非对称基坑开挖监测位移下数值对比分析

以南京市青奥轴线地下交通工程主隧道基坑非对称开挖水平位移监测数据为依据,对水平位移监测值与ABAQUS数值模拟值进行对比分析。得出结论:墙体水平位移首先是悬臂开挖的墙顶向外发生三角形分布的位移,然后随着支撑的架设,墙体发生转动,数值模拟值与实际监测值基本符合;在开挖面附近的土压力,随着墙体高度的增加而增大;在支撑以上部分,模拟值要小于计算值,而在开挖面以下部分,则模拟值大于计算值;随着悬臂段开挖深度的增加,悬臂段最大土压力值也在逐渐增加,墙底土压力值在逐渐减小。

Comparison of numerical simulation of asymmetric excavation based displacement monitoring

In this paper, the Youth Olympic Games in Nanjing underground traffic engineering tunnel axis of the main excavation pit asymmetric horizontal displacement monitoring data were taken as the basis for horizontal displacement monitoring. The numerical values of the ABAQUS simulation values were analyzed. It was concluded that Wall horizontal displacement occurs firstly at the top of the wall outward displacement of the cantilever excavation triangular distribution, and with the support of the erection, wall rotation occurs. The numerical simulations meet with actual monitored values; the pressure in the soil near the excavation face increases with increasing height of the wall. Above supporting section, the analog value is less than the calculated value; and in the following part of the excavation face, the analog value is greater than the calculated value; with the increasing depth of the excavation boom segment, the largest segment cantilever earth pressure is gradually increased, wall subsoil pressure value decreases.