地铁车站明挖深基坑围护结构变形规律分析

Analysis on Deformation Law of Retaining Structure of Open Excavation Deep Foundation Pit in Metro Station

以绍兴地铁2号线车站基坑工程为实例,通过对地连墙水平位移、支撑轴力、地表沉降现场监测数据的分析,得到绍兴地区基坑工程围护结构的相关变形规律并给出相应的控制措施。结果表明:墙体水平位移基本呈内凸型模式,最大侧移在40~60 mm之间,基坑地表沉降呈凹槽形模式,其地表沉降主要集中在50~80 mm左右。地连墙最大侧移δ_(hm)在(0.05%,0.37%)H范围内,平均值为0.21%H;地下连续墙最大侧移点埋深δ_(hm)主要落于(0.69%,0.94%)H范围内;墙后最大地表沉降δ_(hm)范围在(0.01%,0.5%)H内,平均值为0.26%H。

Taking the foundation pit project of Shaoxing Metro Line 2 station as an example,by analyzing the on-site monitoring data of the horizontal displacement,support axial force,and surface settlement of the diaphragm wall,the relevant deformation laws of the foundation pit engineering enclosure structures in Shaoxing area are obtained,and the corresponding control measures are provided.The results show that the horizontal displacement of the wall basically follows an inward convex pattern,with the maximum lateral displacement ranging from 40 to 60 mm.The surface settlement of the foundation pit follows a groove shaped pattern,with the surface settlement mainly concentrated around 50 to 80mm.For the maximum lateral displacement of the diaphragm wallδ_(hm) within the range of(0.05%,0.37%)H,the average value is 0.21%H.The maximum lateral displacement point burial depth of the underground continuous wallδ_(hm) mainly falls within the range of(0.69%,0.94%)H.For the maximum surface settlement behind the wallδ_(hm) within the range of(0.01%,0.5%)H,the average value is 0.26%H.