Experimental study on anisotropic characteristics of coal deformation caused by gas adsorption and desorption
WEI Bin1, ZHAO Yu2, ZHANG Yugui1
1. College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China; 2. School of Civil Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China
Abstract：In the process of underground gas extraction and development of coalbed methane,the gas adsorption and desorption will cause coal matrix swelling and shrinkage.In order to better analyze the anisotropic characteristics of coal deformation caused by gas adsorption and desorption,we test meager lean coal samples from two-1 coal seam of Hebi No.6 Coal Mine under different gas pressure with a self-developed coal deformation test system.The following phenomena are observed:A.Coal samples show anisotropic characteristics in the process of coal matrix swelling and shrinkage due to gas adsorption and desorption,the deformation in the vertical bedding direction is the largest,the direction in parallel bedding vertical face cleat is the second,and the direction in parallel bedding vertical butt cleat is the smallest; B.The deformation of coal matrix swelling and shrinkage increases with the increase of gas pressure,but the deformation ratio between parallel bedding vertical face cleat direction and vertical butt cleat direction decreases gradually,and their anisotropy diminish gradually; C.The deformation of coal matrix after swelling and shrinkage is an irreversible process,and the residual deformation of coal increases with the increase of gas pressure,and it has a linear correlation with the gas pressure.
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