Research On The Form Mechanism Of Goaf Water And Its Waterproof Coal Pillar Dimension Problem In Coal Mine

Basic characteristics of mine goaf water were studied in detail by theories and means of geology, hydrogeology, mine pressure and numerical simulation in this dissertation. The research is carried on the basis of the field cases of Huainan Panyi Coal Mine, Xieqiao Coal Mine, Zhangji Coal Mine, Kongji Coal Mine and Xinzhuangzi Coal Mine. The classification principle and modes of goaf water accidents in working faces were put forward based on their accidents investigation. By the analysis of the supplied water-source, the supplied water-pathway, and the accumulated water-inter space, the mechanism of goaf water was studied systematically. The optimization analysis on the goaf waterproof coal pillar dimension under mining was studied with the numerical simulation modeling. The prediction means of goaf water and its prevention technique were studied. The results show that the features of goaf water in Huainan coal basin includes distributive-unbalanced, static state deposited principally, low position of the working place coal layer bottom bed and mostly at the inner collapsed zone. The forecasting model of value set for goaf water filled was presented according the field tested data in Huainan coal basin with the nonlinear theory analysis. The rationality of this model was validated by the application cases studies. Forming goaf water is a process of dynamic diversification under the coupling action among seepage, stress and surrounding rock. This is a multi-factors influenced goaf water formed mechanism. It is prominent influence factor that width of waterproof coal pillar for displacement of stratum. Under the condition of supplied with water the pressure of pore water decrease gradually along with increase of width of waterproof coal pillar. It is varies little that the influence of coal pillar node displacement on account of pore water pressure transformation remarkably. The consistent disciplinarian was represented for logical width of waterproof coal pillar under three case schemes in this numerical simulation. The width of pillar with 8 m can be regarded as the most ideality size for Panyi Coal Mine.