为了分析原煤与浇筑型类煤相似材料在不同压力条件下的渗透特性变化，采用核磁共振在线渗吸系统，分别对2种煤样进行渗透率测试试验，分析原煤与浇筑型类煤相似材料的气体渗透率随孔隙压力变化的规律。结果表明，①原煤与类煤材料的渗透率随着压力差的改变可以分为2个阶段，即在压力差为0.04～0.54 MPa时，渗透率随着压力差的增加而快速下降，原煤的渗透率下降75.19%，类煤材料的渗透率下降87.83%～92.26%；在压力差为0.54～0.84 MPa时，渗透率随着压力差的增加而缓慢下降，原煤的渗透率下降了17.09%，类煤材料的渗透率下降28.28%～43.35%；②在相同压力差条件下，类煤材料的渗透率始终高于原煤，随着压力差的逐渐增大，类煤材料与原煤之间的渗透率差值呈现出一种逐渐减小的趋势，在压力差为0.54～0.84 MPa渗透率的衰减量小于0.04～0.54 MPa渗透率的衰减量；③原煤和类煤材料的孔压敏感性系数和渗透率变化率随孔隙压力的变化分为2个阶段，第一阶段是在孔隙压力为0.13～0.33 MPa时，孔压敏感性系数随孔隙压力的增加而快速下降，渗透率变化率随着孔隙压力的增加而快速上升，原煤和类煤材料的孔压敏感性系数分别下降44.94%和69.08%～75.18%，渗透率变化率分别上升63.66%和19.4%～35.3%；第二阶段是在孔隙压力为0.33～0.48 MPa时，孔压敏感性系数随孔隙压力的增加而缓慢下降，渗透率变化率随着孔隙压力的增加而缓慢上升，原煤的孔压敏感性系数分别下降33.97%和24.36%～35.97%，渗透率变化率分别上升5.33%和2.45%～4.92%。

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.