Research On The Hydrogeological Characteristics And The Hydrogeological Element Divided Of Jurassic Coalfield In Northern Shaanxi Province

The mine water hazard was an important problem which perplexes the coal mine safety production inChina. The ambiguous coal mine hydrogeological conditions, and ignore the importance ofhydrogeological work were the common characteristics when the coal mine water hazards occurred. Poorunderstanding of the hydrogeological characteristics and groundwater systems together with uncleardelineation of the hydrogeological units are the main factors leading to the ineffectiveness of mine watercontrol measures, which poses a serious threat on mine safety production, it is the key precondition whichthe scientific prevention and control of coal mine water hazard.The research object of this thesis is the Jurassic Coalfield in Northern Shaanxi Province. Based oncollected geological data, this thesis analyzed the geological and hydrogeological conditions, summarizedthe hydrogeological characteristics, and analyzed the recharge, runoff and discharge conditions of the mainaquifer, impermeable layer and groundwater, as well as water-filled conditions and the possibility of waterhazard. According to relevant guidelines and results, we divided each level of underground water system.Choose the typical hydrogeological units to the proximate grade division, which formfive aspects such as landform, formation lithology, geological structure, and the watery ofaquifer, form of the top of bedrock. The results indicate that the hydrogeological element inthe region are controlled by regional geological conditions, hydrogeological conditions,ancient depositional environment, spatial characteristics of stratum, structural conditions andmodern topography, etc; the location of ancient river and relatively water-rich area of theaquifer is determined; based on the contours of bedrock surface, confirm the location of thefossil river course and the groundwater watershed.Carry out qualitative analysis of groundwater system in the study area, combine withrelevant experience, select the appropriate evaluation set, establish fuzzy comprehensive evaluation model, further divisions for typical hydrogeological units by use of the AnalyticHierarchy Process. The traditional qualitative analysis and quantitative calculation of modernmutual complement and perfect, then make the divided results conform to reality better.