粒子浆液射流冲击下岩石动态损伤及破坏效应

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摘要粒子浆液射流破岩过程涉及大变形、高应变及强载荷，表现为钢粒-浆液-岩石之间非线性动态耦合问题。针对岩石损伤瞬时多变性及观测困难等问题，开展了粒子与浆液射流冲击下岩石的动态损伤机理及破坏效应研究。首先，基于光滑粒子动力学–有限元模拟（smoothed particle hydrodynamics–finite element method ，SPH–FEM）耦合算法描述了粒子-浆液冲击破岩的建模方法，然后结合JH-Ⅱ（Johnson-Holmquist-Ⅱ）模型与Rankine拉伸断裂软化模型建立了岩石损伤本构模型，对粒子浆液射流冲击破岩过程及损伤机理进行了动态模拟。研究结果表明：岩石的损伤破坏主要以纵向扩展为主，具有瞬时性与阶跃性特征，呈现出“从累积损伤到不断破坏”的循环过程；岩石破坏机理以剪切破碎和拉伸裂纹为主。同时，通过实验和数值模拟对比验证了破岩样本的形态，并分析了冲击速度、角度与粒子尺寸对破岩效应的影响规律。研究结果对于粒子浆液冲击钻井破岩理论的发展具有重要意义。

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	方天成1
	刘汉旭1
	张园2
	程建勋1
	任福深1

关键词 ：浆液射流；粒子冲击；光滑粒子动力学&ndash, 有限元模拟（SPH&ndash, FEM）；岩石损伤；动态演化；数值模拟；破坏效应

Abstract：Particle slurry jet impact rock-breaking process involves large deformation, high strain and strong loads, which is characterized by complex-nonlinear-dynamic-coupled problem among steel particles, slurry and rock. Aiming at the problems of instantaneity and difficult observation of rock-breaking process, damage mechanism and failure effect of rock with particle slurry jet impact were studied. Based on smoothed particle hydrodynamics–finite element method （SPH–FEM ）coupled algorithm, modeling method of particle slurry impact rock was described. Afterwards, the rock damage constitutive model was established by combining Johnson-Holmquist-Ⅱ（JH-Ⅱ） model and Rankine tensile fracture soft model, and dynamical simulation of particle slurry jet impact rock-breaking process was carried out. The results showed that the damage of rock was mainly longitudinal propagation, with instantaneity and step property, which was a cycle process of “from damage accumulation to continuous fracture”; and the rock failure mechanism was mainly characterized by tensile crack, and shear powder. Meanwhile, the morphology of rock-breaking samples was compared and verified by experiment and numerical simulation, and influence laws of impact velocity, angle and particle size on rock-breaking effect were analyzed. This research would be of great significance for the development of particle slurry jet impact rock-breaking theory.

Key words： slurry jet particle impact smoothed particle hydrodynamics–finite element method （SPH–FEM） rock damage dynamical evolution simulation failure effect

收稿日期: 2021-03-01 出版日期: 2021-12-28

引用本文:

方天成1，刘汉旭1，张园2，程建勋1，任福深1. 粒子浆液射流冲击下岩石动态损伤及破坏效应[J]. 振动与冲击, 2021, 40(24): 107-118.
FANG Tiancheng1，LIU Hanxu1，ZHANG Yuan2，CHENG Jianxun1，REN Fushen1. Dynamical response and failure effect of rock with particle slurry jet impact. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(24): 107-118.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I24/107

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