煤体破坏程度对瓦斯吸附解吸的影响规律研究

发布时间：2018-03-24 00:21

本文选题：原煤　切入点：破坏程度　出处：《安徽理工大学》2017年硕士论文

【摘要】：本论文对煤样试件在单轴压缩破坏下不同破坏阶段的瓦斯吸附解吸规律进行了实验研究,并结合数值模拟结果说明破坏过程孔隙-裂隙结构的发展。实验结果表明:1)煤样在完整状态的瓦斯吸附量最大,弹性点阶段、屈服点阶段、峰值点阶段、破碎阶段的瓦斯吸附量相差不大,但明显低于完整状态时的瓦斯吸附量;2)从煤样完整状态至破碎阶段,煤样的解吸初速的变化趋势呈"U"字形,完整状态、峰值点阶段、破碎阶段的瓦斯解吸初速度较大,弹性点阶段、屈服点阶段的解吸初速度较小;3)随着瓦斯压力的增大,煤的瓦斯吸附量增大,但瓦斯吸附量增量变化率逐渐减小;4)随着瓦斯压力的增大,煤样达到吸附平衡所需时间随之延长;5)煤样破坏过程中的声发射特征与应力-应变曲线特征相吻合,可以表征煤样破坏过程煤体内部孔隙-裂隙结构的变化发育情况。
[Abstract]:In this paper, the law of gas adsorption and desorption of coal samples at different failure stages under uniaxial compression failure is studied experimentally. Combined with the numerical simulation results, the development of pore-fracture structure in the failure process is illustrated. The experimental results show that the gas adsorption capacity of the coal sample in the complete state is the largest, the elastic point stage, the yield point stage, the peak point stage, The amount of gas adsorbed in crushing stage is not different, but it is obviously lower than that in complete state.) from the complete state of coal sample to the stage of crushing, the change trend of initial velocity of desorption of coal sample is "U" shape, complete state and peak value stage. The initial velocity of gas desorption in breakage stage is larger than that in elastic point stage and yield point stage. (3) with the increase of gas pressure, the gas adsorption capacity of coal increases. With the increase of gas pressure, the time required for coal samples to reach adsorption equilibrium is prolonged. The acoustic emission characteristics of coal samples in the process of destruction are consistent with the stress-strain curves. It can be used to characterize the change and development of pore-fracture structure in coal body during coal sample failure.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD712

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