深部含瓦斯煤吸附气体运移及失稳破坏的理论与实验研究

发布时间：2018-05-03 19:24

本文选题：煤 + 吸附气体　；参考：《中国矿业大学（北京）》2014年博士论文

【摘要】：针对深部含瓦斯煤的失稳破坏以及其中吸附气体对工程实际造成巨大损失的现状，开展了吸附气体运移的实验和数值研究以及深部含瓦斯煤岩的稳定性理论研究。利用实验室自行研制的深部煤岩温度压力耦合试验系统，对不同矿区的煤样进行了温度压力耦合作用下吸附气体解吸扩散运移实验。在实验室重现了了不同煤层温度下原煤的破裂过程中吸附瓦斯的解吸扩散过程，初步揭示了吸附气体在升温、恒温、单轴破裂下以及围压作用下的解吸扩散特征；从煤岩的孔隙结构以及孔隙率出发，建立了煤岩多孔介质的等效几何模型，利用LS-Dyna模拟了煤岩多孔介质中的扩散行为；从煤样单轴破坏的过程提出了其失稳破坏的非线性尖点突变模型，然后从静力学的尖点突变方程出发，建立了煤柱在周期外力下的非线性微分方程，研究了煤柱系统的混沌动力学演化行为。
[Abstract]:In view of the instability failure of deep gas-bearing coal and the large losses caused by the adsorbed gas, the experimental and numerical study on the migration of adsorbed gas and the theoretical study on the stability of deep gas-bearing coal and rock are carried out. The experiments of desorption and diffusion migration of adsorbed gas in coal samples from different mining areas were carried out by using the temperature and pressure coupling test system developed by the laboratory. The desorption and diffusion process of adsorbed gas in the process of coal fracture at different coal seam temperatures was reproduced in the laboratory, and the characteristics of desorption and diffusion of adsorbed gas under temperature rise, constant temperature, uniaxial rupture and confining pressure were preliminarily revealed. Based on the pore structure and porosity of coal and rock, the equivalent geometric model of porous medium of coal and rock is established, and the diffusion behavior in porous medium of coal and rock is simulated by LS-Dyna. According to the process of uniaxial failure of coal sample, the nonlinear cusp catastrophe model of instability failure of coal sample is proposed, and then the nonlinear differential equation of coal pillar under periodic external force is established based on the cusp catastrophe equation of statics. The chaotic dynamic evolution of coal pillar system is studied.
【学位授予单位】：中国矿业大学（北京）
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TD712

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