某营运高速公路类土质边坡的稳定性分析及加固设计

Stability Analysis and Reinforcement Design for Soil-like Slope in Operating Highway

某高速公路类土质边坡表层为坡积土,下伏强风化—弱风化泥页岩,公路营运巡检中发现该边坡出现变形破坏迹象。对该类土质边坡变形破坏发展过程、成因及稳定性进行分析研究,研究结果表明,该边坡破坏形式为浅层牵引式滑坡,分别利用有限元强度折减法和瑞典圆弧滑动面法对边坡的稳定性进行分析计算,计算结果显示,正常工况下和非正常工况I(暴雨)下边坡都处于不稳定状态,经综合分析结合稳定性计算,提出采用封闭坡表裂缝+预应力锚杆格梁+仰斜排水孔进行治理,加固后的监测数据验证了边坡的稳定性和治理方案的可靠性。研究成果可为类土质边坡滑坡灾害防治提供参考。

The surface layer of a highway soil-like slope is colluvial soil,underlying strongly weathered-weakly weathered clay shale.It was found that the slope showed signs of deformation and failure in highway operation inspection.The development process,causes and stability of deformation and failure of this soil-like slope were analyzed and studied,the finite element strength reduction method and the circular sliding surface method were used respectively.The results show that the failure mode of the slope is a shallow traction landslide.The calculation results show that the slope is in an unstable state under normal conditions,and abnormal conditions I(rainstorm).Through comprehensive analysis combined with stability calculation,the closed slope surface cracks,prestressed anchor pile with beam,and inclined drainage holes are proposed for treatment.The monitoring data after reinforcement verifies the stability of the slope and the reliability of the regulation plan.The research results can provide a reference for the prevention and control of landslide disasters in soil-like slopes.