【摘 要】
：
为进一步研究含瓦斯煤体爆破作用机理,利用断裂损伤力学理论分析了爆破裂纹尖端的复合应力状态,利用DYNA软件建立了煤体耦合装药结构模型和含瓦斯压力模型进行计算,结果表明:
【机 构】
：
河南理工大学土木工程学院,洛阳理工学院建筑工程系,
论文部分内容阅读
为进一步研究含瓦斯煤体爆破作用机理,利用断裂损伤力学理论分析了爆破裂纹尖端的复合应力状态,利用DYNA软件建立了煤体耦合装药结构模型和含瓦斯压力模型进行计算,结果表明:煤体中爆炸应力波按指数规律衰减,衰减系数α=(3-μ)/(1-μ);瓦斯压力的存在增大裂隙尖端的应力和应力强度因子K1,延长应力波作用时间,有利于爆破裂纹的形成与扩展.数值计算结果与模拟煤体爆破试验结果具有较好的一致性.
In order to further study the mechanism of blasting coal-bearing gas explosion, the composite stress state of blasting crack tip is analyzed based on the theory of fracture damage mechanics. The coal-body coupled charge structure model and gas pressure model are established by DYNA software. The results show that coal The explosion stress wave in the body decays exponentially with the attenuation coefficient α = (3-μ) / (1-μ); the presence of gas pressure increases the stress and stress intensity factor K1 at the tip of the fracture, lengthening the stress wave action time, The formation and propagation of blasting cracks.The numerical results are in good agreement with the results of simulated blasting tests.
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