RISK CLASSIFICATION METHOD FOR HIGH CUT SLOPES OF HIGHWAY IN MOUNTAINS OF FUJIAN PROVINCE

This paper aims to research risk classification for high cut slope during design stage, arrange project investment reasonably and control risk in slope engineering. The classification is based on analysis principles of slope engineering geology and correlative experience summary or feedback analysis, through the analysis of terrain conditions, geological conditions, meteorology and hydrology, and other factors. As a result, the evaluation index system of risk factors for the cut slope is built. It then clears the significance of each evaluation index and determines its risk rating criteria. The system is applied to the risk evaluation of the 71 high slopes along Shuangyong Expressway in Yongding Country. A risk classification method of high cutting slopes during design stage is established. Firstly, an assessment value of each factor is determined according to the survey and design results. Secondly, using analytical hierarchy process, the weights of factors are calculated. Thirdly, 4 different risk classes are divided and the relative countermeasures are proposed to prevent and control risk. Furthermore, the system is applied to evaluation of the K227 landslide and other two low failed slopes. The result shows that this risk classification method is reasonable and feasible, and has evident advantage of avoiding omissions for selecting dangerous slopes. The findings demonstrate this highway is the best section of risk control in construction process and operation period although it has the most complex slopes along the whole highway.