煤岩渗流特征及应力敏感性实验研究
Experimental study on coal seepage characteristics and stress sensitivity
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摘要: 以山西潞安矿区大平煤矿3号煤层为研究对象，利用HB-2型煤岩样孔渗吸附测量装置，系统探讨了煤渗透率对孔隙压力以及围压的响应规律，定量分析了受载煤样渗透率与孔隙压力及围压之间的关系。结果表明：在低气压条件下煤样渗透率随孔隙压力的增加符合幂函数降低趋势，孔隙压力在临界值1.5 MPa以下时，煤样渗透率更敏感；孔隙压力恒定条件下，煤样渗透率随围压的升高呈幂函数降低趋势，渗透率降幅明显，多高于85%；煤储层应力的变化会对煤渗透率产生50%以上的不可逆损伤，煤体加卸载过程中的渗透率衰减率随着围压升高整体趋势是向下的衰减规律，其局部变化为不仅1个极值的波动特征。Abstract: Taking No.3 coal seam of Daping Coal Mine in Lu’an Mining Area of Shanxi Province as the research object, the response law of coal permeability to pore pressure and surrounding pressure was systematically explored by using HB-2 type coal rock sample pore permeation adsorption measurement device, and the relationship between the permeability of loaded coal samples and pore pressure and surrounding pressure was quantitatively analyzed. The results show that: the permeability of coal samples under low pore pressure conditions decreases with the increase of pore pressure in accordance with the power function, and the permeability of coal samples is more sensitive when the pore pressure is below the critical value of 1.5 MPa; the permeability of coal samples under constant pore pressure conditions decreases with the increase of surrounding pressure in a power function, and the permeability decreases significantly, more than 85%; the change of stress in coal reservoir will produce more than 50% irreversible damage to coal permeability. The overall trend of the permeability decay rate during unloading of the coal body with the increase of the surrounding pressure is a downward decay law, and its local variation is characterized by fluctuations of more than one extreme value.
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