大跨度暗挖地铁车站台阶法施工沉降特点研究

Study on the Characteristics of Construction Settlement Caused by Benching Tunnelling Method in Large- span Metro Station

以青岛某地铁车站工程为背景,针对大跨度地铁车站主体隧道台阶法施工,利用MIDAS/GTS仿真数值模拟软件对不同台阶数量的开挖方案进行模拟研究,并结合工程现场监测数据,经过对比分析得出基于坚硬岩石地层条件下大跨度地铁车站台阶法施工沉降特点,从地表沉降控制的角度提出合理的台阶数量,为类似工程的开挖方案设计与施工沉降控制提供参考依据。

Based on a metro station project in Qingdao, this paper simulates and studies several kinds of excavation schemes which have different bench number. After researching the real monitoring data which is basically consistent with the simulating results and can prove numerical simulation method is credible, it is concluded the characteristics of construction settlement caused by benching tunnelling method in large - span metro station when it is located in solid rock layer, and proposed the reasonable bench number from the perspective of settlement control, which can provide some available basis for the design of excavation scheme and the control of the construction settlement in those similar projects.