大型基坑开挖工序对邻近高速铁路的影响分析

The Impact and Analysis of the Excavation Process of Large-scale Foundation Pit on Adjacent High-speed Railways

为研究基坑开挖顺序在邻近铁路基坑施工中的重要性,控制基坑施工对铁路的影响,保护铁路运营安全,本文以某地下车库基坑邻近高速铁路桥为依托,采用有限元软件Midas gts分别对长条形基坑的两种不同开挖方式进行模拟分析,并与实际监测数据进行对比,验证了数值模拟的合理性。结果表明,长条形基坑分段开挖对控制邻近铁路变形有重要作用,不同程度地减小了竖向、横桥向、顺桥向位移。

In order to study the importance of foundation pit excavation sequence in the construction of adjacent railway foundation pits,control the impact of foundation pit construction on the railway,and protect the safety of railway operations,this paper relies on the foundation pit of an underground garage adjacent to a high-speed railway bridge and simulated and analyzed two different excavation methods of a long foundation pit by the finite element software called Midas gts,and compared them with actual monitoring data to verify the rationality of the numerical simulation.The results show that the segmented excavation of the long foundation pit plays an important role in controlling the deformation of the adjacent railway,reducing the vertical,cross-bridge and along-bridge displacements to varying degrees.