管廊区间泵房设计与施工数值模拟分析

Numerical simulation analysisof Pump Room In Pipe Gallery Section for Design and Construction

采用盾构法施工的管廊区间隧道,往往为了满足排水要求需要在区间低点设置废水泵房。但设计施工时,经常面临空间狭窄、管片破除、工序复杂等问题。基于某岩溶区域管廊隧道低点泵房的设计与施工,系统性进行泵房尺寸设计研究,并从优化支撑设置及施工工序两方面,对泵房的开挖过程进行数值模拟。通过模拟泵房开挖过程中风险最大的施工步骤进行计算,结果表明,泵房开挖采取非整环同时破除的分步施工的原则,支撑受力及稳定性满足要求。采用“钢环梁+平面闭合钢支撑”的支撑形式,可以充分发挥空间效应,保障施工过程中隧道的安全。

In order to meet the drainage requirements,the waste water pump room was often set at the low point of the tunnel in the pipe gallery section constructed by the shield method,but the design and construction often face problems such as narrow space,broken segments,and complex procedures.Based on the design and construction of the low point pump room of a pipe gallery tunnel in a karst area,the size design of the pump room was systematically studied,and the excavation process of the pump room was numerically simulated from two aspects of support setting and construction process.By simulating the most risky construction step in the process of pump room excavation,the calculation results show that the pump room excavation adopts the principle of step-by-step construction with non-integrated ring broken at the same time,the support force and stability meet the requirements,and the support form of"steel ring beam+plane closed steel support"could give full play to the space effect and ensure the safety of the tunnel during the construction process.