含预制裂隙的均质岩石巴西劈裂过程数值模拟
|
摘要
基于改进刚体弹簧方法,对均质圆盘试件和预制裂隙圆盘试件的巴西劈裂过程进行了数值模拟,并对比研究了预制裂隙对巴西劈裂破坏形态的影响。结果表明,均质圆盘的巴西劈裂过程分为三个阶段,即加载端开始向下萌生随机裂隙点;裂隙点之间联结发育;主裂隙贯穿试件造成破坏,次生裂隙发育。对于预制裂隙圆盘试件,不同预制裂隙倾角试件的破坏形式基本一致,由于应力集中,裂纹首先从预制裂隙两端萌生,并向加载端扩展,宏观裂纹形成的同时在加载端部也开始产生次生裂隙,次生裂纹的产状随预制裂隙倾角变化而不同。
Based on the modified rigid body spring method,the Brazilian splitting process of homogeneous disc specimen and prefabricated fracture disk specimen was numerically simulated,and the impact of prefabricated cracks on the Brazilian splitting failure was comparative analysis.The numerical results show that the Brazilian splitting process of homogeneous discs is divided into three stages:the loading ends begin to initiate random fissures;joints develop between fractures;the main fracture passes through the specimen,resulting in damage and secondary fractures initiate.For the prefabricated fractured disc specimen,the failure modes of the prefabricated fissure specimen are basically the same.Due to the stress concentration,the crack first starts from both ends of the prefabricated crack and extends toward the loading end.The secondary cracks initiate at the loading end while mesoscopic crack is formed.The occurrence of secondary cracks varies with the pre-crack inclination.
Based on the modified rigid body spring method,the Brazilian splitting process of homogeneous disc specimen and prefabricated fracture disk specimen was numerically simulated,and the impact of prefabricated cracks on the Brazilian splitting failure was comparative analysis.The numerical results show that the Brazilian splitting process of homogeneous discs is divided into three stages:the loading ends begin to initiate random fissures;joints develop between fractures;the main fracture passes through the specimen,resulting in damage and secondary fractures initiate.For the prefabricated fractured disc specimen,the failure modes of the prefabricated fissure specimen are basically the same.Due to the stress concentration,the crack first starts from both ends of the prefabricated crack and extends toward the loading end.The secondary cracks initiate at the loading end while mesoscopic crack is formed.The occurrence of secondary cracks varies with the pre-crack inclination.
引文
[1]汪成兵.均质岩体中隧道围岩破坏过程的试验与数值模拟[J].岩土力学,2012,33(1):103-108.
[2]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.
[3]潘鹏志,丁梧秀,冯夏庭,等.预制裂纹几何与材料属性对岩石裂纹扩展的影响研究[J].岩石力学与工程学报,2008,27(9):1 882-1 889.
[4]姚池,姜清辉,邵建富,等.一种模拟岩石破裂的细观数值计算模型[J].岩石力学与工程学报,2013,32(S2):3 147-3 153.
[5]蒋伟.不同岩石抗拉与抗压实验对比研究[D].南京:南京大学,2014
[6]姚池,李瑶,姜清辉,等.应力作用下软硬互层岩石破裂过程的细观模拟[J].岩石力学与工程学报,2015,34(8):1 542-1 551.
[7]Amadei B,Rogers J D,Goodman R E.Elastic Constants and Tensile Strength of Anisotropic Rocks[C]//5th ISRM Congress.International Society for Rock Mechanics,1983.
[2]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.
[3]潘鹏志,丁梧秀,冯夏庭,等.预制裂纹几何与材料属性对岩石裂纹扩展的影响研究[J].岩石力学与工程学报,2008,27(9):1 882-1 889.
[4]姚池,姜清辉,邵建富,等.一种模拟岩石破裂的细观数值计算模型[J].岩石力学与工程学报,2013,32(S2):3 147-3 153.
[5]蒋伟.不同岩石抗拉与抗压实验对比研究[D].南京:南京大学,2014
[6]姚池,李瑶,姜清辉,等.应力作用下软硬互层岩石破裂过程的细观模拟[J].岩石力学与工程学报,2015,34(8):1 542-1 551.
[7]Amadei B,Rogers J D,Goodman R E.Elastic Constants and Tensile Strength of Anisotropic Rocks[C]//5th ISRM Congress.International Society for Rock Mechanics,1983.