SEISMOLOGY AND GEOLOGY ›› 1988, Vol. 10 ›› Issue (2): 75-80.

• Brief Report • Previous Articles     Next Articles

AN EXPERIMENTAL STUDY ON THE CHARACTERISTICS OF ELASTIC WAVE PROPAGATION IN MARBLE SPECIMEN UNDER TRUE TRIAXIAL COMPRESSION

Hua Pei-zhong, Xu Zhao-yong, Li Pei-lin, Han Ming   

  1. Seismologica1 Bureau of Yunnan Province
  • Received:1986-09-30 Online:1988-06-01 Published:2009-11-25

真三轴压缩下大理岩试件中弹性波传播特性的实验研究

华培忠, 许昭永, 李佩林, 韩明   

  1. 云南省地震局
  • 基金资助:
    地震学联合基金

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(σ123) 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.

Key words: True triaxial compression, Elastic wave, Stress

摘要: 在σ123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σ2(x方向)和σ3(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。

关键词: 真三轴压缩, 弹性波, 应力