贵州山区路堑边坡失稳机理与处治对策

Instability Mechanism and Treatment Measures of Cutting Slope in Guizhou Mountainous Areas

贵州山区地质条件复杂,降雨量大,路堑边坡的稳定对道路安全影响重大。文中以贵阳市某道路工程为依托,分析边坡失稳破坏的主要类型,总结出四类风险较大的路堑边坡,即土质边坡、顺层岩质边坡、岩土混合边坡和超高边坡,明确主要破坏形式为圆弧形滑动、沿层面平面滑动、沿土岩分界线折线滑动、岩体屈服-崩塌。结合破坏机理及实际,明确边坡防护可采用放缓坡率、抗滑桩、格构锚杆(索)、挡墙等形式,辅以边坡截排水,以保证边坡稳定。

With the complex geological conditions and heavy rainfall in Guizhou mountainous areas,the slope stability in road construction has great influence on road safety.Based on a road engineering project in Guiyang,the main types of slope instability are analyzed and four types of cutting slopes with high risk are summarized,including soil slope,bedding rock slope,rock-soil mixed slope and super high slope,and the main failure modes are concluded as follows:circular sliding,planar sliding along rock formation planes,broken line sliding along soil-rock boundary and rock yield-collapse.Combined with the failure mechanism and practice,slope protection can adopt the measures of gentle slope rate,anti-slide pile,lattice anchor(cable),retaining wall,etc.,supplemented by slope interception and drainage system to ensure the stability of the slope.