Study on the Fracturing of Rock by High-Speed Water Jet Impact

Due to the opaqueness of rock and limitation detection technology, it is impossible accurately describe crack growth process determine law breakage. Based on smoothed particle hydrodynamics finite element method (SPH-FEM), a numerical model for high-speed water jet breaking was established in this work simulate fragmentation impacted by jet, study effects different angles propagation microscopic cracks inside rock. Additionally, we further analyzed impact angle trend applying confining pressure Theoretical experimental analyses showed that inclination determined direction axial tension-type center. When exceeded 20°, ability erosion insufficient, efficiency low. However, range 15° capacity strong, lamellar obvious, chip block spalling easily produced. The at varying under will make deviate from without gradually become parallel plane, thereby promoting unilateral impact, making more likely produce spalling.