基于高压水射流破岩的岩石损伤破坏效应研究

Study on the Rock Damage Fracture Effect Based on the High Pressure Water Jet Rock Breaking

由于高压水射流破岩的影响因素繁多和作用机理的复杂,运用动态非线性有限元法,进行高压射流的数值试验,分析破岩过程中应力及破岩深度变化,以破岩过程中诸如射流速度、射流直径、射流入射角度、射流束数等控制参数为研究方向,基于ANSYA/LS-DYNA进行不同井深条件岩石破坏的显示动力有限元分析。结果表明,进行高压水射流破岩时选取不同射流控制参数所实现的射流效率明显不同,射流速度和射流直径的增大都会增加破岩的深度;射流垂直入射时,破岩效果最好;射流束数和破岩深度成反比。以本文研究结果指导实际现场操作,可以有效提高破岩效率。

Because of many influence factors and complex mechanism of the high pressure water jet for impacting rock,numerical experiments of high pressure water jet have been done using dynamic nonlinear FEM. Analysis of the changes of stress and rock breaking depth in the process of rock breaking was carried out to study the control parameters of the rock breaking process by high pressure water jet,such as jet velocity,jet diameter,jet incident angle,the number of jet bundle,etc. Based on ANSYA / LS-DYNA,the damage of rock in different well depth was analyzed.The results showed that： different jet control parameters have the obviously different jet efficiency. The increase of jet velocity and jet diameter will increase the depth of the rock breaking. The rock fragmentation effect is the best when the water jet runs vertically. The increase of jet bundle will decrease the depth of the rock breaking. With the results of the study in this paper to guide actual site operation can effectively improve the efficiency of rock fragmentation.