【摘要】 在煤与瓦斯突出中,煤体自组织地形成最具抗力的球盖壳形式来抵抗被突出,煤壳一旦解体便丧失承载能力,高位势煤岩系统中与单个煤壳突出相应的各种能量得以释放。根据反映煤岩破坏特性的塑性变形局部化理论,导得突出前煤壳形变、位移时相应于偏应力的功、能增量关系,建立了煤壳失稳解体的突变模型,并对由于偏应力作用导致煤壳失稳解体机制进行了研究,给出失稳瞬间释放的偏应力应变能表达式、煤岩系统体积应变能释放量表达式和孔隙瓦斯粉碎解体后的碎煤及与煤层瓦斯渗流形成瓦斯-煤粉两相流描述。所得结果可深化对煤、地应力与瓦斯压力三因素对煤与突出演化规律综合作用的认识。更多还原

【Abstract】 In process of coal-gas outburst, the coal mass forms a spherical shell itself which is the best form to resist outburst. Once the coal shell disintegrates, it loses carrying capacity; and in the high-potential coal-rock system, all kinds of energy corresponding to the outburst of a single coal shell are released immediately. According to the theory of plastic deformation localization which reflects the destruction characteristics of coal-rock, the equilibrium relationship of work and energy increments corresponding to deviatoric stress while coal shell deforms is educed; and the catastrophe model of destabilization and disintegration of coal shell is established. The mechanism of coal shell disintegration due to deviatoric stress is studied; the expressions of deviatoric strain energy at the destabilization moment, volumetric strain energy releasing amount are educed. The description of crushed coal and gas seepage form two-phase flow of gas-coal after porous gas outburst is given. The obtained analysis result can deepen the acquaintance with the combined action of three factors (coal, geostress and gas pressure) on coal-gas outburst.更多还原