Numerical Simulation and Parametric Analysis of Ultrasonic Velocity Test in Fractured Rock Based on the Discrete Element Method.
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| Title: | Numerical Simulation and Parametric Analysis of Ultrasonic Velocity Test in Fractured Rock Based on the Discrete Element Method. |
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| Authors: | Chen, Shujie1 (AUTHOR), Zhu, Zhengguo1,2,3 (AUTHOR) zzg@stdu.edu.cn, Zhao, Yong4 (AUTHOR), Gu, Guangyan1 (AUTHOR), Ma, Chaoyi1 (AUTHOR), Wang, Cong1 (AUTHOR) |
| Source: | Rock Mechanics & Rock Engineering. Oct2024, Vol. 57 Issue 10, p8563-8579. 17p. |
| Subjects: | Ultrasonic testing, Ultrasonic wave attenuation, Discrete element method, Geometric distribution, Ultrasonic waves |
| Abstract: | Ultrasonic pulse velocity (UPV) test is widely used to evaluate rock mass integrity. However, it is rather difficult to conduct a sampling of fractured rocks and acquire a set of rocks with different fracture levels in experiments due to friability and heterogeneity. Consequently, numerical modeling on the UPV test of multi-fractured rock is carried out based on the discrete element method (DEM). A single fracture model and comparison between 2D and 3D models are first carried out for numerical verification. Subsequently, the UPV tests of multi-fractured rock are numerically investigated. The fracture system follows a power-law length distribution and is randomly allocated for fracture position and orientation. The influences of geometric fracture characteristics and related mechanical parameters on the wave velocity are discussed. Finally, a multi-parameter sensitivity analysis is performed. It is found that the 2D and 3D models of the UPV test have almost similar variation regularity at different fracture configuration conditions. Long fractures significantly influence the reduction of wave velocity in rock interior. The fracture intensity, long fracture proportion, and wave velocity value are linearly related. In contrast, the mechanical parameters including fracture stiffness and elastic modulus have a limited influence on the attenuation of ultrasonic waves especially at high stiffness and modulus range, and the power function model could fit the correlation between wave velocity and mechanical parameters. An inversion approach is proposed for estimating the fracture magnitude by adjusting the fracture intensity and long fracture ratio to match the target wave velocity value. Highlights: Ultrasonic wave velocity testing results for 2D and 3D fractured rock models were compared. Impacts of fracture geometric distribution characteristics and mechanical parameters on wave velocity were investigated. A fracture distribution inversion strategy based on wave velocity test is proposed as the future perspective based on the parameter sensitivity analysis. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | Ultrasonic pulse velocity (UPV) test is widely used to evaluate rock mass integrity. However, it is rather difficult to conduct a sampling of fractured rocks and acquire a set of rocks with different fracture levels in experiments due to friability and heterogeneity. Consequently, numerical modeling on the UPV test of multi-fractured rock is carried out based on the discrete element method (DEM). A single fracture model and comparison between 2D and 3D models are first carried out for numerical verification. Subsequently, the UPV tests of multi-fractured rock are numerically investigated. The fracture system follows a power-law length distribution and is randomly allocated for fracture position and orientation. The influences of geometric fracture characteristics and related mechanical parameters on the wave velocity are discussed. Finally, a multi-parameter sensitivity analysis is performed. It is found that the 2D and 3D models of the UPV test have almost similar variation regularity at different fracture configuration conditions. Long fractures significantly influence the reduction of wave velocity in rock interior. The fracture intensity, long fracture proportion, and wave velocity value are linearly related. In contrast, the mechanical parameters including fracture stiffness and elastic modulus have a limited influence on the attenuation of ultrasonic waves especially at high stiffness and modulus range, and the power function model could fit the correlation between wave velocity and mechanical parameters. An inversion approach is proposed for estimating the fracture magnitude by adjusting the fracture intensity and long fracture ratio to match the target wave velocity value. Highlights: Ultrasonic wave velocity testing results for 2D and 3D fractured rock models were compared. Impacts of fracture geometric distribution characteristics and mechanical parameters on wave velocity were investigated. A fracture distribution inversion strategy based on wave velocity test is proposed as the future perspective based on the parameter sensitivity analysis. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 07232632 |
| DOI: | 10.1007/s00603-024-03944-0 |
