广惠高速公路路堑高边坡变形原因分析及治理措施

由于降雨造成原设计工程发生变形破坏、地表水下渗浸泡产生膨胀变形以及自身黏土质岩类受各种作用产生的位移变形,导致广惠高速公路路堑高边坡发生变形破坏现象。边坡在平行和垂直于道路的方向有分离、倾斜的现象,坡体上有较明显的裂缝,并且部分锚索的钢绞线被拉断从锚头端飞出,需要对原边坡进行治理。通过边坡稳定性分析,计算得出边坡在天然工况和暴雨工况下的安全系数分别为1.135和0.989,表明边坡安全储备不足,已发生失稳破坏。对其采用预应力锚索、随机锚杆、微型注浆钢管以及地梁等对原边坡进行再加固处理,同时修复整个边坡的排水系统。通过治理效果良好,满足运营要求。

Analysis on Deformation Causes and Treatment Measures of High Cutting Slope in Guangzhou-Huizhou Expressway

Due to the deformation and destruction of the original design project caused by rainfall, the expansion deformation caused by surface water infiltration and soaking, and the displacement deformation of the self-clay rock by various actions, the deformation and failure of the high cutting slope of Guanghui expressway occurred. The slope is separated and tilted in the direction of parallel and perpendicular to the road. There are obvious cracks on the slope, and some strand cables are broken off from the anchor ends, so the original slope needs to be treated. Through the stability analysis of the slope, the safety factor of the slope under natural conditions and rainstorm conditions are 1.135 and 0.989 respectively by calculating. It indicates that slope safety reserve is insufficient, and instability failure may occur. The pre-stressed anchor cable, random anchor rod, micro grouting steel pipe and ground beam are used to reinforce the original slope, and the drainage system of the whole slope is repaired at the same time. Good effect is achieved through the treatment measures and it meet the operation requirement.