雨水反复浸蚀对露天矿边坡稳定性影响分析

摘要

为了研究雨水反复浸蚀作用对边坡稳定性的影响,根据不同强度的降雨,对边坡台阶和坡面进行雨水浸润范围的划分,利用ABAQUS有限元软件并采用更有效的参数折减方式对雨水的反复浸蚀作用进行模拟.结果显示:采用经过调整的参数折减方式使得内摩擦角的折减路径更贴近反正切函数曲线;在划分边坡浸润区后,经过强度折减,边坡主要沿着坡面浸润区发生破坏.虽然边坡内部大多都在强度范围之内,但边坡的安全系数逐步越低;随着边坡浸润区范围的扩大,坡脚处的塑性区域逐渐减小,边坡也从整体失稳破坏过渡到局部浸润区产生滑移体,不会再产生传统的塑性贯通区.%In order to study the influence of repeated erosion of different degree rainfall on slope stability,the steps and slopes of the soil slope are divided into different rainfall infiltration range. The finite element method and new strength reduction method based on ABAQUS software are used to analyze the repeated erosion of rainfall on the slope. The results show that the reduction curve of the internal friction angle is more consistent with the inverse trigonometric function curve by using the new strength reduction method;the failure region is mainly along the slope infiltration area after the division of the slope infiltration area. Although the most area of the slope is within the intensity range,but the slope of the safety factor is gradually reduced. The plastic zone seated in the foot of the slope is decreased gradually with the increasing of the slope infiltration area,and the failure mode of the slope is changed from the overall instability to the local slip failure in the infiltrating zone,and the plastic penetration zone would not be occurred.