节理岩体声发射特性试验研究
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摘要
天然岩体为特殊结构的不连续体,其声发射特性要比岩块复杂的多。以0°,30°,45°,60°,90°倾角节理试件为研究对象,开展了单轴压缩条件下的声发射试验。研究表明:受节理影响,不同倾角节理试件的应力应变关系有较大差异,这与其不同破坏模式有关;岩石变形破坏过程中的应力应变关系与其声发射特性一一对应,声发射过程中的撞击数和能量代表试件内部微小结构的破坏数量;节理试件的破坏模式不同,导致节理试件的声发射特性具有明显差异。
Natural rock masses is a discontinuous material with special structure, and its acoustic emission characteristics are more complicated than rock blocks. In this paper, the 0°, 30°, 45°, 60°, and 90° dip joint specimens were used as the research object to carry out the acoustic emission test under uniaxial compression. The research shows that the stress-strain relationship of different dip joint specimens is greatly affected by joints, which is related to different failure modes. The stress-strain relationship in rock deformation and failure is in one-to-one correspondence with acoustic emission characteristics. The number of impacts and energy represent the number of damages of the tiny structures inside the specimen. The failure mode of the joint test piece is different, which results in obvious difference in the acoustic emission characteristics of the joint test piece.
Natural rock masses is a discontinuous material with special structure, and its acoustic emission characteristics are more complicated than rock blocks. In this paper, the 0°, 30°, 45°, 60°, and 90° dip joint specimens were used as the research object to carry out the acoustic emission test under uniaxial compression. The research shows that the stress-strain relationship of different dip joint specimens is greatly affected by joints, which is related to different failure modes. The stress-strain relationship in rock deformation and failure is in one-to-one correspondence with acoustic emission characteristics. The number of impacts and energy represent the number of damages of the tiny structures inside the specimen. The failure mode of the joint test piece is different, which results in obvious difference in the acoustic emission characteristics of the joint test piece.
引文
[1]冶金工业部金属研究所.声发射[M].北京:科学出版社,1972.
[2]孙旭曙,李建林,王乐华,等.节理岩体超声测试及单轴压缩试验研究[J].岩土力学, 2014, 35(12):3473-3478,3488.
[3]曹吉胜,戴前伟,马德鹏.预制节理岩体卸荷损伤破坏机理及声发射特征试验研究[J].中南大学学报(自然科学版), 2018, 49(6):1465-1471.
[4]李银平,曾静,陈龙珠,等.含预制裂隙大理岩破坏过程声发射特征研究[J].地下空间, 2004, 24(3):290-293.
[5]赵兴东,李元辉,袁瑞甫,等.基于声发射定位的岩石裂纹动态演化过程研究[J].岩石力学与工程学报, 2007,26(5):944-950.
[6]裴建良,刘建锋,左建平,等.基于声发射定位的自然裂隙动态演化过程研究[J].岩石力学与工程学报, 2013,32(4):696-704.
[7]赵小平,陈淑芬.基于声发射振幅分布的裂隙岩体破坏演化过程[J].岩石力学与工程学报,2015,34(S1):3012-3017.
[2]孙旭曙,李建林,王乐华,等.节理岩体超声测试及单轴压缩试验研究[J].岩土力学, 2014, 35(12):3473-3478,3488.
[3]曹吉胜,戴前伟,马德鹏.预制节理岩体卸荷损伤破坏机理及声发射特征试验研究[J].中南大学学报(自然科学版), 2018, 49(6):1465-1471.
[4]李银平,曾静,陈龙珠,等.含预制裂隙大理岩破坏过程声发射特征研究[J].地下空间, 2004, 24(3):290-293.
[5]赵兴东,李元辉,袁瑞甫,等.基于声发射定位的岩石裂纹动态演化过程研究[J].岩石力学与工程学报, 2007,26(5):944-950.
[6]裴建良,刘建锋,左建平,等.基于声发射定位的自然裂隙动态演化过程研究[J].岩石力学与工程学报, 2013,32(4):696-704.
[7]赵小平,陈淑芬.基于声发射振幅分布的裂隙岩体破坏演化过程[J].岩石力学与工程学报,2015,34(S1):3012-3017.