围压作用下水射流破岩损伤机理的数值模拟研究
Numerical simulation of rock damage mechanism by water jet under confining pressure
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摘要: 采用显示动力学软件对水射流冲孔过程进行数值模拟，探究煤岩在高压水射流冲击下的破碎规律及裂隙发育状态，分析射流水柱冲击有／无围压的煤岩时，掏槽成孔的过程及机理，论证了煤岩体受拉伸力和剪切力的作用下导致横纵向裂隙形成并逐渐延伸成裂隙网的过程。研究结果表明：水射流冲击煤岩形成孔洞的同时，会在周围煤岩形成供瓦斯运移的裂隙，且成孔损伤范围受围压的影响；射流参数一定时，围压作用会阻碍孔深和孔径的扩展，但会使得周围裂隙的发育范围进一步扩张，20 ＭＰａ围压作用下扩张范围约增加40％。Abstract: The display dynamics software is used to numerically simulate the punching process and explore the fracture of coal and rock under the impact of high-pressure water jets. We analyze the process and mechanism of cutting holes when the jet water column impacts coal and rock with or without confining pressure, and demonstrate the process that the coal and rock mass is subjected to tensile and shear forces to cause horizontal and vertical cracks to form and gradually extend into a crack network. The research results show that when the water jet impacts the coal and rock to form pores, it will form fissures for gas migration in the surrounding coal and rock, and the pore-forming damage range is affected by the confining pressure. When the jet parameters are constant, the confining pressure will hinder the expansion of the hole depth and pore size, but will further expand the development range of the surrounding fissures, and the expansion range will increase by about 40% under the action of the 20 MPa confining pressure.
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