基于渗流失稳理论的煤体层裂机制分析
Analysis of Coal Seam Spalling Fracture Mechanism Based on Theory of Seepage and Loss Stabilit
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摘要: 基于对流-固耦合数学模型的数值解算,根据计算结果,从渗流破煤的角度解释了煤体卸压后层裂发生的力学机制;通过对计算结果数据的整理分析,得到了煤体在渗流作用下发生初次破坏的力学定量条件,并定性的描述了层裂破坏持续推进以及终止的力学条件。数值计算结果显示:煤体的抗拉强度、初始吸附压力以及卸压速率共同决定着初次破坏能否发生以及破坏层裂体的厚度;层裂破坏能否持续推进主要由未被破坏煤体的卸压状况以及层裂空间内的压力变化趋势所决定,前者可以通过数值计算定量获得,而后者则与层裂破坏后层裂体的厚度以及破碎程度有关。Abstract: Based on the numerical solution of flow-solid coupling mathematical model, the mechanical mechanism of strata cracking after coal unloading is explained from the perspective of seepage breaking coal. Through the collation and analysis of the calculated data, the mechanical quantitative conditions for the initial failure of the coal body under the action of seepage were obtained, and the mechanical conditions for the continuous advance and termination of the fracture failure were qualitatively described. The results of numerical calculation show that the tensile strength, initial adsorption pressure and unloading rate of the coal body determine whether the initial failure can occur and the thickness of the fractured body. Whether the spalling failure can continue to advance is mainly determined by the pressure relief condition of undamaged coal body and the pressure change trend in the spalling space. The former can be obtained quantitatively through numerical calculation, while the latter is related to the thickness and crushing degree of the crack body after the spalling failure.
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