ULTRASONIC TESTS ON SCHIST WITH SATURATED FRACTURES UNDER UNIAXIAL COMPRESSION
SONG Zhanping1，2，WANG Junxiang3，JIANG Annan3，LIU Xinrong1，4，ZHANG Xuegang1
(1. School of Civil Engineering，Xi?an University of Architecture and Technology，Xi?an，Shaanxi 710055，China；
2. China Railway Construction Bridge Engineering Bureau Group Co.，Ltd.，Tianjin 300308，China；
3. Institute of Road and Bridge Engineering，Dalian Maritime University，Dalian，Liaoning 116026，China；
4. School of Civil Engineering，Chongqing University，Chongqing 400030，China)
Abstract：In this study，the longitudinal wave velocities of schist specimens with saturated and dry fractures under loading and unloading conditions were measured，so that the variations and characteristics of wave velocity of saturated schist with fractures in the whole process of compression were obtained and relationship between wave velocity with the rock damage and failure were established. The wave velocities of the saturated specimen without loading were found to be significantly higher than those of dry specimen. The wave velocities parallel to cracks increased from 0.928% to 15.357% upon saturation，and the wave velocities perpendicular to cracks increased from 20.042% to 113.362% upon saturation. The wave velocities perpendicular to cracks were affected more evidently than those parallel to cracks. Under compression，the acoustic wave velocities perpendicular to cracks for both the schist specimens with the dry and saturated fractures were nonlinear in the elastic stage or the compression process and dropped drastically at the point of peak stress indicating the cracks were developed. While for dry specimens，the wave velocities parallel to cracks were reduced suddenly only at the peak point. For the saturated specimens，the wave velocities parallel to cracks undulated.
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2014, Vol. 33 
