大断面浅埋地铁施工对地表影响的模型试验

以广州地铁站前停车线为工程背景，通过室内大比例相似模型试验，结合数值模拟计算，研究大断面浅埋地铁在上下台阶法不同开挖步骤中产生的洞周位移、地表和地层的位移响应。结果表明:通过相应的辅助工法和合理的施工工序，台阶法能有效控制上台阶开挖引起的洞周位移和地表沉降，从而控制整个隧道开挖对周边环境的影响，保证隧道快速、安全施工。

Model Test on Ground Surface Impact Caused by Large-section Shallow-buried Metro Construction

Taking stop line engineering of Guangzhou Metro Station for example,through similar indoor large-scale model test,combined with numerical simulation,the convergence of tunnel perimeter,displacement response of ground surface and stratum during excavation of large-section shallow-buried metro by benching tunneling method are studied.The results show that through the corresponding auxiliary construction method and reasonable construction procedures,benching tunneling method can effectively control convergence of tunnel perimeter and ground surface settlement caused by upper bench excavation,and thus reduces the impact on ambient environment to ensure rapid and safe construction.