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

作　　者：沈逸飞 许慎 冯培云 庞凤玲 SHEN Yifei;XU Shen;FENG Peiyun;PANG Fengling(College of Mining Engineering,North China University of Science and Technology,Tangshan 063210,China;Mining Development and Safety Technology Key Laboratory of Hebei Province,Tangshan 063210,China;Qianjiaying Mining Branch of Kailuan Group Co.,Ltd.,Tangshan 063009,China)

机构地区：[1]华北理工大学矿业工程学院,河北唐山063210 [2]河北省矿业开发与安全技术重点实验室,河北唐山063210 [3]开滦集团责任有限公司钱家营矿业分公司,河北唐山063009

出　　处：《煤矿安全》2022年第2期59-65,共7页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(5187041215);河北省省属高等学校基本科研业务费资助项目(JQN2020040);河北省博士研究生创新资助项目(CXZZBS2019132)。

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%。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.

关 键 词：水射流破煤 数值模拟 围压 损伤机理 裂隙范围 

分 类 号：TD713.3[矿业工程—矿井通风与安全]