山区公路单斜坡回头曲线路段滑坡成因及治理方案研究

Study on Genesis of Landslide along Monoclinal Slope Switch-back Curve Section of Mountainous Highway and the Control Measures

针对山区某二级公路滑坡,基于其地形地质条件及监测数据,确定了单斜坡回头曲线路段滑坡成因及类型,从被动支挡和主动避让两方面提出治理思路,经技术经济比较后确定了最优方案,并作出治理效果评价。结果表明:山区公路选线不能片面地追求高标准,应充分进行地形地质选线;滑坡治理方案选择应综合被动支挡、主动避让、减轻、转移等思路进行考虑;抗滑桩支挡+下滑段减载是治理推移式滑坡的有效手段之一;对滑动面未明确的滑坡体,监测时充分利用监测孔埋设测斜管进行深层位移测量,确定滑动面。

In relation to the landslide along a second-class highway in mountainous area,the genesis and type of this landslide along monoclinal slope switch-back curve section were determined depending on its topographic and geological conditions and monitoring data.It was thought to control from passive retaining and active avoiding and then,with the comparison in terms of technology and economy,optimal scheme was determined,and the treatment effect was evaluated.The result shows that,for mountainous highway,the route selection should not take one-sided stringent specification,but topographic and geological conditions into consideration;the ideas,such as passive retaining,active avoiding,relief and transfer,should be combined together for the landslide control;anti-slide pile with deloading in downslide section is one of the effective means to control thrust load caused landslide;for the landslide mass with unclear sliding surface,inclinometer tube is buried in monitoring holes to measure deep displacement so as to determine the sliding surface.