基于FLAC^(3D)数值模拟的地铁异型深基坑开挖阳角效应研究  

Study on the External Corner Effect of Excavating on Metro Shaped Deep Foundation Pit Based on FLAC^(3D) Numerical Simulation

作　　者：沈启炜[1,2] 

机构地区：[1]中铁十八局集团有限公司,天津300222 [2]福州大学,福建福州350116

出　　处：《铁道建筑技术》2017年第7期1-6,23,共7页Railway Construction Technology

摘　　要：开展异型深基坑开挖的变形特性研究具有重要的工程意义和理论价值。为研究异型深基坑阳角引起的空间效应,基于相似设计理论并结合土工试验结果,对滨海花岗岩残积土地层异型深基坑进行了相似模型试验,利用FLAC3D对基坑开挖引起的阳角空间效应进行研究,分析不同阳角角度和不同阳角臂长对基坑变形的影响,并以厦门地铁吕厝站为工程实例进行对比分析。研究结果表明:影响阳角空间效应的两个因素主要为基坑阳角的夹角及臂长,并可将阳角类型分为3类;阳角处的空间变形和沉降与阳角夹角及臂长都相关;阳角臂长对空间效应的影响系数大于阳角夹角的影响系数。It is of great engineering significance and theoretical value to study the deformation characteristics of shaped deep foundation pit excavation. Based on the similarity design theory and the results of geotechnical test,a similar model test was carried out on the deep foundation pit of the coastal granite residual soil strata. The FLAC^3D was used to investigate the effect of the excavation. The effects of different angle and arm length of different external corners on the deformation of the foundation pit were analyzed. The comparative analysis of the project was carried out with Lvcuo Station of Xiamen Metro.The results show that the two factors that affect the spatial effect of the external corner are mainly the angle and arm length of the external corner of foundation pit,and the types of external corner can be divided into three categories. The deformation of the foundation pit and the surrounding surface settlement are related to the angle and arm length of the external corner. The influence coefficient of the arm length on the space effect is greater than the angle of the external corner.

关 键 词：异型深基坑 阳角效应 FLAC^3D 角度 臂长 

分 类 号：TU433[建筑科学—岩土工程]