岩层与边坡走向小角度相交老滑坡复活机理

Resurrection Mechanism of Old Landslide Caused by the Small Angle Intersection of Stratum and Slope Trend

本文针对某高速公路边坡岩层走向与边坡走向小角度相交的老滑坡复活现象,在前期线路勘察设计的基础上,充分分析并采用地表工程地质测绘、地质钻探相结合的工作方法,为边坡治理设计和施工提供必要的工程地质依据。研究结果表明,研究区段边坡岩层走向与边坡走向呈小角度相交,加之强风化板岩中发育有泥化夹层,造成边坡岩土体由于坡脚开挖而顺泥化夹层发生滑坡或老滑坡大规模复活。

Aimed at the resurrection of the fossil landslide caused by the small angle intersection of rock slope trend and slope trend,this paper adequately analyzes and uses the combination of surface geological surveying and mapping and the geological drilling based on the preliminary route survey and design to provide the necessary engineering geological basis for the design and construction of slope management. The results show that, there is a small angle intersection between the rock slope trend and slope trend in the study section,and there is the siltized intercalation in intense weathering slate. That causes the large resurrection of the argillization interlayer in geotechnical slope by the excavation of slope toe.