梧柳公路顺层滑坡稳定性分析及治理措施

Analysis on Stability of Bedding Landslide and Treatment Measures in Wuzhou-Liuzhou Expressway

针对梧州至柳州高速公路K97+300^+500段开挖顺层边坡引发的滑坡,对滑坡的发展过程、变形破坏特征等进行调查研究,并对产生滑坡的机理进行了深入分析。鉴于边坡岩体顺层,且第1级边坡局部有薄层炭质页岩的易滑软弱夹层,在前缘开挖临空后易产生顺层滑坡,边坡施工开挖后一直处于蠕动变形状态,若采用矩形抗滑桩需人工挖孔,施工安全风险大,还面临竣工通车的工期压力,因此采用旋挖钻机成孔的双排预应力圆截面抗滑桩+钢花管注浆+锚杆框架植草护坡+浆砌片石护面墙+排水等治理措施。

In view of the landslide caused by excavation of bedding slope in K97+300^+500 section of Wuzhou—Liuzhou expressway,the development process,deformation and failure characteristics of landslide are investigated and studied,and the mechanism of landslide is analyzed in depth.Considering the bedding of the slope rock mass,and there is a thin layer of soft intercalation of carbonaceous shale in the local part of the first grade slope,bedding landslide is easy to occur after the excavation of the front edge.The slope has always been in creep deformation state after excavation.If rectangular anti-slide pile is used,it needs manual hole digging construction,which will cause great construction safety risk and also face the construction period pressure of completion and opening to traffic.Therefore,double row prestressed circular cross-section anti-slide pile formed by rotary drilling rig+steel flower pipe grouting+anchor bar frame grass planting slope protection+mortar rubble facing wall+drainage and other treatment measures are adopted.