考虑竖向地震作用下库岸边坡稳定性研究

摘要

It takes vertical earthquake reaction into consideration, and simultaneously considers dynamic variation of anti-sliding strength and pore pressure, and finally induces the calculation formula of the stability adapting to mansard landslide, and verified the feasibility combined with the Fengjiaba landslide in Wushan county, Chongqing, China, in the Threee Gorge Reservoir. The result shows that the stability will reduce about 4% when considering vertical seism, and with the increase of earthquake intensity, reduce more obviously. Especially, in the 7 intensity, the stability reduces more than 20%, it has important effect to slopes of coast in reservoir＇ s bank in the state of limit equilibrium and must to be pay more attention for them.%考虑了地震过程中竖直地震力的作用，同时考虑抗滑强度和孔隙压的动态变化，推导出适用于折线型滑坡稳定性计算公式，结合三峡库区巫山县冯家坝滑坡实例，验证了公式的可行性，结果表明，当考虑竖向地震荷载作用时，滑坡的稳定性降低4％左右，随着地震烈度的增加，滑坡稳定性降低更加明显，在7度烈度下，稳定性降低超过20％，对于处于极限平衡状态的库岸边坡具有重大影响，对于地震区库岸边坡必须加以注意。