数值计算在轨道交通深基坑框架逆筑法中的应用

A Study of Numerical Calculation Applied in the Frame-top-down Construction Method Design of Deep Foundation Pit in Rail Transit

上海市轨道交通L11徐家汇站采用结合楼板设置钢筋混凝土支撑的框架逆筑法进行施工。设计中采用数值计算方法重点研究框架逆筑法中不同出土孔的开设位置对混凝土支撑水平刚度的影响,结合工程实际最终选定纵梁连续、车站横向两边跨混凝土板开孔的方案作为实施方案。根据监测结果,该方案实施效果良好,可供类似工程参考。

With the background of Xujiahui Sation of Shanghai Rail Transit L11, the project is adopting the combined floor with reinforced concrete supporting by the frame-top-down construction method. The influences of opening positions of different excavated holes on concrete supporting horizontal stiffness during frametop-down construction method are researched by numerical calculation method in the design. Combined with the practical engineering, the planof continuous longitudinal beam and horizontal both sides excavated holes crossing concrete slab of the station is determined to be the implementary one in the end. According to the monitoring results, the plan implementation effect is good enough to provide references for similar projects.