含2条断续裂隙试件直接拉伸下的颗粒流模拟
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摘要
采用颗粒流程序PFC构建了试件直接拉伸模型,模拟了含2条断续裂隙试件的直接拉伸试验,通过完整试件的模拟结果与室内试验结果的对比,验证了细观参数的准确性和可靠性,同时分析了裂隙倾角和岩桥倾角对抗拉强度和裂纹扩展的影响。研究表明:在直接拉伸情况下,含2条断续裂隙试件以萌生次生倾斜反翼裂纹为主,少量次生共面裂纹和翼裂纹;岩桥倾角和裂隙倾角均较小时,次生共面裂纹与原始裂隙之间发生搭接、贯通,随着岩桥倾角和裂隙倾角的加大,次生倾斜反翼裂纹扩展使试件断裂;裂纹扩展的方向与最大拉应力的方向基本保持垂直;岩桥倾角对于试件的抗拉强度和起裂应力影响不大;裂隙倾角对于试件抗拉强度和起裂应力影响明显,裂隙倾角越大,试件抗拉强度和起裂应力越大。
The direct tensile model of specimen was constructed by particle flow software PFC.The direct tensile test of two non-persistent flaw specimens was simulated.The comparison between the simulation results of the complete specimen and the indoor test results confirms the accuracy and reliability of the parameters,and the influence of the flaw and the rock bridge of the inclination on the tensile strength and crack propagation are also analyzed.The results show that under direct tension,two non-persistent flaw specimens are mainly composed of oblique secondary crack,and a small number of quasi-coplanar secondary cracks and wing cracks.When the inclination of the rock bridge and the cracks are small,the direction of the crack propagation is basically perpendicular to the direction of the maximum tensile stress.The direction of the cracks is the same as the direction of the maximum tensile stress.The inclination angle of the rock bridge has little effect on the tensile strength and the initiation stress.There is obvious influence of the crack angle on the tensile strength and the initiation stress of the specimen.The tensile strength and the initiation stress increase with the increase of the inclination angle of the flaw.
The direct tensile model of specimen was constructed by particle flow software PFC.The direct tensile test of two non-persistent flaw specimens was simulated.The comparison between the simulation results of the complete specimen and the indoor test results confirms the accuracy and reliability of the parameters,and the influence of the flaw and the rock bridge of the inclination on the tensile strength and crack propagation are also analyzed.The results show that under direct tension,two non-persistent flaw specimens are mainly composed of oblique secondary crack,and a small number of quasi-coplanar secondary cracks and wing cracks.When the inclination of the rock bridge and the cracks are small,the direction of the crack propagation is basically perpendicular to the direction of the maximum tensile stress.The direction of the cracks is the same as the direction of the maximum tensile stress.The inclination angle of the rock bridge has little effect on the tensile strength and the initiation stress.There is obvious influence of the crack angle on the tensile strength and the initiation stress of the specimen.The tensile strength and the initiation stress increase with the increase of the inclination angle of the flaw.
引文
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[20]Zhao Weihua,Huang Runqiu,Yan Ming.Study on the deformation and failure modes of rock mass containing concentrated parallel joints with different spacing and number based on smooth joint model in PFC[J].Arabian Journal of Geosciences,2015,8(10):7887-7897.
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[23]周喻,吴庆良,杜晓伟,等.岩石厚壁圆筒试验破坏的细观力学机制[J].岩石力学与工程学报,2016,35(9):1854-1863.
[24]Pierce M E,Fairhurst C.Synthetic rock mass applications in mass mining[C]∥12th ISRM Congress,16-21 October,Beijing,China,2012:109-114.
[25]陶建明,熊承仁,温韬,等.基于PFC3D的岩石单轴压缩变形破坏特征分析[J].人民长江,2016,47(13):60-65.
[26]张海磊,邓青林,侯俊,等.单轴拉伸作用下岩石裂隙起裂扩展的数值模拟[J].黄金,2016,37(10):35-39.
[2]喻勇,徐跃良.采用平台巴西圆盘试样测试岩石抗拉强度的方法[J].岩石力学与工程学报,2006,25(7):1457-1462.
[3]尤明庆,苏承东.平台巴西圆盘劈裂和岩石抗拉强度的试验研究[J].岩石力学与工程学报,2004,23(18):3106-3112.
