水环境中高压水射流成孔的数值模拟
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摘要
为研究水环境中射流速度对成孔深度、成孔直径及射流周边岩体的影响,基于岩石Holmquist-Johnson-Cook(HJC)模型,采用有限元显式动力分析软件LS-DYNA建立了水域中高压水射流成孔的数值模型,模拟了射流成孔过程。结果显示:随着射流速度的增加,成孔深度从最开始的显著增加,转变为缓慢增加,最后稳定;成孔直径与射流直径之比受射流速度影响不大,始终保持在1.5～1.8;水环境中应力波衰减速度快,射流过程对其周边岩体影响较小。研究结果对于高压水射流技术的水下应用有指导作用。
In order to study the influence of jet velocity on the depth of pore,diameter of pore and surrounding rock mass in water environment. Based on rock Holmquist-Johnson-Cook model,the numerical model of high pressure water jet pore formation in water is established by explicit dynamic analysis software LS-DYNA,and the process of jet hole formation is simulated. The results show that: with the increase of jet velocity,the depth of hole formation increases from a significant increase to a slow increase,finally stable; the ratio of the diameter of the hole to the diameter of the jet is not affected by the velocity of the jet,and it is always between 1.5 to 1.8; the attenuation rate of stress wave in water environment is fast,and the jet process has little effect on the surrounding rock mass. The above conclusions are helpful to the underwater application of high pressure water jet technology.
In order to study the influence of jet velocity on the depth of pore,diameter of pore and surrounding rock mass in water environment. Based on rock Holmquist-Johnson-Cook model,the numerical model of high pressure water jet pore formation in water is established by explicit dynamic analysis software LS-DYNA,and the process of jet hole formation is simulated. The results show that: with the increase of jet velocity,the depth of hole formation increases from a significant increase to a slow increase,finally stable; the ratio of the diameter of the hole to the diameter of the jet is not affected by the velocity of the jet,and it is always between 1.5 to 1.8; the attenuation rate of stress wave in water environment is fast,and the jet process has little effect on the surrounding rock mass. The above conclusions are helpful to the underwater application of high pressure water jet technology.
引文
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[2]王瑞和,倪红坚.高压水射流破岩机理研究[J].中国石油大学学报(自然科学版),2002,26(4):118-122.
[3]雷光宇,党发宁,李骞,等.基于高压水射流破岩的岩石损伤破坏效应研究[J].地下空间与工程学报,2015,11(1):34-38.
[4]CHEN H,LI Z,GAO Z,et al.Numerical investigation of rock breaking mechanisms by high pressure water jet[J].Procedia Engineering,2015,126:295-299.
[5]LIU X,LIU S,JI H.Numerical research on rock breaking performance of water jet based on SPH[J].Powder Technology,2015,286:181-192.
[6]王佰顺,丁旭东.水力冲孔喷头结构参数设计及试验研究[J].煤炭工程,2012(7):42-44.
[7]STOXREITER T,Martin A,Teza D,et al.Hard rock cutting with high pressure jets in various ambient pressure regimes[J].International Journal of Rock Mechanics&Mining Sciences,2018,108:179-188.
[8]方秦,孔祥振,吴昊,等.岩石Holmquist-Johnson-Cook模型参数的确定方法[J].工程力学,2014,31(3):197-204.