边坡坡形对公路土质边坡稳定性影响分析

影响公路土质边坡稳定性的坡形要素主要为坡度、坡高和断面几何形状,文章根据国内外理论研究和公路路基设计规范将每个坡形要素分为若干个水平标准,基于Flac3D建立三维公路边坡模型,讨论三维模型建模尺寸等问题,采用强度折减法计算边坡安全系数,并通过观察塑性区贯通以及边坡整体位移情况分析不同坡形要素与边坡稳定性的变化关系。结果表明:土质边坡稳定性随着坡度的增大、坡高的增大而逐渐减小;当边坡坡高大于8m后需要对其进行分级处理,稳定性随着分级台阶宽度的增大、分级坡率的放缓呈现不同程度的增大。

Analysis of the Influence of Slope Shape on the Stability of Highway Soil Slope

The slope shape factors that affect the stability of highway soil slopes are mainly slope, slope height and section geometry. This article divides each slope factor into several levels based on domestic and foreign theoretical research and highway subgrade design codes, builds a 3D highway slope model based on Flac3D, discusses the modeling dimensions of the 3D model, calculates the slope safety factor using strength reduction method, and analyzes the relationship between different slope shape factors and slope stability by observing the penetration of the plastic zone and the overall displacement of the slope. The results show that the stability of soil slope decreases with the increment of slope gradient and slope height. When the slope height is greater than 8 m, it needs to be classified, and the stability increases with the increase of the width of the step and the slowdown of the slope rate.