考虑竖向地震力的极震区滑坡稳定分析

The Analysis of Stabilization on Landslide at Meizoseismal Area with Vertical Force

以"5.12"汶川8.0级特大地震为契机,对极震区内的地震动特点进行分析,结合极震区内滑坡的破坏特点,并运用剩余推力法对同时考虑水平向和竖直向地震力的滑坡进行算例分析。对竖向地震力与水平向地震力的大小、比值与滑坡稳定性的关系进行了分析。发现Kv与Kh的比值越大,坡体失稳的机率迅速增大,Kv与Kh的比值越小,稳定系数曲线的弯曲程度越大。在比值一定时,0.4g的水平地震力,成为稳定系数变化的关键点。在同时考虑水平向和竖向地震力的情况下,这些潜在滑坡的稳定性受控于这两种地震力的大小和比值。

On the basis of analyzing the ground motion and the character of landslide failure at meizoseismal area,the example of landslide with horizontal and vertical super earthquake inertia forces was calculated using residual thrust method.The relationship between landslide safety and size、ratio of vertical and horizontal super earthquake inertia forces were analysized.The failure of landslide will be more easier,when the radio of Kv and Kh becomes larger.The change of landslide safety coefficient curve is reverse to the radio of Kv and Kh.When the horizontal earthquake inertia force is 0.4 g,that is the sticking point of safety coefficient curve.So the safety of landslides are controlled by the size and radio of the two kinds of earthquake inertia forces.