University of Oulu

Zong-Xian Zhang, De-Feng Hou, Adeyemi Aladejare, Empirical equations between characteristic impedance and mechanical properties of rocks, Journal of Rock Mechanics and Geotechnical Engineering, Volume 12, Issue 5, 2020, Pages 975-983, ISSN 1674-7755,

Empirical equations between characteristic impedance and mechanical properties of rocks

Saved in:
Author: Zhang, Zong-Xian1; Hou, De-Feng1,2; Aladejare, Adeyemi1
Organizations: 1Oulu Mining School, University of Oulu, Oulu, 90014, Finland
2College of Resources and Safety Engineering, China University of Mining and Technology, Beijing, 100083, China
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.5 MB)
Persistent link:
Language: English
Published: Elsevier, 2020
Publish Date: 2021-02-10


Based on a great number of experimental data on various mechanical properties of rock in the literature, six empirical equations between the characteristic impedance (product of density and P-wave velocity) and mechanical properties of rock are proposed. These properties include uniaxial compressive strength, tensile strength, shear strength, mode I fracture toughness, Young's modulus, and Poisson's ratio. These empirical equations show that the values of the aforementioned properties increase with increase in characteristic impedance. It also implies that the characteristic impedance of rock may be considered as an index to represent the main properties of rock. In this sense, it is possible to consider using characteristic impedance to classify rock masses for studies in the future.

see all

Series: Journal of rock mechanics and geotechnical engineering
ISSN: 1674-7755
ISSN-L: 1674-7755
Volume: 12
Issue: 5
Pages: 975 - 983
DOI: 10.1016/j.jrmge.2020.05.006
Type of Publication: A1 Journal article – refereed
Field of Science: 1171 Geosciences
Funding: This study was carried out in the University of Oulu. The support from China Scholarship Council (CSC) (Grant No. 201706430058) to the second author is acknowledged.
Copyright information: © 2020 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V. This is an open access article under theCCBY-NC-ND license (