Study On Optimal Route Selection Of Road On Goaf Based On Optimal Route Analysis Of GIS

Chinese Highway construction has developed very rapidly in recent years. Construction on mine goaf is inevitably. As a special kind of geotechnical problems, mine goaf brings special difficulties to Highway construction. So, research on stabilization estimation of mine goaf and security, economic and reasonable route selection on the highway alignment stage has important economic and social significance.The model of goaf comprehensive evaluation is constituted by the Fuzzy comprehensive evaluation. Then the model of route selection optimization of road on goaf is established by using optimum route analysis of GIS. Optimal route is found and used to apply reference for the next stage of route selection. Research achievements are as follows:1. On the base of summing up the results of previous studies and experience, factors on goaf stabilization are analyzed. The model of goaf comprehensive evaluation in which time and construction affect are first taken into account is constituted by the Fuzzy comprehensive evaluation. It is used to estimate the stabilization of existing goaf in the route selecting range, and support route selection on goaf.2. The model of route selection optimization of road on goaf is established by using optimum route analysis of GIS. Include:(1) Factors on goaf route selecting are analyzed. Five main factors are selected including goaf, geology, elevation, slope and buildings. Weight of them is analyzed by Analytic Hierarchy Process;(2) Digital model of each factor are established in GIS. Single factor cost model is generated by route suitability evaluation. And comprehensive cost model is generated by calculating single factor cost model with weight. Optimal route is seeked by the shortest path anaysis of GIS on the base of comprehensive cost model;(3) Suitability analysis model for bridge and tunnel location is established by the first time on the base of analysis of characteristics and principles in bridge and tunnel location;(4) The experimental results show that the application of this model on route selection of road on goaf is feasible and reliable.