软岩区厚层堆积体公路高切坡变形机制及其支护技术

Deformation Mechanism and Support Technology of Highway High Cutting Slope with Thick Accumulation in Soft Rock Area

降雨易沿堆积体土体孔隙下渗至软岩强风化层,并在中风化线以上汇聚赋存。针对软岩区堆积体公路边坡滑塌病害频发的现状,以重庆某高速公路50 m高页岩与块石土混合高切坡变形体为例,从项目区地形地貌、地层岩性、地质构造、水文地质及病害形态等方面对边坡变形机制进行了深入和系统的分析。结合变形体区内边界条件及影响因素,针对性的提出了一种经济性和安全性最优的综合处治方法。采用该方法处治后的高切坡变形体历经多年的雨季检验,安全稳定无变形,可为类似工程提供参考和借鉴。

Rainfall tends to seep down along the pores of the accumulated soil to the strong weathered layer of soft rock,gather and accumulate above the weak weathering line.In view of the frequent occurrence of collapse diseases of accumulation highway slope in soft rock area,a 50-meter-high shale and rock-soil mixed high-cut slope deformed body of a certain expressway in Chongqing was taken as an example.the deformation mechanism of slope was deeply and systematically analyzed from geomorphology,stratigraphic lithology,geological structure,hydrogeology and landslide morphology.Combined with boundary conditions and influencing factors in deformed body area,a comprehensive treatment method with optimal economy and safety was proposed.The high-cut slope deformed body treated by this method has undergone many years of rainy season inspections and is safe and stable without deformation,which can provide reference for similar projects.