浅埋矩形顶管始发渗流–应力耦合数值模拟与监测
Initial Seepage Stress Coupling of Shallow Buried Rectangular Pipe Jacking Numerical Simulation and Monitoring

矩形顶管广泛应用于城市短距离地下工程，顶管始发加固方案关系着工程的施工安全。依托无锡地铁4号线青石路站1号出入口顶管工程，针对富水条件下超浅埋顶管始发过程中可能存在的洞门涌水灾害进行模拟，得到了发生渗透时的地表变形及洞门变化规律。结果表明，出现洞门漏水灾害时围护结构和开挖面处土体均呈现向始发井基坑变形趋势，地表最大沉降量明显增大，始发井安全性降低。
Rectangular pipe jacking is widely used in urban short distance underground engineering. The reinforcement scheme of pipe jacking initiation is related to the construction safety of the project. Based on the pipe jacking project at the No. 1 entrance and exit of Qingshi Road Station of Wuxi Metro Line 4, the possible water inrush disaster in the launching process of ultra shallow buried pipe jacking under the condition of rich water is simulated, and the surface deformation and portal change law when seepage occurs are obtained. The results show that the retaining structure and the soil at the excavation face tend to deform towards the foundation pit of the launching shaft when the tunnel portal leakage disaster occurs, the maximum surface settlement increases significantly, and the safety of the launching well is reduced.