坑一侧的围护墙附加位移大于对侧墙体;本体基坑与相邻基坑之间夹心土的地表沉降存在明显的叠加效应,相邻基坑的开挖将显著增加该部分土体的沉降量;相邻基坑开挖将引起本体基坑支撑轴力卸载,靠近相邻基坑一侧支撑轴力减弱,使轴力呈非对称分布。Based on the actual monitoring data of the excavation of adjacent foundation pit in soft soil area,the deformation and stress under each working condition are analyzed statistically by using the finite element analysis software,by comparing the excavation of single and double foundation pit,the influence of adjacent foundation pit excavation on the lateral displacement of retaining wall,surface settlement and support axial force is analyzed.The results show that the excavation of adjacent foundation pit will cause additional displacement to adjacent side,and the additional displacement of retaining wall near adjacent foundation pit is larger than that of the opposite side.The surface settlement of the sandwich soil between the foundation pit and the adjacent foundation pit has obvious superposition effect,and the excavation of the adjacent foundation pit will increase the settlement of the soil.The excavation of adjacent foundation pit will cause the unloading of the axial force of the support of the foundation pit,and the axial force of the support near the adjacent foundation pit will weaken,making the axial force distributed asymmetrically.

关 键 词：相邻基坑 分步开挖 互相影响 有限元软件 

分 类 号：TU443[建筑科学—岩土工程]