[4]于庆磊,唐春安,杨天鸿,等.平台中心角对岩石抗拉强度测定影响的数值分析[J].岩土力学,2008,29(12):3251-3255.
[5]黄耀光,王连国,陈家瑞,等.平台巴西劈裂试验确定岩石抗拉强度的理论分析[J].岩土力学,2015,36(3):739-748.
[6]邓华锋,李建林,朱敏,等.圆盘厚径比对岩石劈裂抗拉强度影响的试验研究[J].岩石力学与工程学报,2012,31(4):792-798.
[7]张绪涛,张强勇,袁圣渤,等.岩石轴向直接拉伸试验装置的研制及应用[J].岩石力学与工程学报,2014,23(12):2517-2523.
[8]余贤斌,王青蓉,李心一,等.岩石直接拉伸与压缩变形的试验研究[J].岩土力学,2008,29(1):18-22.
[9]余贤斌,谢强,李心一,等.直接拉伸、劈裂及单轴压缩试验下岩石的声发射特征[J].岩石力学与工程学报,2007,26(1):137-142.
[10]李地元,李夕兵,Lic Charlie.2种岩石直接拉压作用下的力学性能试验研究[J].岩石力学与工程学报,2010,29(3):624-632.
[11]刘世奇,李海波,李俊如,等.有侧向压力的岩石材料动态直接拉伸试验装置[J].岩土力学,2007,28(11):2365-2368.
[12]蒲成志,曹平,衣永亮.单轴压缩下预制2条贯通裂隙类岩材料断裂行为[J].中南大学学报:自然科学版,2012,43(7):2708-2716.
[13]邵冬亮.含充填断续节理岩体裂隙扩展试验与数值模拟研究[D].济南:山东大学,2012.
[14]Haeril H,Shahriar K,Marji M F.Cracks coalescence mechanism and cracks propagation paths in rock-like specimens containing pre-existing random cracks under compression[J].Orbis-prague,2014,21(6):2404-2414.
[15]Bi J,Zhou X P,Qian Q H.The 3Dnumerical simulation for the propagation process of multiple pre-existing flaws in rock-like materials subjected to biaxial compressive loads[J].Rock Mechanics and Rock Engineering,2016,49(5):1-17.
[16]王向刚.脆性材料中三维裂隙破坏过程试验与数值模拟研究[D].济南:山东大学,2014.
[17]Fu Jin-wei,Chen Kui,Zhu Wei-shen,et al.Progressive failure of new modelling material with a single internal crack under biaxial compression and the 3-D numerical simulation[J].Engineering Fracture Mechanics,2016,165:140-152.
[18]Itasca Consulting Group Inc.PFC,Version 5.0[M].Minneapolis:Itasca Consulting Group Inc,2014.
[19]杨圣奇,黄彦华,刘相如.断续双裂隙岩石抗拉强度与裂纹扩展颗粒流分析[J].中国矿业大学学报,2014,43(2):220-226.
[20]Zhao Weihua,Huang Runqiu,Yan Ming.Study on the deformation and failure modes of rock mass containing concentrated parallel joints with different spacing and number based on smooth joint model in PFC[J].Arabian Journal of Geosciences,2015,8(10):7887-7897.
[21]Diederichs M S.Instablity of hard rock masses,the role of tensile damage and relaxation[D].Waterloo:University of Waterloo,1999.
[22]Potyondy D O.A flat-jointed bonded-particle material for hard rock[C]∥Proceedings of the 46th Rock Mechanics/Geomechanics Symposium.Chicago:IL,American Rock Mechanics Association,2012.
[23]周喻,吴庆良,杜晓伟,等.岩石厚壁圆筒试验破坏的细观力学机制[J].岩石力学与工程学报,2016,35(9):1854-1863.
[24]Pierce M E,Fairhurst C.Synthetic rock mass applications in mass mining[C]∥12th ISRM Congress,16-21 October,Beijing,China,2012:109-114.
[25]陶建明,熊承仁,温韬,等.基于PFC3D的岩石单轴压缩变形破坏特征分析[J].人民长江,2016,47(13):60-65.
[26]张海磊,邓青林,侯俊,等.单轴拉伸作用下岩石裂隙起裂扩展的数值模拟[J].黄金,2016,37(10):35-39.