基于离散元的废弃宕口边坡稳定性分析

Slope stability analysis of abandoned slope based on discrete element

为研究土质边坡的变形破坏模式,以苏州市科技城凤凰山弃土场边坡为主要研究对象,采用离散元数值模拟方法对其滑坡过程进行分析。研究结果表明:边坡的临界坡角为32°,此时边坡整体达到极限平衡状态。经实地踏勘,现场坡角最大值为58°。边坡由于蠕动变形,坡顶已出现明显的裂缝。通过离散元软件对这一现象进行分析。结果表明,在该工况条件下,随着时间的推移,边坡由最初的蠕动变形到最终形成稳定的圆弧形滑动面,颗粒最大位移达到10.4 m。边坡中部颗粒不断堆积,导致其正应力呈非线性增长,峰值应力达到115.24 kPa。剪应力在整个滑动过程中变化幅度不明显,坡脚的剪应力最大值为70.84 kPa。

In order to study the deformation and damage mode of the soil slope,the slope of the Phoenix Hill dump site in Suzhou Science and Technology City was taken as the main research object and its landslide process was analyzed by using the discrete element numerical simulation method.The research results show that the critical slope angle is 32°,which means that the slope as a whole reaches the limit equilibrium state.After site investigation,the maximum slope angle of the site is 58°,and the slope has obvious cracks at its top due to creep-slip deformation.This phenomenon is analyzed by discrete element software.The results show that under this working condition,with the passage of time,the slope forms a stable circular arc sliding surface from the initial creep-slip deformation,and the maximum displacement of particles reaches 10.4 m.The accumulation of particles in the middle of the slope led to a non-linear increase in the positive stress,with a peak stress of 115.24 kPa.The shear stress does not change significantly throughout the sliding process,with a maximum value of 70.84 kPa at the foot of the slope.