Research On Cost Evaluation Method And Application Of In-site Road Alignment Of Hydropower Station Based On AHP And GIS

With the sustainable development of hydropower in western China,the center of gravity of Hydropower Project will move further westward.The construction of hydropower stations will face many technical challenges due to the extremely complex natural conditions such as topography and geology in the western mountainous areas.As the most basic road engineering in hydropower project,the selection of road route in hydropower station has a direct impact on the construction period and benefit of the power station.It is a multi-objective and multi-factor decision-making problem that the road alignment should consider not only the natural factors such as terrain,but also the human landscape and ecological environment along the route.Road cost evaluation can consider all kinds of influence factors synthetically,and transform the influence factors of different dimensions into line selection cost,which is the basis of road alignment,and has important theoretical and practical value for road alignment designIn this paper,a road alignment index system is constructed based on AHP,which takes into account the characteristics of the road in the hydropower station,and several factors affecting the selection of the road,the cost calculation model of in-site road alignment is constructed to provide basis for road alignment.The main research contents of this paper include:1.The main influencing factors of on-site road of Hydropower Station are determined: the characteristics of on-site Road of Hydropower Station are comprehensively analyzed,the factors influencing on on-site road of hydropower station are summed up in detail and comprehensively,the determination of the road in the hydropower station is divided into two stages ——before and after the alignment,and the corresponding factors affecting the alignment are divided according to the different stages.2.The index system of on-site road alignment is determined: Using analytic hierarchy process(AHP),organize the influencing factors of on-site road alignment,construct the index system of on-site road alignment,and refer to the existing research to determine the weights of each index in this paper.3.The cost calculation model of road in Hydropower Station is determined: Based on the spatial data structure and spatial analysis function of Gis,the grid data is selected to calculate the cost of road alignment,the cost calculation model of single-index route selection is built,and the cost calculation model of road route selection is built by superimposing and analyzing the single-index cost layers.4.Research on engineering application: A mountainous region of a hydropower station in China is selected as the research object.The experimental results show that the method and model proposed in this paper can realize fast and efficient route selection,greatly reduce the cost of human and material resources,and has a certain practical value.