| 真三轴压缩下大理岩试件中弹性波传播特性的实验研究 |
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| 引用本文： | 华培忠,许昭永,李佩林,韩明.真三轴压缩下大理岩试件中弹性波传播特性的实验研究[J].地震地质,1988,10(2):75. |
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| 作者姓名： | 华培忠 许昭永 李佩林 韩明 |
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| 作者单位： | 云南省地震局
(华培忠，许昭永，李佩林)，云南省地震局(韩明) |
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| 摘 要： | 在σ_1>σ_2>σ_3的真三轴压缩试验机上进行了弹性波在大理岩试件中传播时沿σ_2(x方向)和σ_3(y方向)的走时、幅值及衰减特性的实验研究。随着载荷应力增加,在x方向上,P波第一个波峰的走时t减小,幅值A减小;在y方向则相反。大约从破坏应力的95%开始,两个方向上t又都迅速增加,A减小,波列振幅衰减系数K也减小,这是真三轴压缩情况下的一种破裂前兆变化特征。Ⅰ型应力途径t开始迅速增加时的差应力值低于Ⅱ型
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| 关 键 词： | 真三轴压缩 弹性波 应力 |
AN EXPERIMENTAL STUDY ON THE CHARACTERISTICS OF ELASTIC WAVE PROPAGATION IN MARBLE SPECIMEN UNDER TRUE TRIAXIAL COMPRESSION |
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| Hua Pei-zhong,Xu Zhao-yong,Li Pei-lin and Han Ming.AN EXPERIMENTAL STUDY ON THE CHARACTERISTICS OF ELASTIC WAVE PROPAGATION IN MARBLE SPECIMEN UNDER TRUE TRIAXIAL COMPRESSION[J].Seismology and Geology,1988,10(2):75. |
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| Authors: | Hua Pei-zhong Xu Zhao-yong Li Pei-lin and Han Ming |
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| Institution: | Seismologica1 Bureau of Yunnan Province |
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| Abstract: | An experimental study on the travel time, magnitude and attenuation characteristics of elastic wave propagating along σ2(x direction)and σ3 (y direction) in marble specimen has been carried out using a true triaxial (σ1>σ2>σ3) compression apparatus. With increasing stress the travel time t and magnitude A of the first peak of P wave decrease, on the contrary while along the y direction it gives a completely opposite result. Starting from 95% of failure strength along both directions t increases rapidly, but A decreases and the attenuation coefficient K of wave magnitude also decreases. This phenomenon is considered as a characteristic change of the fracturing forerunners under true triaxial compression. For the I way of applying stress to the specimen the differential stress at the moment of rapid increase of t value is lower than that for the I way |
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| Keywords: | True triaxial compression Elastic wave Stress |
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