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以耦合致裂效果定量化评估为目标,采用数值模拟的方法构建等效于煤体耦合致裂后强度的离散元模型。提出以模型整体强度为指标实现煤体整体–散体的等效离散化转化,利用离散元模型研究顶煤的垮放、流动规律,分析耦合致裂后离散态颗粒间的铰接关系及其对垮放程度的影响,量化装药量、注水压力和煤体垮放能力之间的映射关系,通过工程实践进行验证。结果表明:耦合致裂的本质是爆炸形成的爆生气体和冲击波共同在已软化的煤岩体中传播,以煤体整体的强度为等效转化指标实现研究对象在不同算法间的等效转化。耦合致裂通过降低块体间拉应力和颗粒间接触的数量提高煤体的冒放性,得出煤体充分垮放指标和满足厚煤层采区回采率要求的强度最高值,完成复杂环境下煤体耦合致裂效果的定量化评估。
Taking the quantitative evaluation of the coupling cracking effect as the goal, a discrete element model equivalent to the post-coupling strength of the coal body is constructed by numerical simulation. Proposed to use the overall strength of the model as an indicator to achieve the equivalent discrete transformation of coal bulk - bulk, the discrete element model to study the collapse of the top coal, the flow law, analysis of coupling between the fractured particles of the articulation and its relationship The degree of collapse, the relationship between the quantitative charge, water injection pressure and the capacity of coal body collapse, verified through engineering practice. The results show that the essence of coupling fracture is that the explosive gas and shock wave propagated in the explosion propagate together in the softened coal and rock mass, and the equivalent conversion of the object under different algorithms is achieved by taking the overall strength of coal as the equivalent conversion index . Coupling fissures improve the coal body’s runoff by reducing the amount of tensile stress between the blocks and the number of particles in contact with each other to obtain the maximum collapse intensity index of coal and the strength required to meet the recovery rate requirement of the mining area in thick coal seam. Quantitative Evaluation of the Cracking Effect of Coal Body Coupling.