盾构施工在不同推进压力下对地表沉降的影响

Influence of Shield Tunnel Construction on Surface Subsidence Under Different Propulsion Pressure

盾构法隧道施工在地铁建设中的应用越来越广泛,推进压力作为影响盾构施工对地表沉降影响的因素之一,需要进行合理控制。使用MIDAS/GIS软件对合肥某盾构隧道区间施工进行了数值模拟,通过控制施工过程中推进力的变化,分析在不同推进力的条件下周围地表的沉降。由此得出结论:推进压力的大小在合理范围内对地表沉降的影响有一定的规律,在一定范围内推进压力越大,地表沉降越小。运用此规律可以为后续盾构施工工程减小地表沉降提供参考。

The application of shield tunneling in subway construction is more and more extensive. As one of the factors influencing the settlement of the surface caused by shield construction, the advancing pressure needs to be reasonably controlled. The paper used MIDAS/GIS software to simulate the tunnel construction of a certain shield tunnel in Hefei. By controlling the changes of the propulsion force during the construction process, the settlement of the surrounding ground under the conditions of different propulsion forces was analyzed. It was concluded that the influence of the thrust pressure on the settlement of ground surface within a reasonable range has certain rules. In a certain range, the pressure is greater and the surface settlement is smaller. Using this law can provide reference for the subsequent shield construction work to reduce ground settlement.