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为提高瓦斯抽采率和揭示保护层采动覆岩裂隙演化规律以及定量分析保护层卸压增透范围,将覆岩裂隙定义为具有开裂损伤功能的粘结单元,利用ABAQUS开发了粘结单元本构关系,建立了采动覆岩砌体结构内聚力模型,进行了粘结单元表征下的保护层采动裂隙演化数值模拟,通过粘结单元损伤程度分析采动裂隙发育状态,根据裂纹的连通状态界定采场覆岩损伤破坏区域,并得到了采动卸压范围及渗透率分布规律,采动裂隙演化规律模拟结果与实验一致,验证了覆岩砌体结构内聚力模型的精准性.
In order to increase the gas drainage rate and reveal the evolution law of the overlying strata fissures evacuated by the protective layer and quantitatively analyze the range of pressure relief and permeability enhancement of the protective layer, the overlying strata fissure is defined as the bonding unit with the function of cracking damage. Using ABAQUS, Constitutive relationship, the cohesive force model of mining overburden rock masonry structure was established. The numerical simulation of the evolution of the mining caving fissures under the bond cell characterization was carried out. The fracture development state was analyzed by the damage degree of the bond cell. According to the connectivity of the crack State of overburden rock is defined and the distribution range of pressure relief and permeability is obtained. The simulation results of evolution law of the mining fissure are consistent with the experiment, and the accuracy of cohesion model of overburden masonry structure is verified.