The Model And Numerical Simulation Of Gas Flow In Fractured Field Under Mining Effect

In recent years, China's coal mining technology and equipment have greatly improved, mining intensity increased, coal production become higher and higher, and coal seam gas flow-volume also increase greatly. Rapid industrial development, but also give coal power disasters left hidden trouble, colliery safety production will lead to higher levels of challenges. Therefore, Chinese scholars have keen on research gas flow in fractured field under mining effect.In order to improve the gas extraction efficiency and prevent the occurrence of mine gas dynamic disasters, this article researches the gas flow in fractured field under mining effect. Articles based on the research of gas flow in fractured field at home and abroad, take coal and rock under mining effect as the object of study. With the method of the theoretical analysis and numerical simulation combining, using the rock mechanics and percolation mechanics, fracture mechanics, damage mechanics, mining learning and finite element analysis interdisciplinary theory, using finite element software of stope FEPG simulates coal rock fracture field evolution regularity and fissure field gas seepage rule analysis, the concrete content as follows:(1) To study the mining coal rock fracture field distribution rules of coal and rock, endogenous fracture and exogenetic fractures are analyzed.(2) In order to simulate stope coal rock fracture distribution and its evolution rule, after the coal rock fracture evolution similar material simulation experiment in lab to verify the correctness of the theory.(3) On the basis of the coal specimens of stress and strain process permeability experiment , developed permeability and stress and strain state theory model.(4) With damage theory to describe crack propagation on stope, to establishment the flow - damage coupled equations and fluid-structure interaction equation.(5) Simulation mining-induced fractures field gas seepage rule, finite element software , realize the mining-induced fractures field gas seepage rule simulation, get stress, displacement, gas pore pressure such variables as regularity of distribution.