Numerical Simulation Study on Rock Breaking Mechanism and Process Under High Pressure Water Jet
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摘要: 根据连续介质力学和有限元理论，给出了高压水射流破岩系统中流体和岩石的控制方程，并建立了相应的有限元列式．运用连续损伤力学和细观损伤力学理论，建立了适用于水射流破岩全过程分析的岩石损伤模型以及宏细观损伤的耦合模式．数值计算的结果较真实地反映了水射流破岩过程中，岩石的动态响应以及水射流动力学特性的演化过程，普通连续水射流破碎岩石主体所用的时间为毫秒量级，破岩的主要形式是卸载及射流冲击所产生的拉伸破坏，并呈“阶跃式”发展．数值计算与相关试验结果基本吻合，表明该分析方法是可行的，可用来指导高压水射流破岩理论的进一步研究及应用．Abstract: The numerical simulation method to study rock breaking process and mechanism under high pressure water jet was developed with the continuous mechanics and the FEM theory.The rock damage model and the damage-coupling model suited to analyze the whole process of water jet breaking rock were established with continuum damage mechanics and micro damage mechanics.The numerical results show the dynamic response of rock under water jet and the evolvement of hydrodynamic characteristic of jet during rock breaking is close to reality,and indicates that the body of rock damage and breakage under the general continual jet occurs within several imlliseconds,the main damage form is tensile damage caused by rock unload and jet impact,and the evolvement of rock damage shows a step-change trend.On the whole,the numerical results can agree with experimental conclusions,which manifest that the analytical method is feasible and can be applied to guide the research and application of jet breaking rock theory.
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Key words:
- water jet /
- rock breakage /
- rock damage model /
- fluid-wall interaction /
- finite element method
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[1] 王瑞和,倪红坚.高压水射流破岩机理研究[J].石油大学学报(自然科学版),2002,26(4):118—122. [2] 章本照.流体力学中的有限元方法[M].北京：机械工业出版社,1986. [3] 王勖成,邵敏.有限元基本原理和数值方法[M].北京：清华大学出版社,1997. [4] 王肖钧.高速碰撞中的有限元方法及其应用[J].爆炸与冲击,1993,12(1):296—304. [5] 恽寿榕.爆炸力学计算方法[M].北京:北京理工大学出版社,1995. [6] 陈庭根,管志川. 钻井工程理论与技术[M].山东东营:石油大学出版社，6—41. [7] Furlong J R,Davis J F, Alme M L.Model the dynamic load/unload behavior of ceramics under impact loading[R]. RDA-TR-00.0-0001, Arlington, V A: R & D Associates, Arlington,1990. [8] 杨军,金乾坤,黄风雷.岩石爆破理论模型及数值模拟计算[M].北京:科学出版社,1999. [9] 余寿文,冯西桥.损伤力学[M].北京:清华大学出版社,1997. [10] Lemaitre J. 损伤力学教程[M].陶春虎，倪金刚 译.北京:科学出版社,1996. [11] 徐小荷,余静.岩石破碎学[M].北京：煤炭工业出版社,1984. -
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