Research on overall risk assessment and its application in high slope engineering construction

Abstract

Due to the special landform and physiognomy in the mountain highway construction, it’s often necessary to excavate of road cutting in a complex geological environment, including high and steep slope. And the security of cut slope in construction has a deep influence on the normal development of the whole project. Whether the construction of high slope engineering is safe or not depends on many uncertainty factors. Generally, the sole safety factor can’t deal with these uncertainties. Therefore, in the course of construction operation, analyzing and assessing the risk of slope engineering to avoiding and reducing risk is substantial. According to the characteristics of the slope engineering projects, considering to the experience of this kind of project management, the engineering geological conditions, site conditions, the height of slope and climate conditions were chosen as the overall risk assessment indicators of high slope engineering in the construction safety, and demonstrate the rationality of selecting the indicators in detail. Afterwards, based on the knowledge of probability theory and mathematical statistics, the scores of overall safety risk of construction can be divided into four levels, then evaluate the criticality of slope construction quantitatively and thereby provide scientific decision-making basis for different risk rank of slope engineering to take corresponding risk control measures. Furthermore, the special risk assessment of construction safety is suggested to the high slope engineering whose overall risk rank is level III and over. At last, based on Hubei Yunshi highway which is being constructed, the overall risk assessment on the construction of cut slope engineering was made and suitable evaluation result was obtained. Then compared with the actual construction situation, found evaluation results and actual situation are keep in coincide. So the effectiveness of the risk assessment system is verified.