Analysis Of Mechanism And Study Of Numerical Simulation On Coalmine Floor Water Inrush

The disaster of water in coalmine has long been bringing huge economic loss and personnel casualty to our country and people. The water inrush is a serious disaster which faces frequently in the mining process. Along with the change of the way, the depth and the working face criterion in coal mining, the disaster of water is more and more serious. Developing the study of mechanism on mine water inrush, containing the occurrence of water inrush accidents effectively, and ensuring coalmine safety in production, is the current question which the coalmine industry needs to solve.At first, This paper analyzed to summarize the classification methods and common mechanism of the coal mine floor water inrush questions, then used the RFPA^2D -Flow numerical calculus system, emphasized in the rock mesomechanics' way, considered fully with the heterogeneity of rock and the flow-damage coupling function in the failure process, combined with the engineering hydrology geological data on the site of the Kailuan Fan Gezhuang coalmine, researched the question about No. 12 coalmine floor water inrush by numerical simulation. The numerical simulation divided into the complete floor water inrush and floor water inrush including the fault influence, researched the entire process of rock mass from damage to destroy under hydraulic pressure actuation, and analyzed the mechanism of coalmine floor water inrush from different ways, such as distortion, stress, hydraulic pressure, flow and so on. In the numerical simulation of complete floor water inrush this paper considered the influence to floor water inrush about aquifer with different hydraulic pressure, obtained the critical water inrush coefficient which is close with the actual value; While in the numerical simulation of the floor water inrush including the fault influence, used the finite element strength reduction method, obtained the floor critical buckling strength and safety coefficient in the different inclination angles condition, discussed the relations of fault inclination angle with floor water inrush.The numerical simulation reappeared the dynamic evolutionary process of the rock mass damage to destroy until the water inrush in the condition of mining, showed out the entire process of the fracture sprout, expansion even run-through to a water channel, obtained the results in accordance with actual case, provided some foundational bases for research for the coalmine water inrush mechanism.