外力对斜坡稳定性影响的数值模拟研究

风载等外荷载传递至基础后,将对斜坡地基的稳定性造成影响。采用将外荷载当作是集中力作用于基础中部的思路,来模拟外荷载对斜坡稳定的影响。通过设置不同集中力作用的方向,以求模拟由于外界环境变化引起的各类外荷载的作用,并分析规律。利用有限差分软件FLAC3D,结合强度折减理论,可将模型内部的应力、变形的变化过程显示,并可按一定标准判定安全系数和滑动面形态。计算结果表明:作用于水平方向和垂直方向的集中力对斜坡稳定性均有影响,指向斜坡的水平力对稳定性的影响较大。指向斜坡内部的集中力可提高斜坡地基的稳定性。

NUMERICAL SIMULATION RESEARCH OF THE INFLUENCE OF EXTERNAL LOADS ON SLOPE STABILITY

External loads, such as wind load, transferring to the foundation, will impact stability of slope ground. This paper takes the external loads as concentrated force on the middle of the basis to simulate the impact of the external loads on slope stability. And it sets different directions of concentrated forces to simulate the role of all kinds of external loads in different environmental conditions and analyzes the law. The method utilizing the finite difference software - FLAC3D, and combining shear strength reduction theory, can demonstrate the process of the internal stress and deformation changes, and can determine the safety factor and the shape of landslide based on certain criteria. The calculation results show that both horizontal and vertical concentrated forces impact slope stability and the horizontal concentrated forces have a greater impact on the slope stability. Concentrated forces that point to the inner of slope can strengthen the stability of the slope ground.