临近地铁隧道的非对称基坑受力及变形性状分析

Analysis of Stress and Deformation Behavior of Asymmetric Foundation Pit Adjacent to Metro Tunnels

对萧山华润万象汇大型基坑进行监测分析,将基坑近地铁加固侧与远离地铁侧非加固侧在支撑轴力、基坑周边地表沉降、深层土体水平位移和压顶梁沉降的监测数据进行对比分析。研究结果显示:两侧区域支撑轴力的变化规律一致,但由于土层分布的不均匀以及两侧基坑挖深不一致,加固侧轴力增长较快;在深层土体水平位移上都表现为中部侧移较大,但在最大水平位移出现深度、反弯点深度以及地表最大沉降这些方面,两侧区域存在一定差异;由于非加固侧排桩的纵向刚度小于加固侧的地下连续墙,所以非加固侧压顶梁沉降要大于加固侧压顶梁沉降。

By analyzing the monitoring data of Xiaoshan Huarun Wanxiang's large foundation pit,the result of comparing the reinforced side near the subway with the non-reinforced side away from the Metro in the data of supporting axial force,ground settlement,horizontal displacement of deep soil and the top beam deposition was got. The result shows that the change rules of axial force about the two region is similar. Because of the uneven distribution of the soil and different excavation depth,the axial force of the reinforced side increases rapidly. The horizontal displacement of deep soil is bigger in central section of each side while there are some differences in the maximum horizontal displacement of the deep soil,the depth of the reverse bend point and the maximum ground settlement; The top beam deposition of the non reinforced side is bigger than the reinforced sides' because the longitudinal stiffness of the non reinforced is smaller.