Abstract:

 According to the geo-engineering problems in the alternative lines of the Lijiang-Shangri-La railway section of the Yunnan-Tibet railway, the paper comprehensively analyzed the factors of the regional geological setting and topography, the rock group of engineering geology, the slope structure, geo-hazards developing status, the earth’s crust stability, the human engineering activities, the precipitation and the distance to the valley, and established the analytic hierarchy process (AHP) and mathematical models according to the expert scoring. The paper established the computational formula of engineering geological condition index and calculated the impact factor weights, and made the engineering geological condition zoning based on the ArcGIS 9.2 platform. The calculation results show that the engineering geological conditions are mainly poor and medium in the study area. Based on the results of the engineering geological zoning and real data analysis, the paper made optimization of the southern segment of Lijiang-Shangri-La railway line. The research methods and conclusions in the paper are of good guiding and reference to the construction and planning of the project in the study area.

Key words: analytic hierarchy process (AHP), geographic information system (GIS), engineering geological evaluation, railway route selection, Yunnan-Tibet railway