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|Title:||Deterioration and strain energy development of sandstones under quasi-static and dynamic loading after freeze-thaw cycles|
|Citation:||Cold Regions Science and Technology, 2019; 160:252-264|
|Jian Zhang, Hongwei Deng, Abbas Taheri, Bo Ke, Chuanju Liu|
|Abstract:||Rocks in cold regions are often exposed to extreme temperature change, and different loading conditions, therefore, will be subjected to deterioration. In this study, the deterioration of sandstone after freeze-thaw (F-T) cycles under quasi-static and dynamic loading conditions is investigated. In doing so, physical and mechanical properties of sandstone samples were studied after 20, 60, 100 and 140 F-T cycles. An increase in porosity and decrease in P wave velocity demonstrated a degradation in physical properties after F-T cycles. In addition, peak strengths of specimens were observed to be higher in the dynamic loading conditions as compared with the quasi-static conditions; while Young's modulus almost remained constant. Furthermore, a decay model was used to predict the deterioration of sandstone under different loading conditions and F-T cycles. Finally, the effects of F-T cycles on a brittleness and strain energy development were investigated. It was observed that rock became more brittle in the pre-peak regime after F-T cycles. It also demonstrated strain energies including the pre-peak, the peak, the post-peak and the total strain energies decrease after F-T cycles while variations of elastic strain energy with F-T cycles doesn't show any conclusive trend. Correlations between porosity and strain energies implied that porosity is a key factor in strain energy development for this kind of sandstone except that of elastic strain energy.|
|Keywords:||Quasi-static loading; dynamic loading; freeze-thaw cycles; sandstone; porosity; strain energy|
|Rights:||© 2019 Published by Elsevier B.V.|
|Appears in Collections:||Civil and Environmental Engineering publications|
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