| 混合花岗岩加载细观力学特性及破裂演化规律 |
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| 引用本文： | 苗胜军,杨志军,龙超,任奋华.混合花岗岩加载细观力学特性及破裂演化规律[J].江苏大学学报(自然科学版),2012,33(4):469-473. |
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| 作者姓名： | 苗胜军 杨志军 龙超 任奋华 |
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| 作者单位： | 1. 北京科技大学 金属矿山高效开采与安全教育部重点实验室,北京 100083;北京科技大学 土木与环境工程学院,北京 100083
2. 中铁资源集团有限公司,北京,100039 |
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| 基金项目： | 国家自然科学基金资助项目(11002021);中央高校基本科研业务费专项资金资助项目(FRF-BR-10-029B) |
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| 摘 要： | 根据室内试验获得的岩石宏观物理力学参数及岩样切片扫描图,基于颗粒流理论和PFC程序建立混合花岗岩颗粒细观几何模型,标定模型材料细观力学参数,采用Fish语言编制加载命令流并调整相应函数,对岩石单轴和三轴压缩试验进行模拟.通过对试验与模拟应力-应变曲线、AE声发射与PFC程序中“Crack”裂纹监测成果等的综合比较研究,获得荷载作用下杏山铁矿-45 m水平混合花岗岩细观力学特性、微破裂行为以及岩石微裂隙发展与宏观破裂演化规律.通过对混合花岗岩单轴和不同围压下三轴压缩PFC模拟曲线与室内试验结果的比较可知,PFC模拟能准确地表征荷载下岩石颗粒的细观力学特性和运动学行为.
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| 关 键 词： | 混合花岗岩 颗粒流 键结颗粒模型 力学特性 破裂 |
Micro-mechanical characteristics and cracks revolution laws of migmatitic granite under different loading conditions |
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| Miao Shengjun
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Yang Zhijun
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Long Chao
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Ren Fenhua.Micro-mechanical characteristics and cracks revolution laws of migmatitic granite under different loading conditions[J].Journal of Jiangsu University:Natural Science Edition,2012,33(4):469-473. |
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| Authors: | Miao Shengjun Yang Zhijun Long Chao Ren Fenhua |
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| Institution: | 1,2(1.State Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines,University of Science and Technology Beijing,Beijing 100083,China;2.School of Civil and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China;3.China Railway Resources Group Limited Company,Beijing 100039,China) |
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| Abstract: | According to the physical and mechanical parameters from laboratory experiments and the grains section scanning,micro-geometric model and micro-mechanical parameters of migmatitic granite grains were built based on particle flow theory and PFC programs.Loading codes were developed,and some functions were adjusted by Fish language to simulate uniaxial and triaxial compression experiments.Based on comprehensive comparison and analysis of stress-strain curves,acoustic emission and "Crack" monitoring results from laboratory and PFC numerical simulation,the micro-mechanical characteristics and the cracks revolution laws from microcosm to macrocosm of migmatitic granite from-45 m level of Xingshan Iron Mine were obtained under different loading conditions.According to the comparison of simulation results of rock uniaxial compression and triaxial compression at different confining pressures with laboratory experiments,PFC can accurately simulate the micro-mechanical characteristics and kinematic behaviors of rock grains under different loading conditions. |
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| Keywords: | migmatitic granite particle flow bonded particles model mechanical characteristics cracks |
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