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基于流体动力学与弹性力学基本理论,分析水射流冲击岩石过程中产生的水锤压力与滞止压力,推导不同压力阶段水射流截面上动压力径向分布函数,建立水射流以不同的夹角α冲击横观各向同性岩石的数学模型,选取α=0°,45°,90°研究冲击夹角对岩石破碎规律的影响;选择具有良好横观各向同性的砂岩开展不同夹角的冲击实验。理论分析与实验研究表明:水锤压力导致横观各向同性岩石产生冲击破碎坑,滞止压力诱发岩石内部裂纹的产生与扩展;水射流以垂直于、倾斜于、平行于层理冲击横观各向同性岩石导致其分别产生横向裂纹、倾斜裂纹和劈裂裂纹。
Based on the basic theory of fluid dynamics and elastic mechanics, the water hammer pressure and stagnation pressure produced by water jet impacting on rock are analyzed, and the radial pressure distribution function of dynamic pressure at different pressure phases is deduced. α impact transverse isotropic rock mathematical model, choose α = 0 °, 45 °, 90 ° to study the influence of impact angle on the rock fragmentation law; choose sandstone with good transverse isotropy to carry out the impact of different angles experiment. Theoretical analysis and experimental studies show that water hammer pressure causes the impact and breakage of transversely isotropic rock, and the stagnation pressure induces the generation and propagation of internal cracks in the rock. The water jet is perpendicular to, oblique to, transverse to the impact of bedding impact Isotropic rocks cause them to produce transverse cracks, sloping cracks and splitting cracks, respectively.