| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4743906 | Engineering Geology | 2012 | 7 Pages |
As waves cross rock joints, the wave velocity is difficult to determine due to joint irregular surfaces. In this paper, a new RGB (red, green and blue) color model is established, and by applying this model, a new calculation method of the image fractal dimension (IFD) of joint surfaces is proposed. Based on this new calculation method, the relationship between P wave velocity and the image fractal dimension of joint surfaces is obtained, and the velocity of P waves across joints is formulated. The ultrasonic tests for rock specimens with a single joint are conducted to confirm the new formula of the velocity of P waves across joints. The test results agree well with the analytical solution presented in this paper. The results show that the velocity of P waves across joints decreases with the increase of joint surface roughness.
► A new RGB color model was established. ► A calculation method of the image fractal dimension of joint surfaces was proposed. ► A new formula of the velocity of P waves across joints was derived. ► Ultrasonic tests were conducted to confirm the new formula of P wave velocity.
