瓦斯压力对煤体吸附-解吸变形特征影响试验研究

Experimental Study on Influence of Gas Pressure on Coal Adsorption/Desorption Deformation Characteristics

以松藻煤电公司渝阳煤矿8#突出煤层原煤试样为研究对象,开展了不同瓦斯压力条件下的煤体吸附-解吸变形试验。研究结果表明:含瓦斯煤体吸附-解吸变形动态曲线可划分为抽真空压缩变形阶段I、吸附膨胀变形阶段II、解吸收缩变形阶段III等3个阶段;煤体的吸附-解吸变形具有明显的各向异性特征,但横纵向变形量比值随时间和压力变化不明显,趋于定值;含瓦斯煤体体积变形随吸附/解吸压力的增大呈线性增加,吸附/解吸时间越长,线性斜率越大;含瓦斯煤体吸附-解吸变形不可逆,残余变形量随气体压力增加而增大,且纵向变形对煤体残余体积变形贡献相对较大。

Based on 8~#coal seam of coal core samples of Yuyang Coal Mine of Songzao Coal and Power Company,the experiments of coal adsorption-desorption deformation were carried out under different gas pressures.The test result indicated that:the adsorption-desorption deformation dynamic curve of coal containing gas could be divided into vacuum compression deformation stage I,adsorption swelling deformation stage II,and desorbed shrinkage deformation stage III;the adsorption-desorption deformation of coal had obvious anisotropic characteristics.The ratios of horizontal and vertical deformation did not change significantly with time and pressure,and it tended to be constant;the volumetric deformation of coal containing gas increased linearly with the increase of adsorption/desorption pressure.At the same time,the longer the adsorption/desorption time,the greater the linear slope;the adsorption-desorption deformation was irreversible.The residual deformation increases with the gas pressure,and the vertical deformation provided more contribution to residual volume deformation.