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

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

Materials (Basel). 2022 Oct 28;15(21):7590. doi: 10.3390/ma15217590.

Authors

Youliang Chen^{1

2}, Qijian Chen¹, Yungui Pan¹, Peng Xiao³, Xi Du^{1

4}, Suran Wang¹, Ning Zhang¹, Xiaojian Wu⁵

Affiliations

¹ Department of Civil Engineering, School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China.
² Department of Engineering Geology and Hydrogeology, RWTH Aachen University, 52064 Aachen, Germany.
³ School of Transportation, Southeast University, Nanjing 210096, China.
⁴ School of Civil and Environmental Engineering, University of New South Wales, Sydney 2052, Australia.
⁵ Shanghai Construction Engineering Group Engineering Research Institute, Shanghai 200093, China.

Abstract

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.

Keywords: chemical corrosion; intermediate principal stress; nonlinearity; rock creep constitutive; true triaxial stress.

Grants and funding

This research was funded by “The high-level foreign experts project” (22WZ2503000), Science and Technology Commission of Shanghai Municipality (STCSM);“The professional degree postgraduate practice base project” (Civil and Hydraulic Engineering, 2022) USST; “Uncertainty analysis of performance of masonry members based on microscopic and fine-scale near-field dynamics simulations”, grant number 51978401; “National Natural Science Foundation of China”, grant number 42107168.