射流速度对水射流破岩影响效果数值试验研究

Numerical Experiments on the Effects of Water Jet Velocity on Rock Breaking

水射流破岩技术在许多工程领域有着广泛的应用,但是其破岩效率影响因素众多,作用机理复杂。通过建立水射流数值模型,运用动态非线性有限元法,基于ANSYS/LS-DYNA进行不同井深条件下射流速度对岩石破坏效率影响研究,结果表明:射流速度对高压水射流破岩的影响较大,水射流冲击岩石在接触部位附近形成应力集中,岩石的塑性应变围绕射流孔径大致呈对称变化规律,随着射流速度增加,破岩深度迅速增加,两者呈线性关系增长。

Water jet rock breaking technology has been widely used in many engineering fields, but its rock breaking efficiency has many influencing factors. Water jet breaking rock mechanism is complicated. A numerical model of water jet was established in this paper. The dynamic nonlinear finite element method is used to study the effects of jet velocity on rock failure efficiency under different well depth conditions based on ANSYS/LS-DYNA. The results show that jet velocity has greater impacts on high-pressure water jet rock breaking. Water jet impacts rock formation stress concentration near the contact site. The plastic strain of the rock changes symmetrically around the jet aperture. As the jet velocity increases, the rock breaking depth increases rapidly. The jet velocity and the rock breaking depth are basically linear.