Analysis Of Seepage Law And Reliability Of Waterproof Engineering In Regenerating Mine Groundwater Environment

How to achieve safe mining under complex hydrogeology conditions is the biggest common technical problem which large waterflow mine faces with. In order to ensure the safety of underground mining, hydrogeology of mining areas and engineering technological research on water control must be carried out scientifically and deeply to achieve groundwater environment regenerating of mining areas, so that geological disasters can be controlled effectively, territorial groundwater lowering can be prevented and dynamic balance of groundwater system can be maintained. The project of Xinqiao Mine in An Hui province, engineering of controlling water when turning open pit into underground mining was chosen as the research object. Comprehensively using some methods such as, spot monitoring, solid modeling and numerical stimulation. The law of seepage distribution before and after turning open pit into underground mining and adaptability and reliability of waterproof engineering structure were analyzed. The main research works are as follows:(1) Regional engineering hydrogeology survey was carried out systematically and detailed hydrogeology data of study area was obtained. Based on borehole data and modules of GMS, like Solids, hydrogeology structure mode of mining area was constructed which showed real geological environment directly and provided proof for precise division of hydrogeology conceptual model of regenerating mining area in next step.(2) Calculation analysis of open-pit rain runoff and water underground inflow when turning open pit into underground mining were finished with analytic method. Analysis results show that:Open pit rainfall is26.8times as much as underground inflow. Preventing surface water from infiltrating and reducing infiltration scope are the key link of water control in regenerating mining areas(3) Based on equivalent continuum mathematical model, hydrogeology conceptual model and numerical model of study area were built with GMS, groundwater seepage field analysis of study area after turning open pit into underground mining was carried out. The law of seepage distribution of study area was analyzed under the conditions of mining disturbance and surface rainfall infiltration and adaptability of regenerating waterproof engineering when turning open pit into underground mining was analyzed and evaluated. River closure effect of regenerating waterproof engineering is more obvious in the first phase project of turning open pit into underground mining.(4) Based on rough set and support vector machine theories, reliability evaluation model of regenerating waterproof engineering was built. Curtain thickness, character, permeability coefficient, rock mass porosity, hydraulic gradient, drawdown of underground water level, stone body strength and grouting depth were chosen as assessment factors. Reliable level of regenerating waterproof engineering was determined by simply extracting core identification index with knowledge on rough set and by calculating sample data and prediction data with support vector machine.