强地震作用下深基坑支护体系灾变破坏过程数值模拟

通过对地震作用下地下连续墙加钢支撑的基坑支护结构的稳定性进行三维动力有限元模拟，研究了基坑支护结构形式及其结构失稳、灾变破坏过程及时程特性、结构对地震波传播方向的敏感性，及其振动引起位移的空间分布特性.结果表明：在强地震作用下，基坑支护结构在极短时间（t≤10 s）内可以产生灾变破坏；地震波传播方向对结构体系的稳定性具有显著影响，其最不利的角度为轴向30°~40°；结构地震反应强度具有明显的区域分布特性.

Destruction Process Numerical Simulation of Underground Pit Supporting System under Earthquake Action

Based on the character of typical foundation pit support structure and method in gravel stratum,by establishing reasonable 3-D seismic response analysis numerical simulation,adopting LS-DYNA software,this paper studied the stability,disability mutation process and time-dependence characteristic of foundation pit and continuous concrete wall with steel support under intense earthquake action.The results show that failure happens in very short time;propagation direction of the seismic wave has a great influen...