Comparative analysis of material configuration and gas permeability of pouring coal-like materials
Yang Wenwang， Zhang Zhen， Ma Yankun
Coal Mine Safe and Efficient Mining Key Laboratory Jointly Established by the Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China
In order to analyze the change of permeability characteristics of similar materials of raw coal and poured coal under different pressure conditions, the permeability test of the change of gas permeability of raw coal and poured coal along with the pore pressure. The results show that: (1) the permeability of raw coal and coal materials can be divided into two stages with the change of pressure difference, that is, when the pressure difference is 0.04 MPa-0.54 MPa, the permeability decreases rapidly with the increase of pressure difference, the permeability of raw coal decreases by 75.19 %, the permeability of coal materials decreases by 87.83 %-92.26 %; when the pressure difference is 0.54 MPa-0.84 MPa, the permeability decreases slowly with the permeability of raw coal decreases by 17.09 %, and the permeability of coal materials decreases by 28.28 % -43.35 %; (2) Under identical pressure differential conditions, the permeability of coal-like materials consistently surpasses that of raw coal, As the pressure difference gradually increases, The permeability difference between briquette and raw coal shows a trend of gradual decrease, And the decay of 0.54 MPa-0.84 MPa permeability is less than the decay of 0.04 MPa-0.54 MPa permeability; (3) The pore pressure sensitivity coefficient and permeability variation rate of both raw coal and coal-like materials exhibit a biphasic behavior as pore pressure varies, the first stage is when the pore pressure is 0.13 MPa-0.33 MPa, The pore pressure sensitivity coefficient decreases rapidly with increasing pore pressure, The permeability change rate rises rapidly with increasing pore pressure, The pore pressure sensitivity coefficient of raw coal and briquette decreased by 44.94 % and 69.08 % -75.18 %, respectively, The change rate of permeability increased by 63.66 % and 19.4 % -35.3 %, respectively; The second stage is at the pore pressure of 0.33 MPa-0.48 MPa, The pore pressure sensitivity coefficient is slowly decreased with increasing pore pressure, The rate of permeability change rises slowly with increasing pore pressure, The pore pressure sensitivity coefficient of raw coal decreased by 33.97% and 24.36 % -35.97 %, respectively, The rate of change of permeability increased by 5.33 % and 2.45% -4.92 %, respectively.
杨文旺，张 珍，马衍坤. 浇筑型类煤材料配置与气体渗透性能对比分析[J]. 煤炭与化工, 2025, 48(3): 99-105.
Yang Wenwang， Zhang Zhen， Ma Yankun. Comparative analysis of material configuration and gas permeability of pouring coal-like materials. CCI, 2025, 48(3): 99-105.
