|
|
|
| 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.
|
|
Received: 01 July 2014
|
|
|
|
| [1] 汤连生，周翠英. 渗透与水化学作用之受力岩体的破坏机理[J]. 中山大学学报，1996，35(6)：95–100.(TANG Liansheng，ZHOU Cuiying. Analysis of mechanism of permeation and hydrochemical action resulting in failure of loaded rock mass[J]. Acta Scientiarum Naturalium Universitatis Sunyatseni，1996，35(6)：95–100.(in Chinese))
[2] 周翠英，邓毅梅，谭祥韶，等. 饱水软岩力学性质软化的试验研究与应用[J]. 岩石力学与工程学报，2005，24(1)：33–38.(ZHOU Cuiying，DENG Yimei，TAN Xiangshao，et al. Experimental research on the softening of mechanical properties of saturated soft rocks and application[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(1)：33–38.(in Chinese))
[3] 赵明阶. 受载岩石混凝土的声学特性及其应用[M]. 北京：科学出版社，2009：3–5.(ZHAO Mingjie. The acoustic characteristics and its application of the loaded rock and concrete[M]. Beijing：Science Press，2009：3–5.(in Chinese))
[4] RICHARD E T，THOMAS R B，ROBET C S. Velocity anisotropy in dry and saturated rock spheres and its relation to rock fabric[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1973，10(6)：535–557.
[5] AMOS N. Effects of stress on velocity anisotropy in rock with cracks[J]. Journal of Geophysical Research，1971，76(8)：2 022–2 034.
[6] 邓 涛，韩文峰，保翰璋. 饱水大理岩的波速变化特性研究[J]. 岩石力学与工程学报，2000，19(6)：726–765.(DENG Tao，HAN Wenfeng，BAO Hanzhang. On the characteristics of wave velocity variations for marbles saturated in water[J]. Chinese Journal of Rock Mechanics and Engineering，2000，19(6)：726–765.(in Chinese))
[7] 邓 涛，杨林德. 各向异性岩石纵、横波的波速比特性研究[J]. 岩石力学与工程学报，2006，25(10)：2 023–2 029.(DENG Tao，YANG Linde. Characteristics of velocity ratio of P-wave and S-wave for anisotropic rocks[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(10)：2 023–2 029.(in Chinese))
[8] 王大兴，辛可峰，李幼铭，等. 地层条件下砂岩含水饱和度对波速及衰减影响的实验研究[J]. 地球物理学报，2006，49(3)：908–914. (WANG Daxing，XIN Kefeng，LI Youming，et al. An experimental study of influence of water saturation on velocity and attention in sandstone under stratum conditions[J]. Chinese Journal of Geophysics，2006，49(3)：908–914.(in Chinese))
[9] 赵明阶，徐 蓉. 岩石损伤特性与强度的超声波速研究[J]. 岩土工程学报，2000，22(6)：720–722.(ZHAO Mingjie，XU Rong. The rock damage and strength study based on ultrasonic velocity[J]. Chinese Journal of Geotechnical Engineering，2000，22(6)：720–722.(in Chinese))
[10] 李 刚，陈正汉，谢 云，等. 超声波三轴压缩试验机及其应用[J]. 岩土工程学报，2007，29(5)：657–663.(LI Gang，CHEN Zhenghan，XIE Yun，et al. New triaxial test equipment combined with ultrasonic apparatus and its application[J]. Chinese Journal of Geotechnical Engineering，2007，29(5)：657–663.(in Chinese))
[11] 郑贵平，赵兴东，刘健坡，等. 岩石加载过程声波波速变化规律试验研究[J]. 东北大学学报：自然科学版，2009，30(8)：1 197–1 200. (ZHENG Guiping，ZHAO Xingdong，LIU Jianpo，et al. Experimental study on change in acoustic wave velocity when rock is loading[J]. Journal of Northeastern University：Natural Science，2009，30(8)： 1 197–1 200.(in Chinese))
[12] 赵 奎，金解放，王晓军，等. 岩石声速与其损伤及声发射关系研究[J]. 岩土力学，2007，28(10)：2 105–2 114.(ZHAO Kui，JIN Jiefang，WANG Xiaojun，et al. Study on rock damage and acoustic emission based on ultrasonic velocity test of rock specimen under uniaxial compression[J]. Rock and Soil Mechanics，2007，28(10)： 2 105–2 114.(in Chinese))
[13] 樊秀峰，简文彬. 砂岩疲劳特性的超声波速试验研究[J]. 岩石力学与工程学报，2008，27(3)：557–563.(FAN Xiufeng，JIAN Wenbin. Experimental research on fatigue characteristics of sandstone using ultrasonic wave velocity method[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(3)：557–563.(in Chinese)) |
|
|
|
2014, Vol. 33 
