Characterisation of Energy Evolution in Freeze-thawed Sandstone under Cyclic Loading and Unloading

DOI

10.2991/978-94-6463-415-0_62How to use a DOI?

Keywords

Freeze-thaw Cycle; Cyclic Loading and Unloading; Energy Evolution

Abstract

In order to study the energy evolution law of rock under the combined action of freeze-thaw cycle and loading and unloading, the freeze-thaw cycle and graded cyclic loading and unloading tests were carried out on coarse-grained sandstone, and the mechanical properties and energy evolution characteristics of sandstone with different freeze-thaw cycles under cyclic loading were analyzed. The results showed that the peak strength of sandstone under cyclic loading decreased from 16.5 MPa at 0 times of freezing and thawing to 5.9 MPa at 30 times of freezing and thawing, which was negatively correlated with the number of times of freezing and thawing in a linear relationship. The freeze-thaw cycles promoted the deformation, and the maximum strain increased from 1.43% to 2.60%, which enhanced the ductility of the sandstone. The total and dissipated energy densities showed a U-shaped change under loading and unloading at each stress level, and the elastic energy density showed a horizontal stepwise increase, and the elastic energy was accelerated to be released before the destruction of the rock. The cumulative elasticity, dissipated energy density and cumulative total energy density of sandstones with different numbers of freezing and thawing were all linearly related, and the fit R² was greater than 0.99. The energy storage coefficient decreased from 0.68 at 0 times of freezing and thawing to 0.57 at 30 times of freezing and thawing, and the energy consumption coefficient increased from 0.32 to 0.43. The energy storage level of the sandstone decreased with the increase in the number of freezing and thawing cycles, whereas the energy consumption level was positively correlated with the number of freezing and thawing cycles.

Copyright

© 2024 The Author(s)

Open Access

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TY  - CONF
AU  - Dongyang Han
AU  - Yongjun Song
AU  - Shuanglong Wang
PY  - 2024
DA  - 2024/05/14
TI  - Characterisation of Energy Evolution in Freeze-thawed Sandstone under Cyclic Loading and Unloading
BT  - Proceedings of the 2023 9th International Conference on Advances in Energy Resources and Environment Engineering (ICAESEE 2023)
PB  - Atlantis Press
SP  - 585
EP  - 594
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-415-0_62
DO  - 10.2991/978-94-6463-415-0_62
ID  - Han2024
ER  -