合肥市地铁车站出入口的基坑开挖变形因素分析  

Analysis of Deformation Factors of Foundation Pit Excavation at Entrance and Exit of Hefei Metro Station

作　　者：雷庆关 蔡常宽 祝金龙 LEI Qingguan;CAI Changkuan;ZHU Jinlong(School of Civil Engineering,Anhui Jianzhu University,Hefei Anhui 230601;School of Civil and Architectural Engineering,Anhui University of Science and Technology,Huainan Anhui 232001)

机构地区：[1]安徽建筑大学土木工程学院,安徽合肥230601 [2]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《湖北理工学院学报》2024年第6期29-35,共7页Journal of Hubei Polytechnic University

基　　金：安徽省高等学校自然科学研究重大项目(项目编号:KJ2014ZD07)。

摘　　要：为了研究围护桩直径、嵌固深度、内支撑刚度对围护结构水平位移和坑周地表沉降的影响规律,以合肥市地铁S1号线史河路站3号出入口基坑为研究对象,通过MIDAS GTS NX软件建立基坑开挖支护过程数值模型,与现场监测结果进行了对照分析,并验证了数值模拟的可靠性。结果显示:开挖完成后,地连墙水平位移-深度变化呈内凸形,地连墙水平位移随地连墙厚度及嵌固深度增大而减小;坑周地表沉降为小沉降凹槽形,坑周地表沉降随地连墙厚度及内支撑刚度增大而减小。内支撑刚度对地连墙水平位移影响较小,嵌固深度对坑周沉降影响较小。In order to investigate the influence of the diameter of bearing piles,depth of thrust and internal support stiffness on the lateral movement of the surrounding frame and the ground settling in the pit region,the MIDAS GTS NX system was used to set up a digital model of the basement opening and bearing process,based on the pit of No.3 entrance/exit of Shihe Road Station of Hefei Metro Line S1,and the monitoring results were compared with those of the site in order to identify the reliability of the simulation.The results show that after the completion of digging,the displacement of diaphragm wall is in the shape of internal camber,and the surface sedimentation around the pit is in the shape of a small sinkhole.The level of diaphragm wall displacements declined with the increase of the depth of the diaphragm wall and the depth of thrust,and the surface ground subsidence around the pit decreases with the diaphragm wall thickness and internal support stiffness,the rigidity of the internal support and the embedment depth had a small effect on the level of wall displacements and the subsidence around the pit,respectively.

关 键 词：出入口基坑 监测 数值模拟 地连墙 

分 类 号：TU753[建筑科学—建筑技术科学]