The White The Xiangshan Complex Rich Ferrihydrite Water Inrush Risk Analysis And Evaluation

The construction and mining of a complicated water-rich iron mine is often endangered by water-inrush geologic hazards. So, the water-inrush is a difficult problem which desiderates to be solved effectively as soon as possible. Relying on the "the development and study on the crucial technology of exploring the complicated water-rich mine" (NO. 2006BAB02A01), one of the national "11th Five-Year" science and technology supporting projects, on the basis of systematical deep analysis of the geohydrologic conditions in the typical complicated iron mine of Baixiangshan, the thesis has applied the fuzzy mathematics method to the comprehensive evaluation research on the partition of inrush risk of the horizontal developing tunnels(-495m,-450m and-390m) of the mining area, and established "The system of surrounding strata in stope" of the the mining area by the numerical simulation software of fluid-solid coupling mode of FLAC3D. The system is a three dimensional numerical model under the condition of seepage conditions. The thesis has explored and studied the optimization methods of stope structure parameters, and the stope roof stability under the condition of different buried depth, different earth pressure and different roof thickness, as well as the influential action laws of inrush risk. The above research can provide the theoretical and practical help for prevention and control ground water of the water-rich deposit. The main works and contents are as fllowed:(1) On the basis of the comprehensive analysis of effect factors of the inrush risk, fuzzy mathematics methods are used to establish the model of water-inrush risk assessment,and the synthetical analysis and evaluation are performed. So,the variation laws of water-inrush risk of the three levels (-495m,-450m and-390m) has been ascertained, and subarea evolution maps have been completed.(2) Based on the fluid-solid coupling mode of 3D-dimensional finite-difference codes method for fluid flow in porous media, combining with the specific complexions, on the background of backfill.mining under pressure under the condition of local drainage in underlayer, orebody mining under the "scuttle", which is between north of the exploration line 4 and south of the exploration line 7, is abstracted as the geologic model, and "The system of surrounding strata in stope" of the the mining area, which is a three dimensional numerical model under the condition of seepage conditions, is set up. According to the orthogonal experimental design methods, the mining Simulation Solutions of nine stope structural parameters, which are confirmation of different mining spans, access widths, Layered mining heights and type of filling mass, are formulated. The valuation of the stability of the mining roof is marked by the largest settlement, the maximum tension stress and the failure height of the plastic zone. Finally, the best solution is confirmed by different simulated results.(3) Based on the mining conditions of the optimized and determined stope structure parameters, in different depth (head pressure and vertical stress), on different roof thickness of angular rock of sandstone and lateral pressure coefficient condition that numerical simulation study of stability of the stope, and quested and analyzed the influence of defferent burial depth, thickness of the stope and lateral pressure coefficient on stability and water risk.(4) Based on the achievement in the water-risk evaluation and numerical simulation study, combined with the particular case of Baixiangshan iron, discussion and proposed a mainly hydrogeological problems of general prevention measures and measures in mining area. And to direct at the Baixiangshan iron that mainly faced with specific flood, selected roadways and ore mining in water broken fault zone of gushing water cure problems, in the "scuttle " that the mining exploration under pressure, the roof instability, gushing water cure problems and adverse plugging holes of the water control on three specific water issues, analysis and discusses its role of current situation and discipline, and with regard to these problems of research results and knowledge, to explore and summarizes for the Baixiangshan iron ore to the specific situation of effective prevention methods and measures.