Study On Water Inrush Geomechanical Condition And Its Water Inrush Risk Of Coal Roof And Floor

?????????????????????,???????????????????????????????????????????,??????????????????????,???????????????????????,?????????????????????????????????????????????????????????????????,????????????????????????????????????????????????????,????????????????????????????????????????????????(????)?????????,?12??????????????????????????????????????????????????????????,?.????????12?????????12-2???????????????????,??????????????????????“???????”??????????Water inrush is an important factor in coal mine safe exploitation. Therefore, study on water inrush theory and prevention of coal roof and floor had a great significance. This dissertation based on Fangezhuang coal mine and Donghuantuo coal mine in Kailuan coal mine area, applied the multidisciplinary theory of rock mechanics, hydrogeology, fuzzy mathematics, combined with research methods, such as rock mechanics test, numerical simulations and statistical analysis, analyzed systematically the factors of coal roof and floor water inrush fundamental geology factors including aquifer condition, aquifuge medium condition and fracture structure condition. The rock mechanics properties of coal roof and floor, such as lithology, lateral pressure and water, were mainly researched. The correlativity had been established between rock mechanics properties and those parameters. In-situ stress characteristic in Kailuan coal mine area and its controlling of water inrush was researched. The substance of in-situ stress controlling of water inrush was to relationships between water pressure and rock fracture pressure and between water pressure and the minimum principal stress. On the basis of the actual hydro-geological conditions of a particular coal mine like Fangezhuang, exploited No.12 coal mine nearby fault with different water conductivity and connectivity of different aquifer waterproof coal pillar reasonable design width was been defined by using theoretic calculation and numerical simulation. Using the fuzzy comprehensive assessment method, water inrush risk evaluation for No.12 coal floor of Fangezhuang coal mine and No.12-2 coal floor of Donghuantuo coal mine were evaluated. Finally, method of coal mine exploitation based on protective layer permeable coefficient under extremely thick unconsolidated strata under higher water pressure was put forward.