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当进行滑坡地震稳定性分析时,一般对滑体取某一固定的加速度,这忽略了地震波的传播过程。滑坡在地震中破坏的根本原因是地震波在岩土体中传播时,在滑体和滑床间形成了加速度差。推导了加速度差的计算公式,以青海省玉树机场路3号滑坡为原型,以玉树机场强震观测台的实测加速度时程为动力输入,采用传递系数法计算滑坡动力稳定系数时程曲线。结果表明,天然状态滑坡的稳定系数为1.269,最小动力稳定性系数为0.962,最小平均稳定系数为1.069。滑坡的整体稳定性较好,不会形成整体失稳,但会有局部变形,与震后实测现象一致。
When analyzing the stability of a landslide earthquake, it usually takes a fixed acceleration for the slide body, which neglects the propagation process of the seismic wave. The basic reason for the landslide destruction in the earthquake is that when the seismic waves propagate in the rock mass, the acceleration difference is formed between the sliding body and the sliding bed. The calculation formula of acceleration difference is deduced. Taking the landslide No. 3 of Yushu Airport Road in Qinghai Province as the prototype and the measured acceleration time history of Yushu Airport strong earthquake observatory as the input power, the time history curve of landslide dynamic stability coefficient is calculated by the transfer coefficient method. The results show that the stability coefficient of natural landslide is 1.269, the minimum dynamic stability coefficient is 0.962 and the minimum average stability coefficient is 1.069. The overall stability of the landslide is good, will not form the overall instability, but there will be partial deformation, consistent with the measured phenomenon after the earthquake.