以某桥台危岩体为例研究危岩体在地震作用时的稳定性

摘要

危岩体作为多发性的地震地质灾害,其对工程建设有着重大威胁.地震是引发危岩体破坏的一个因素.在滑移式危岩体、坠落式危岩体和倾倒式危岩体的计算中只考虑了危岩体在地震水平系数为常数的常规状态下的稳定性,而没有考虑在不同地震烈度情况下危岩体的稳定性.简要描述了危岩体的稳定性分析方法,以新疆迪那2井区主干道桥梁四号桥台的危岩体稳定性为例,着重强调了危岩体在不同地震设防水准情况下的稳定性,并进行了计算.%As a multiple earthquake geological hazard, dangerous rock body is a great threat to engineering construction. Earthquake is a main cause for failure of dangerous rock body. The calculation of shifting-type, falling-type and dumping-type dangerous rock body considered the stability merely when horizontal earthquake coefficient was a constant but neglected the stability of various seismic intensity. Taking stability of No. 4 bridge abutment in Dina 2 well area as example, this paper described analysis method of bridge abutment stability and emphasized stability under different seismic fortification criterion.