Influence of heavy rainstorms on highway slope protection and countermeasures

We investigated 26 road slopes and slide fields in order to solve the highway road slope landslide problem in heavy rainstorms at Beijing-Chengde Expressway during 2011 and 2012. At the same time, we clarified the mechanisms of the landslide. The results showed that there were seven problems which caused road slope landslide, including slope vegetation layer landslide, six-arris floriation revetment washing out, slope collapse, slope slide and so on. Based on the analysis, we propose some countermeasures and suggestions, including improving the slope to drainage system in vivo and in vitro, avoiding large areas of confluence, reinforcing layers and slope by the net green vegetation and so on, for road slope protection. This paper would provide theoretical basis and reference for future road slope protection designs and emergency treatment for the landslide under storms.