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静力计算认为稳定的边坡,在地震发生时,由于潜滑体被施加动力荷载,加之孔隙水压力上升,岩土体的抗剪强度降低,导致拟滑动面抗滑力下降,将可能是不稳定的。因此,重要的边坡问题,仅进行静力计算是不够的。以奉节长江大桥北岸边坡为例,在工程详勘及场地地震危险性分析的基础上,采用传递系数法对边坡在地震荷载作用下的稳定性进行了计算分析,对比了现状边坡工况与175 m水位线边坡工况下静、动力稳定性的差异。
In the static calculation, a stable slope is considered as a stable slope. When an earthquake occurs, due to the dynamic load applied to the submarine body and the increase of the pore water pressure, the shear strength of the rock mass decreases. As a result, the slip resistance of the pseudo-sliding surface will decrease unstable. Therefore, it is not enough for the important slope problem to do only the static calculation. Taking the north bank slope of Fengjie Yangtze River Bridge as an example, the stability of the slope under seismic load is calculated and analyzed by means of transmission coefficient method based on the detailed engineering survey and the site seismic hazard analysis. The current status of the slope Variation of Static and Dynamic Stability of Slope under Condition of 175 m Water Level and Condition of Slope.