软土异形基坑开挖离心模拟试验研究

采用离心模拟试验对非对称异形基坑的开挖过程进行了模拟，应用停机开挖方式，分三步进行了开挖。根据左墙与中墙的间距L分别设置了三种不同的工况L为30，18，6 m，并进行了对比分析，研究左墙与中墙的距离对中墙的变形特性影响以及墙后的土压力分布规律。结果表明:随着左墙与中墙距离L的减小，开挖完成后中墙外侧的土压力逐渐增大，中墙顶部的左侧水平位移逐渐减小；上部悬臂下部内支撑开挖的坑中坑与普通基坑围护结构变形特性不同。

Study on Centrifuge Model Test of Irregular Foundation Pit Excavation in Soft Ground

The excavation process is simulated for the of the asymmetric irregular foundation pit by the centrifugal simulation test:excavation in three steps and shutdown excavation method. Three different working conditions are set according to the distance L between left wall and middle wall, respectively L=30, 18, 6 m, and comparative analysis is performed to research how the distance between left and middle wall impact the deformation characteristics influence of the middle wall as well as the soil pressure distribution after the wall. The result shows that, with decrease in the distance between left and middle walls, the soil pressure outside the middle wall is gradually increasing after the excavation, the left-side horizontal displacement at the top of the middle wall is gradually decreasing; The pit in pit foundation with upper part excavated by cantilever and lower part by interior support is different from the ordinary foundation pit on the retaining structure deformation characteristics.