通过建立双孔隙度煤层变形控制方程,确定了基于煤层吸附理论的Biot孔隙压力系数。分别建立了存在吸附作用的条件下,煤层基质和裂隙渗透率的数值模型。研究发现,通过增加基质孔隙压力,基质将发生与孔隙压力相关的体积应变,基质体积模量将会减小;基质增大的体积占据了部分孔隙,导致煤层基质渗透率减小;随着吸附的进行,经过一定时间,煤层裂隙渗透率会出现陡降。 By establishing the governing equations of dual porosity coal seam deformation, the Biot pore pressure coefficient based on the coal bed adsorption theory was determined. The numerical models for the permeability and permeability of the coal seam under the condition of adsorption are established respectively. The study found that by increasing the matrix pore pressure, the matrix will undergo volumetric strain associated with pore pressure, and the matrix bulk modulus will decrease. The increased volume of the matrix occupies part of the pores, resulting in the decrease of the matrix permeability. With the adsorption Of the progress, after a certain period of time, coal seam fracture permeability will drop sharply.