The Influence Research Of Highway Area Water Environment Caused By Subgrade Construction In Karst Region

Karst widely distribute in southwest region in our country, in this region the geologicalconditions is complicated and the water storage adjustment ability is low and the waterresources is poor. Along with the accelerated development of engineering construction insouthwest region, the phenomenon of water environmental impact damage happenoccasionally and even seriously threaten the local residents’life and production waterresources. At present, scholarsat home and abroad have already done the preliminary researchfor the water environmental effect of engineering construction, and obtained some researchresults, but the research aimed at highway area water environment influence of the karst areahighway subgrade construction is lacking. Therefore, this article relied on the constructingYanRu highway subgrade construction project, and combined with the methods of siteinvestigation, indoor tests , theoretical analysis and so on to have in-depth study on highwayarea water environmental impact assessment of subgrade construction, and obtained thefollowing main achievements:(1)Investigated the site actual hydrogeology situation and engineering geology situation ofYanRu highway and divided the highway area water environment into four categoriesaccording to karst water type, stored form and supplies runoff conditions.(2)Taked the hydrogeology, engineering geology, subgrade construction and culvertconstruction as the first level evaluation index, and choosed 15 impact assessment factors toestablish the impact evaluation index system of expressway water environment of subgradeconstruction.(3)Divided the influence degree of expressway water environment into five grade, andbased on fuzzy mathematics and grey theory to establish the fuzzy comprehensive evaluationand gray multi-level association analysis model of expressway water environment influenceof subgrade construction in karst area.(4)Used VB language to program the fuzzy evaluation software of expressway waterenvironment influence of subgrade construction in karst area, and preliminarily realized theintelligent and fast evaluation for expressway water environment influence in karst area.(5)The results of fuzzy evaluation and grey evaluation of highway area water environmentinfluence of subgrade construction of the 19th section of YanRu highway were consistent, andwas conform with the actual situation, which can validate the efficiency and reliability of thisartical evaluation methods.