超深长条形基坑立柱上浮规律及其对钢筋混凝土支撑附加弯矩的影响

基坑开挖会造成立柱上浮，引起钢筋混凝土支撑的附加弯矩，严重的会造成支撑失稳。通过系统监测超深长条形基坑开挖过程中不同断面处地下连续墙和立柱上浮量，该文总结了基坑开挖过程中立柱上浮和规律，得到了影响基坑立柱上浮的三个因素：开挖深度、开挖速度和立柱位置。从而推导了立柱上浮造成的钢筋混凝土支撑附加弯矩和立柱上浮力的计算方法。根据监测结果，计算了某基坑施工过程中立柱上浮造成的钢筋混凝土支撑附加弯矩的变化规律。

Floating-up Law of Upright Column and Its Influence on Additional Bending Moment of Steel Reinforced Concrete Support in Super Deep Long Strip Foundation Pit

The upright column will float up because of the excavation of a foundation pit. It will create the additional bending moment of steel reinforced concrete support, and will cause the destabilization of support if seriously. The floating conditions of the concrete diaphragm wall and upright column at the different sections can be monitored in the course of excavating the super deep long strip foundation pit by the system monitor. The article sums up the floating-up law of upright column in the course of the p...