Statistical damage constitutive model for rocks subjected to cyclic stress and cyclic temperature

Acta Geophysica - Tập 65 Số 5 - Trang 893-906 - 2017
Zhou, Shu-Wei1,2, Xia, Cai-Chu1,3, Zhao, Hai-Bin4, Mei, Song-Hua4, Zhou, Yu1
1Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai, People’s Republic of China
2Institute of Structural Mechanics, Bauhaus University Weimar, Weimar, Germany
3College of Civil Engineering, Shaoxing University, Shaoxing, People’s Republic of China
4Hunan Key Laboratory of Key Technology on Hydropower Development, Power China Zhongnan Engineering Corporation Limited, Changsha, People’s Republic of China

Tóm tắt

A constitutive model of rocks subjected to cyclic stress–temperature was proposed. Based on statistical damage theory, the damage constitutive model with Weibull distribution was extended. Influence of model parameters on the stress–strain curve for rock reloading after stress–temperature cycling was then discussed. The proposed model was initially validated by rock tests for cyclic stress–temperature and only cyclic stress. Finally, the total damage evolution induced by stress–temperature cycling and reloading after cycling was explored and discussed. The proposed constitutive model is reasonable and applicable, describing well the stress–strain relationship during stress–temperature cycles and providing a good fit to the test results. Elastic modulus in the reference state and the damage induced by cycling affect the shape of reloading stress–strain curve. Total damage induced by cycling and reloading after cycling exhibits three stages: initial slow increase, mid-term accelerated increase, and final slow increase.

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Acta Geophysica

Tập 65 Số 5

893-906

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