坡顶超载情况下的土坡影响因素敏感性分析

为了研究超载对边坡稳定性的影响,基于强度折减法分别计算了不同内摩擦角、粘聚力、土体重度、坡角、坡高、超载宽度、超载离坡肩的距离、超载大小等8种影响因素作用下土坡超载时的稳定性系数。并通过数值模拟,分析了土坡超载的破坏机理,结果表明：坡顶超载时,内摩擦角对土坡稳定性的影响最为显著,而超载宽度的影响最小。自重作用下边坡土体和超载作用下的边坡土体由于其自身强度不足而失稳的破坏机制有所不同：自重作用下失稳时,塑性区一般从坡脚延伸到坡顶;而当坡顶有超载作用下失稳时,塑性区一般从超载作用区域下和坡脚处同时扩展延伸并贯通,最终导致破坏。

Sensitivity Analysis on Soil Slope under Effect of Overloading on top of Its Surface

In order to study the effect of overloading on the slope stability,internal friction angle,cohesive,soil weight,slope angle,slope height,overloading width,the distance of overloading from slope shoulder,overloading size are calculated basing on the strength reduction.And through the numerical simulation,this paper analyzes the failure mechanism of soil slope under effect of overloading,and the results show that when soil slope under overloading,the effect of internal friction angle on the stability of slope is the most significant,and the effect of overloading width minimum.The failure mechanism of instability of soil slope under the effect of gravity is different from the effect of overloading due to their own shortage intension： under the effect of gravity,generally the plastic zone extends from foot to the top of slope;but when under the effect of overloading on its surface,the plastic zone under the overloading area and the plastic zone at slope foot extend at the same time,and ultimately lead to destruction.