Risk assessment model of highway slope based on entropy weight set pair analysis and vehicle laser scanning

In order to evaluate the risk of highway slope more comprehensively, the set pair analysis theory and the ICP(iterative corresponding point) algorithm are optimized and improved; and then on this basis, based on improved entropy weight set pair analysis and vehicle borne laser scanning technology, a risk assessment model of highway slope combining the overall evaluation with the local evaluation is proposed. During the specific implementation, firstly according to the geological conditions, the highway slope is divided into several sections; and the overall evaluation is conducted by the improved entropy weight set pair analysis model; and the dangerous slope is found out. Secondly the vehicle laser scanning technology is used to obtain the point cloud data of two stages for every dangerous slope; and the improved ICP algorithm is applied to unmatched control of point cloud data of two periods for the dangerous slope; then, the slope surface models of two periods are built by non-Uniform rational b-spline(NURBS) technology and the local evaluation is carried out; and the specific danger point in the dangerous slope is found. Finally the evaluation results, expert opinions and field visits are summarized and analyzed; and the reasonable suggestions for disaster prevention and control are proposed. Taking a road in Xiuwu County for example, the experimental research is carried out by using this model. The results show that this model has exerted a good evaluation effect, not only the dangerous slope is determined, but also the specific risk points are found, so as to provide a new idea for the disaster prevention and mitigation of the highway slope.