摘要
通过超声波对单轴压缩试验中岩石扩容现象的测试,分析了超声横波在不同岩石压缩过程中的传播情况。利用超声横波的特性测出岩石在压缩的不同阶段的微裂纹发展情况和体积变化情况,进一步证明了不同岩石在单轴压缩过程中扩容的时间和程度存在差异:超声横波在各岩样中到达最大速率的时间在灰岩中较晚;超声横波的传播速率在玄武岩中传播较快,灰岩中次之,在砂岩中最慢;超声横波在不同岩石中传播时速率的变化幅度以及压缩各阶段传播速率变化幅度受轴向应力应变的影响而有不同。
By the test about the volumetric dilatancy in rocks under the uniaxial compression with ultrasonic, the propagation of ultrasonic S-wave was analyzed in the compressing process of different rocks. With the characteristics of ultrasonic S-wave, the development of tiny cracks and the volume changes in rocks were measured under the different compressing period, which further proves that the volumetric strain have different time and degree in different rocks under the uniaxial compression. The results show that the time for ultrosonic S-wave reaching the maximum velocity is most late in calcareous rocks compared with the other rock samples ; The propagation velocity of ultrosonic S-wave is rapidest in basalt, less rapidest in calcareous rocks, and slowest in sandstone. The propagation velocity changing ranges of ultrosonic S-wave in different rocks and at each compression stage are varied under the influence of uniaxial stress strain.
出处
《西南科技大学学报》
CAS
2007年第1期39-42,共4页
Journal of Southwest University of Science and Technology
基金
地质灾害防治及地质环境保护国家专业实验室资助项目(编号:GZ2005)。
关键词
岩石扩容
微裂纹
体积应变
横波速率
the volumetric dilatancy in rocks, tiny cracke
the volumetric strain
the velocity of ultrasonic S-wave
