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为探究瓦斯压力、围岩应力变化引起煤体变形规律,利用自行研制的应力-渗流-解吸煤体变形试验装置,以铁新煤矿9号煤为研究对象,开展应力、渗流作用下煤体变形试验,根据试验结果分析围压和孔隙压力对煤体变形影响的显著程度。结果表明:围压自15 MPa起,在以2 MPa/次梯度递减至5 MPa的过程中,煤体的径向应变呈线性减小,纵向应变呈线性增加趋势;围压为定值时,煤体变形与孔隙压力的关系满足二次函数;煤体径向变形和孔隙压力、围压的关系满足二元二次函数,且围压对煤体变形的影响比孔隙压力更显著。
In order to explore the gas pressure, the deformation of the surrounding rock caused the deformation law of the coal body. Using the self-developed stress-seepage-desorption coal deformation test device, taking the No.9 coal of the Tiexin Coal Mine as the research object, the deformation of the coal body under stress and seepage was carried out. Test, according to the test results analysis confining pressure and pore pressure on the degree of significant impact on the deformation of coal. The results show that the radial strain decreases linearly and the longitudinal strain increases linearly with the confining pressure decreasing from 15 MPa to 2 MPa / subgradient to 5 MPa. When the confining pressure is constant, The relationship between coal deformation and pore pressure satisfies the quadratic function. The relationship between radial deformation, pore pressure and confining pressure satisfies bivariate quadratic function, and the effect of confining pressure on deformation of coal is more significant than pore pressure.