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含瓦斯煤体损伤破坏特征及瓦斯运移规律研究
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摘要
通过实验研究、理论分析、数值模拟并结合现场实践的方法,进行了含瓦斯煤体损伤破坏特征及瓦斯运移规律研究。首先利用压汞和扫描电镜等手段研究不同煤阶煤样孔隙结构特征,并结合等温吸附试验分析了瓦斯气体在不同煤阶储层中的赋存状态,确定了瓦斯含量计算方法;然后在气固耦合作用下完成了两种含瓦斯煤的力学特性、吸附膨胀及全应力应变过程的渗流演化实验,建立了简单煤基质裂隙系统模型,确定煤基质在平衡、低压以及超压等三种状态时变形特征,并推导出孔隙率和渗透率公式;在全应力应变原煤煤样失稳破坏过程,完成渗流及声发射参数同步监测,阐述了含瓦斯煤岩体声发射发生机理并推导了含瓦斯煤介质损伤方程,基于煤岩破裂过程中声发射特性及时空演化机制掌握了含瓦斯煤岩损伤变形规律,构建了含瓦斯煤统计损伤本构模型;建立了气-固-损伤耦合模型并植入多物理场耦合分析软件中,研究埋深和瓦斯压力对深部煤层的瓦斯运移影响规律。
Through experimental research, theoretical analysis, numerical simulation and field practice,conduct the deep gas of coal seam open coal rock damage fracture characteristics and the gasmigration law research. Firstly using mercury injection, scanning electron microscopy andtransmission electron microscopy to study deep gas coal seam coal with different coal ranksample’s pore and fissure structure characteristics, combined with the isothermal adsorption test toanalyze reservoirs’ occurrence state of gas within coalbed with different coal rank; then conductmechanical damage characteristics, adsorption and seepage and evolution of the whole process ofstress and strain test of the two kinds of containing gas coal in gas-solid coupling, simple coalmatrix fracture system model is established, determine coal matrix’s deformation characteristics inthe three states of balance, low pressure and overpressure; accomplish seepage and acousticemission parameters of synchronous monitoring of crude instability and failure in all the stress andstrain process, explain the mechanism of acoustic emission of coal containing gas and deduce coalcontaining gas medium damage equation based on acoustic emission, obtain damage deformationregularity of coal containing gas based on the acoustic emission characteristics and time-spaceevolution mechanism; gas-solid coupling model is established and inserted in multi-physicscoupling analysis software, the mechanism of deep ground coal gas migration influenced byground stress and gas pressure are studied; Finally, through investigation three-dimensionaldrainage system of the deep coal mine rich in gas, evaluate the gas control technology of deepwell low gas permeability coal seam based on this system.
引文
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