基于煤层包体构造模型的煤与瓦斯突出灾害动力学特征数值模拟
首发时间:2010-01-04
摘要:考虑煤岩介质材料力学性质的非均匀性特点和煤岩介质变形破裂过程中透气性的非线性变化特性特征,建立了基于煤层包体构造模型,应用含瓦斯煤岩破裂过程固-气耦合动力学模型开发的RFPA2D-Flow软件系统,模拟了掘进巷道穿过含瓦斯煤体的包体构造带,由于巷道开挖诱发的煤与瓦斯突出动力灾害发生的过程,研究了煤巷开挖过程中围岩的应力演变、裂隙发展、透气性系数变化特征,分析了包体构造不同地应力、瓦斯压力、煤体性质条件下的煤与瓦斯突出灾害发生的细观动力演变过程。其研究内容对进一步认识煤与瓦斯突出机理,煤与瓦斯突出的实验室模拟实验具有理论指导和实践借鉴意义。
关键词: 深水平 含瓦斯煤岩 突出 数值模拟 RFPA2D-Flow
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Numerical simulation of the coal and gas outburst dynamical characteristics based on coal seam tectonic mass structure model
Abstract:Considering the heterogeneity characteristics of the mechanical properties of coal and rock and the nonlinear evolution characteristics of gas permeability in stressed coal and rock, it founds a mechanical model based on coal seam tectonic mass structure. It simulates the process of coal and gas outburst dynamical disaster induced by laneway excavation in tectonic zone in coal seam with gas with the aid of RFPA2D-Flow software developed on the basis of the solid-gas coupling dynamic model. The stress evolution of the surrounding rock, the development of the fractures in coal and rock and the evolvement of the permeability during the laneway excavation are studied. It analyzes the microscopic dynamical evolvement of the coal and gas outburst disaster under different conditions of tectonic mass such as stress, gas pressure and coal property. The numerical simulation is of great significance for theoretic guidance and practical reference to understanding the coal and gas outburst mechanism thoroughly and the laboratorial coal and gas outburst experiment.
Keywords: deep level gaseous coal and rock outburst numerical simulation RFPA2D-Flow
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基于煤层包体构造模型的煤与瓦斯突出灾害动力学特征数值模拟
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