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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.
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]
Copyright of Rock Mechanics & Rock Engineering is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
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  Data: Numerical Simulation and Parametric Analysis of Ultrasonic Velocity Test in Fractured Rock Based on the Discrete Element Method.
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  Data: <searchLink fieldCode="JN" term="%22Rock+Mechanics+%26+Rock+Engineering%22">Rock Mechanics & Rock Engineering</searchLink>. Oct2024, Vol. 57 Issue 10, p8563-8579. 17p.
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  Data: <searchLink fieldCode="DE" term="%22Ultrasonic+testing%22">Ultrasonic testing</searchLink><br /><searchLink fieldCode="DE" term="%22Ultrasonic+wave+attenuation%22">Ultrasonic wave attenuation</searchLink><br /><searchLink fieldCode="DE" term="%22Discrete+element+method%22">Discrete element method</searchLink><br /><searchLink fieldCode="DE" term="%22Geometric+distribution%22">Geometric distribution</searchLink><br /><searchLink fieldCode="DE" term="%22Ultrasonic+waves%22">Ultrasonic waves</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: 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]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Rock Mechanics & Rock Engineering is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Text: English
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      – SubjectFull: Geometric distribution
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      – TitleFull: Numerical Simulation and Parametric Analysis of Ultrasonic Velocity Test in Fractured Rock Based on the Discrete Element Method.
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              Text: Oct2024
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