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NUMERICAL SIMULATION STUDY ON ROCK BREAKING MECHANISM AND PROCESS UNDER HIGH PRESSURE WATER JET
作者姓名:倪红坚  王瑞和  张延庆
作者单位:College of Petroleum Engineering China University of Petroleum (East China),College of Petroleum Engineering China University of Petroleum (East China),College of Building Engineering Beijing University of Technology Dongying 257061,Shandong Province,P.R.China,Dongying 257061,Shandong Province,P.R.China,Beijing 100022 P. R. China
基金项目:Project supported by the National Natural Science Foundation of China (Nos.50574062 and 50234030) the Post-Doctoral Science Foundation of China (No.2004035692)
摘    要: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 milliseconds, 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.

关 键 词:数字模拟  岩石破裂机制  高压水喷处理  有限元法  喷射钻井
文章编号:0253-4827(2005)12-1595-10
收稿时间:2004-11-09
修稿时间:2005-08-17

Numerical simulation study on rock breaking mechanism and process under high pressure water jet
Hong-jian Ni,Rui-he Wang,Yan-qing Zhang.NUMERICAL SIMULATION STUDY ON ROCK BREAKING MECHANISM AND PROCESS UNDER HIGH PRESSURE WATER JET[J].Applied Mathematics and Mechanics(English Edition),2005,26(12):1595-1604.
Authors:Hong-jian Ni  Rui-he Wang  Yan-qing Zhang
Institution:1. College of Petroleum Engineering, China University of Petroleum East China,Dongying 257061, Shandong Province, P. R. China
2. College of Building Engineering, Beijing University of Technology,Beijing 100022, P.R.China
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 milliseconds, 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.
Keywords:water jet  rock breakage  rock damage model  fluid-wall interaction  finite element method
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