基坑工程侧邻地铁变形影响三维数值分析

THREE-DIMENSIONAL NUMERICAL ANALYSIS OF DEFORMATION INFLUENCE OF FOUNDATION PIT BESIDE THE SUBWAY TUNNEL

基坑工程对邻近地铁隧道的影响已有较多的研究成果,但地铁隧道的存在对基坑工程的影响,受关注的较少。文中基于HSS模型,通过数值分析,对邻近地铁的基坑开挖进行模拟,着重分析既有隧道及不同隧道直径对基坑工程的影响。研究结果表明,隧道直径的大小对邻近基坑的围护结构侧向变形存在较大的影响,隧道直径增大,基坑侧壁变形明显增大;且越靠近基坑侧壁的平面中心位置,受隧道直径变化的影响越大。

There have been many research results on the influence of foundation pit engineering on adjacent subway tunnels, but the influence of the existing subway tunnels on foundation pit has received less attention. Through numerical simulation analysis based on the HSS model, this paper simulates the excavation of the foundation pit adjacent to the subway tunnel, and focuses on the analysis of the existing tunnels and the influence of different tunnel diameters on the foundation pit. The results show that the size of the tunnel diameter has a great influence on the lateral deformation of the foundation pit. As the diameter of the tunnel increases, the deformation of the sidewall of the foundation pit increases significantly;the closer to the center of the sidewall of the foundation pit, the deformation of the sidewall of the foundation pit is more affected by the change of the tunnel diameter.