矿物相互作用对岩石单轴抗压强度的影响研究
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摘要
针对岩石矿物颗粒之间的相互作用程度不同的特点,采用弯矩贡献因子■模拟了岩石矿物颗粒之间的相互作用力的强弱。依据花岗岩室内单轴压缩试验曲线对细观参数进行了识别。在此基础上,定量研究了■对岩石类材料的变形、强度特征以及微裂纹行为的影响。以4种室内单轴压缩应力应变曲线来验证弯矩贡献因子的适用性。结果表明:■对峰值强度、拉剪裂纹比重以及破坏模式的影响很大;随■的增加,峰值强度呈现线性减小的规律,拉剪裂纹比重呈现指数型增长规律,破坏模式也从对角型破坏面逐渐发展为"V"型破坏面;通过调整■,模拟得到的曲线与室内试验应力应变曲线良好吻合。
We employed the moment contribution factorto simulate the interaction degree among mineral particles of rock mass. The microscopic parameters were identified by the uniaxial compression test curves of Beishan granite. On the basis of this, the influence of moment contribution factor on deformation, strength characteristics and micro-cracking behavior of rock materials were quantitatively studied. Finally, four kinds of laboratory uniaxial compressive stress-strain curves were used to verify the applicability of the. The results showed that had a great influence on the peak strength, ratio of tensile cracks to shear cracks as well as failure mode. With the increase of the, a linear decreasing and exponential growing trends appear for the peak strength and cracks ratio respectively, while the failure mode had also evolved from a diagonal failure surface to a "V" failure surface. Through the adjustment of, the simulated results were in good agreement with the laboratory stress-strain curves.
We employed the moment contribution factorto simulate the interaction degree among mineral particles of rock mass. The microscopic parameters were identified by the uniaxial compression test curves of Beishan granite. On the basis of this, the influence of moment contribution factor on deformation, strength characteristics and micro-cracking behavior of rock materials were quantitatively studied. Finally, four kinds of laboratory uniaxial compressive stress-strain curves were used to verify the applicability of the. The results showed that had a great influence on the peak strength, ratio of tensile cracks to shear cracks as well as failure mode. With the increase of the, a linear decreasing and exponential growing trends appear for the peak strength and cracks ratio respectively, while the failure mode had also evolved from a diagonal failure surface to a "V" failure surface. Through the adjustment of, the simulated results were in good agreement with the laboratory stress-strain curves.
引文
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[15] 周博,汪华斌,赵文锋,等.黏性材料细观与宏观力学参数相关性研究[J].岩土力学,2012,33(10):3171-3178.
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[17] 赵国彦,戴兵,马驰.平行黏结模型中细观参数对宏观特性影响研究[J].岩石力学与工程学报,2012,31(7):1491-1498.
[18] 牛林新,辛酉阳.基于正交设计的颗粒流模型宏细观参数相关分析:以岩石单轴压缩数值试验为例[J].人民长江,2015,46(16):53-57.
[19] 周天白,杨小彬,韩心星.煤岩单轴压缩破坏PFC(2D)数值反演模拟研究[J].矿业科学学报,2017,2(3):260-266.
[2] 杨科,袁亮,祁连光,等.淮南矿区11-2煤顶板岩石单轴抗压强度预测模型构建[J].岩石力学与工程学报,2013(10):1991-1998.
[3] 祁连光,杨科,陆伟,等.煤系地层岩石单轴抗压强度统计分析[J].煤炭科学技术,2013,41(2):100-103.
[4] 王浩,牟宗龙,易恩兵,等.基于正态分布置信区间分析法求岩石单轴抗压强度[J].煤炭科学技术,2013,41(4):13-15.
[5] 赵洪宝,王中伟,李伟,等.岩样单轴抗压强度区间估计分析[J].重庆大学学报,2016,39(3):58-67.
[6] 张威,刘新义,郑小燕.矿物成分强度对岩石单轴抗压强度的影响[J].科学技术与工程,2012,30(12):8085-8088.
[7] 赵斌,王芝银,伍锦鹏.矿物成分和细观结构与岩石材料力学性质的关系[J].煤田地质与勘探,2013(3):59-63.
[8] 刘广,荣冠,彭俊,等.矿物颗粒形状的岩石力学特性效应分析[J].岩土工程学报,2013,35(3):540-550.
[9] 刘东,谢婷蜓,马刚,等.颗粒形状对堆石体真三轴数值试验力学特性的影响[J].水电能源科学,2011,29(9):68-71.
[10] Itasca Consulting Group Inc.PFC manual (version 5.0)[Z].Minneapolis,Itasca Consulting Group Inc,2018.
[11] Potyondy D O,Cundall P A.A bonded-particle model for rock[J].International Journal of Rock Mechanics & Mining Sciences,2004,41(8):1329-1364.
[12] Ding X B,Zhang L Y.A new contact model to improve the simulated ratio of unconfined compressive strength to tensile strength in bonded particle models[J].International Journal of Rock Mechanics and Mining Sciences,2014(69):111-119.
[13] Potyondy D O.The bonded-particle model as a tool for rock mechanics research and application[C]//Proceedings of the seventh Asian rock mechanics symposium,Seoul,2012:14-19.
[14] 丛宇,王在泉,郑颖人,等.基于颗粒流原理的岩石类材料细观参数的试验研究[J].岩土工程学报,2015,37(6):1031-1040.
[15] 周博,汪华斌,赵文锋,等.黏性材料细观与宏观力学参数相关性研究[J].岩土力学,2012,33(10):3171-3178.
[16] 尹成薇,梁冰,姜利国.基于颗粒流方法的砂土宏-细观参数关系分析[J].煤炭学报,2011(s2):264-267.
[17] 赵国彦,戴兵,马驰.平行黏结模型中细观参数对宏观特性影响研究[J].岩石力学与工程学报,2012,31(7):1491-1498.
[18] 牛林新,辛酉阳.基于正交设计的颗粒流模型宏细观参数相关分析:以岩石单轴压缩数值试验为例[J].人民长江,2015,46(16):53-57.
[19] 周天白,杨小彬,韩心星.煤岩单轴压缩破坏PFC(2D)数值反演模拟研究[J].矿业科学学报,2017,2(3):260-266.