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| Conversion method from ultrasonic to seismic velocity based on rock integrity assessment |
| ZHANG Chengyuan1，WAN Wenkai1，2，WANG Shuang2，3，SUN Xinlei3，LIU Quansheng1，4，5 |
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Science，Beijing 100049，China；3. State Key Laboratory of Isotope Geochemistry，Guangzhou Institute of Geochemistry，Chinese Academy of Sciences，Guangzhou，Guangdong 510640，China；4. School of Civil Engineering and Architecture，Wuhan University，Wuhan，Hubei 430072，China；5. Key Laboratory of Geotechnical and Structural Safety Engineering of Hubei Province，Wuhan University，Wuhan，Hubei 430072，China)
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Abstract A method for transforming the ultrasonic velocity of the drilling core to the seismic velocity of the corresponding strata beneath the surface was proposed. According to the rock type，the ultrasonic velocity of rock blocks is converted to the seismic wave velocity using different conversion coefficients，and the velocity is modified using an empirical equation，considering the effects of water saturation，temperature and pressure. The seismic wave velocity of rock body is obtained from the seismic wave velocity of a rock block，by using the integrity coefficient Kv of rock mass and the volume joint number Jv of rock body. To testify this method，5 drilling cores were chosen from the polymetallic deposit in Huayangchuan，and the ultrasonic velocities of the samples were measured and converted into the seismic velocities according to the method. Comparisons indicate that the two sets of velocities are very well correlated in terms of the depth change.
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2018, Vol. 37 
