裂隙煤体单轴压缩能量耗散离散元分析
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摘要
利用3dec数值模拟软件模拟不同倾角贯通裂隙煤岩单轴压缩实验,通过统计分析岩块破坏时块体单元劣化数和子接触劣化数,得出不同倾角裂隙煤岩单轴压缩能量损耗机制。试验结果表明:接触面倾角在0°～30°范围内的岩样能量损耗主要由块体单元劣化引起,接触面倾角在45°～60°范围内的岩样损伤主要由子接触劣化引起;面储能以及面法向能峰值随接触面倾角增大而减小,面切向能随倾角增大而增大,在单轴压缩应力环境下,面切向能释放是导致接触面滑移的原因。
The 3 dec numerical simulation software was used to simulate uniaxial compression experiments of fractured coal and rock with different inclination angles.The energy loss mechanism of uniaxial compression of fractured coal and rock with different inclination angles was obtained by statistical analysis on deterioration numbers of block unit and sub-contact during rock block failure.The experimental results were concluded as follows.Firstly,the energy loss of rock samples with contact angle of 0°～30°was mainly caused by the block units deterioration,and the damage of rock samples with contact angle of 45°～60°was mainly caused by sub-contact deterioration.Secondly,with the increase of the contact angle,the surface energy storage and the peak value of normal energy decreased,and the tangential energy increased.Thirdly,under uniaxial compressive stress,the release of surface tangential energy was the cause of contact slip.
The 3 dec numerical simulation software was used to simulate uniaxial compression experiments of fractured coal and rock with different inclination angles.The energy loss mechanism of uniaxial compression of fractured coal and rock with different inclination angles was obtained by statistical analysis on deterioration numbers of block unit and sub-contact during rock block failure.The experimental results were concluded as follows.Firstly,the energy loss of rock samples with contact angle of 0°～30°was mainly caused by the block units deterioration,and the damage of rock samples with contact angle of 45°～60°was mainly caused by sub-contact deterioration.Secondly,with the increase of the contact angle,the surface energy storage and the peak value of normal energy decreased,and the tangential energy increased.Thirdly,under uniaxial compressive stress,the release of surface tangential energy was the cause of contact slip.
引文
[1]谢和平,彭瑞东,鞠杨.岩石变形破坏过程中能量耗散分析[J].岩石力学与工程学报,2004,23(21):3565-3570.
[2]谢和平,鞠杨,黎立云.基于能量耗散与释放原理的岩石强度与整体破坏准则[J].岩石力学与工程学报,2005,24(17):3003-3010.
[3]谢和平,彭瑞东,鞠杨,等.岩石破坏的能量分析初探[J].岩石力学与工程学报,2005,24(15):2603-2608.
[4]郑在胜.岩石变形中的能量传递过程与岩石变形动力学分析[J].中国科学,1990,B(5):524-537.
[5]刘小明,李焯芬.脆性岩石损伤力学分析与岩爆损伤能量指数[J].岩石力学与工程学报,1997,16(2):140-147.
[6]尤明庆,华安增.岩石岩样单轴压缩的破坏形式与承载能力的降低[J].岩石力学与工程学报,1998,17(3):292-296.
[7]杨圣奇,徐卫亚,苏承东.岩样单轴压缩变形破坏与能量特征研究[J].固体力学学报,2006,27(2):213-216.
[8]杨圣奇,徐卫亚,苏承东.大理岩三轴压缩变形破坏与能量特征研究[J].工程力学,2007,24(1):136-142.
[9]喻勇,尹健民.三峡花岗岩在不同加载方式下的能耗特征[J].岩石力学与工程学报,2004,23(2):205-208.
[10]金丰年,蒋美蓉,高小玲.基于能量耗散定义损伤变量的方法[J].岩石力学与工程学报,2004,23(12):1976-1980.
[2]谢和平,鞠杨,黎立云.基于能量耗散与释放原理的岩石强度与整体破坏准则[J].岩石力学与工程学报,2005,24(17):3003-3010.
[3]谢和平,彭瑞东,鞠杨,等.岩石破坏的能量分析初探[J].岩石力学与工程学报,2005,24(15):2603-2608.
[4]郑在胜.岩石变形中的能量传递过程与岩石变形动力学分析[J].中国科学,1990,B(5):524-537.
[5]刘小明,李焯芬.脆性岩石损伤力学分析与岩爆损伤能量指数[J].岩石力学与工程学报,1997,16(2):140-147.
[6]尤明庆,华安增.岩石岩样单轴压缩的破坏形式与承载能力的降低[J].岩石力学与工程学报,1998,17(3):292-296.
[7]杨圣奇,徐卫亚,苏承东.岩样单轴压缩变形破坏与能量特征研究[J].固体力学学报,2006,27(2):213-216.
[8]杨圣奇,徐卫亚,苏承东.大理岩三轴压缩变形破坏与能量特征研究[J].工程力学,2007,24(1):136-142.
[9]喻勇,尹健民.三峡花岗岩在不同加载方式下的能耗特征[J].岩石力学与工程学报,2004,23(2):205-208.
[10]金丰年,蒋美蓉,高小玲.基于能量耗散定义损伤变量的方法[J].岩石力学与工程学报,2004,23(12):1976-1980.