山区高速公路深挖路堑边坡失稳治理探讨

Discussion and Analysis on the Instability Control of Deep-excavated Cut Slopes of Expressways in Mountain Area

以某山区高速公路深挖路堑段不稳定边坡为研究案例,分析不稳定边坡产生的原因及滑动机理。研究认为,该不稳定边坡的形成主要是由于人为开挖破坏了原冲沟斜坡的稳定性,在降雨、基岩结构、岩层产状等内外因素的共同作用下,发生变形位移。研究通过削坡减载、增设抗滑挡墙、调整原设计中深挖路堑坡比及坡高等措施改善边坡不稳定状态,处治后边坡整体稳定,未产生新的滑动位移。

Taking the unstable slope of the deep-excavated cut section of the expressway in a mountain area as the research case,the causes and sliding mechanism of the unstable slope are analyzed.The research shows that,the formation of the unstable slope is mainly caused by the destruction of the stability of the original gully slope due to human excavation,and the deformation and displacement occur under the combined action of internal and external factors such as rainfall,bedrock structure,and attitude of bedrock and so on.The slope instability is improved by measures like cutting the slope and reducing the load,adding the anti-slip retaining wall,and adjusting the deep-excavated cut slope ratio and slope height in the original design,the slope is generally stable after treatment,and the new sliding displacement is not generated.