负压抽采条件下孔隙率对动态加载构造煤渗透率影响的实验研究
Experiment on Effect of Porosity and Dynamic Loading on Permeability of Tectonic Coal Under Negative Pressure Drainage
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摘要: 为了研究孔隙率对在负压抽采、轴压动态加卸载条件下构造煤原煤试件瓦斯渗透率影响，自主研发了一种负压可控的气固耦合三轴伺服渗流实验装置。实验结果表明：孔隙率对原煤体瓦斯渗透率影响较为显著，瓦斯渗透率随着孔隙率的增加而增大；在围压、抽采负压及进气口瓦斯压力保持恒定条件下，瓦斯渗透率随着加载轴压的增大而小幅增加，达到峰值后则随着轴压的增大而迅速减小，轴压卸载过程中瓦斯渗透率缓慢增大，然而难以恢复到初始渗透率；保持相同围压、轴压及进气瓦斯压力条件下，渗透率随着抽采负压的增大而增大，然而这种效果在高应力作用下影响甚微。Abstract: In order to study the effect of porosity and dynamic loading on gas permeability of tectonic raw coal specimen under negative pressure drainage, a gas-solid coupling triaxial stress servo seepage experimental device was developed. Experimental results show that the porosity has more significant influence on gas permeability of raw coal; the gas permeability increases with the increasing of porosity; under the constant condition of confining pressure, drainage negative pressure and gas inlet gas pressure, the permeability increases slightly with the increasing of the axial compression; after reaching the peak point, it decreases rapidly with the increasing of axial pressure; the gas permeability increased slowly during the axial pressure unloading process, however, it is difficult to restore to the initial permeability; under the condition of maintaining the same confining pressure, axial pressure and gas pressure, permeability increases with the increasing of negative pressure, this effect has little influence under high stress.
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Keywords:
- negative pressure drainage /
- porosity /
- dynamic loading /
- permeability /
- tectonic coal
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