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针对黄土地区某一高速公路出现的高填方路堤滑坡进行了理论及数值模拟研究,重点分析了滑坡的发育特征、滑坡形成的机理及综合控制措施。结果表明:黄土下卧层的不均匀湿陷性沉降是该路堤高边坡产生滑坡的根本原因;因填土的弱膨胀性产生的龟状裂缝、靠山体一侧砂岩发育的基岩裂隙的存在,形成了地下水向黄土层汇集的客观条件;边坡首先在靠近临空面一侧填土产生不均匀性沉降,最终牵引边坡靠山一侧产生整体滑移,边坡滑移具备牵引式滑坡的特征;结合不同路段路基边坡的地形条件,综合采用了反压填土、抗滑桩及抗滑挡墙的支护措施,取得了良好的控制效果。
Aiming at the high embankment landslide appeared on a highway in the loess area, theoretical and numerical simulation studies are carried out. The development characteristics of the landslide, the mechanism of landslide formation and comprehensive control measures are analyzed. The results show that the non-uniform collapsible settlement of the subsoil of the loess is the root cause of the landslide on the high side of the embankment. Because of the turtle-shaped crack caused by the weak expansion of the embankment, the bedrock fissures The formation of groundwater to the loess layer of the objective conditions of convergence; first slope near the surface of the fill side of the ground with uneven settlement, the final pull side of the slope to produce a sliding overall slope slip with traction Landslide characteristics; combined with the topography conditions of subgrade slope in different sections, comprehensive countermeasures of backfill filling, anti-slide piles and anti-slide retaining wall are adopted, and good control effects are obtained.