A Chemical Damage Creep Model of Rock Considering the Influence of Triaxial Stress

Youliang Chen; Qijian Chen; Yungui Pan; Peng Xiao; Xi Du; Suran Wang; Ning Zhang; Xiaojian Wu

doi:10.3390/ma15217590

Materials (Oct 2022)

A Chemical Damage Creep Model of Rock Considering the Influence of Triaxial Stress

Youliang Chen,
Qijian Chen,
Yungui Pan,
Peng Xiao,
Xi Du,
Suran Wang,
Ning Zhang,
Xiaojian Wu

Affiliations

Youliang Chen: Department of Civil Engineering, School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Qijian Chen: Department of Civil Engineering, School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Yungui Pan: Department of Civil Engineering, School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Peng Xiao: School of Transportation, Southeast University, Nanjing 210096, China
Xi Du: Department of Civil Engineering, School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Suran Wang: Department of Civil Engineering, School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Ning Zhang: Department of Civil Engineering, School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Xiaojian Wu: Shanghai Construction Engineering Group Engineering Research Institute, Shanghai 200093, China

DOI: https://doi.org/10.3390/ma15217590
Journal volume & issue: Vol. 15, no. 21
p. 7590

Abstract

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In order to accurately describe the characteristics of each stage of rock creep behavior under the combined action of acid environment and true triaxial stress, based on damage mechanics, chemical damage is connected with elastic modulus; thus, the damage relations considering creep stress damage and chemical damage are obtained. The elastic body, nonlinear Kelvin body, linear Kelvin body, and viscoelastic–plastic body (Mogi–Coulomb) are connected in series, and the actual situation under the action of true triaxial stress is considered at the same time. Therefore, a damage creep constitutive model considering the coupling of rock acid corrosion and true triaxial stress is established. The parameters of the deduced model are identified and verified with the existing experimental research results. The yield surface equation of rock under true triaxial stress is obtained by data fitting, and the influence of intermediate principal stress on the creep model is discussed. The derived constitutive model can accurately describe the characteristics of each stage of true triaxial creep behavior of rock under acid environment.

Published in Materials

ISSN: 1996-1944 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering; Technology: Engineering (General). Civil engineering (General); Science: Natural history (General): Microscopy; Science: Physics: Descriptive and experimental mechanics
Website: http://www.mdpi.com/journal/materials/

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