多级斜坡路基软弱地基变形机理和稳定性数值分析

山区公路路基往往是在斜坡上填筑的,这种填筑形式更易于发生变形破坏,故本文以某斜坡路基为研究对象,研究斜坡路基地基变形机理,并用强度折减法分析该斜坡路基的稳定性。结果表明:①地基形变的总体趋势以沉降变形为主,随填筑高度的增加,水平位移逐渐趋于均匀,并表现为侧向外鼓,沉降最大值集中在与填筑体中心相交的区域。②路基中心的最终沉降位移相较于坡脚的2倍;路基整体有向斜坡下滑移的趋势;短坡脚的水平位移发展最快。③斜坡路基随填筑高度的增加,从深层滑动发展为浅层滑动,滑体集中于长坡脚。④随填筑高度的增加,安全系数逐渐降低。

Numerical Analysis of Deformation Mechanism and Stability of Multistage Embankment over Sloped Weak Ground

The mountain embankment is often filled on the slope,this form of filling is more prone to deformation and damage,so this paper takes a slope subgrade as the research object to study the deformation mechanism of slope subgrade base and analyze the stability of the slope subgrade by strength reduction method.The results show that:①The general trend of foundation deformation is mainly caused by and settlement.With the increase of the filling height,the horizontal displacement gradually becomes uniform and shows the lateral drum,as well as the maximum settlement is concentrated in the filling center intersecting area.②The final settlement displacement of the embankment center is 2 times higher than that of the slope toe;the overall trend of the embankment slopes is inclined;the horizontal displacement of the short slope toe is the fastest.③With the increase of filling height,the slope subgrade develops from deep sliding to shallow sliding,and the sliding body is concentrated in the long slope foot.④With the increase of filling height,the safety factor gradually decreases.