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Strain energy evolution characteristics and mechanisms of hard rocks under true triaxial compression
https://orcid.org/0000-0003-4297-5810
Abstract The energy evolution processes and mechanisms between three hard rocks are studied using a strain energy analysis method under true triaxial compression (TTC). Using Beishan granite as an example, the change in the energy storage limit U max e, strain energy ratio and strain energy conversion rate for different σ 2 and σ 3 values is investigated. The research results indicate that within the scope of this study, the energy evolution processes and characteristics are largely similar at pre-peak, and notably different at post-peak. The energy storage limit U max e of the Beishan granite indicates an approximately slow increase with an increasing σ 2, whereas its mean value shows a favorably linear increase with an increasing σ 3. The elastic strain energy ratio shows a reverse relationship with that of the dissipated strain energy during rock failure. For an increasing σ 2, the conversion rates of the total elastic strain energy U e and the total dissipated strain energy U d of the Beishan granite demonstrate a poor relationship at both pre- and post-peak. For an increasing σ 3, the mean values indicate a favorable linear change at both pre- and post-peak. The total strain energy and total elastic energy of the different hard rocks increase with increasing σ 2 or σ 3 values at pre-peak, whereas the total dissipated strain energy increases with an increasing σ 3 and decreases with an increasing σ 2 at pre-peak. When the external conditions are not considered, the difference in the elastic and plastic deformation capacities, which influence the energy difference in different rocks, is influenced by the mineral compositions and microstructures of the different rocks.
Highlights The strain energy evolution process and difference of three hard rocks are studied under true triaxial compression. The change of energy storage limit U max e, strain energy ratio and strain energy conversion rate with different σ 2 and σ 3 are investigated. The energy evolution mechanism under different σ 2 and σ 3 levels and the energy difference of different hard rocks are analyzed
Strain energy evolution characteristics and mechanisms of hard rocks under true triaxial compression
https://orcid.org/0000-0003-4297-5810
Abstract The energy evolution processes and mechanisms between three hard rocks are studied using a strain energy analysis method under true triaxial compression (TTC). Using Beishan granite as an example, the change in the energy storage limit U max e, strain energy ratio and strain energy conversion rate for different σ 2 and σ 3 values is investigated. The research results indicate that within the scope of this study, the energy evolution processes and characteristics are largely similar at pre-peak, and notably different at post-peak. The energy storage limit U max e of the Beishan granite indicates an approximately slow increase with an increasing σ 2, whereas its mean value shows a favorably linear increase with an increasing σ 3. The elastic strain energy ratio shows a reverse relationship with that of the dissipated strain energy during rock failure. For an increasing σ 2, the conversion rates of the total elastic strain energy U e and the total dissipated strain energy U d of the Beishan granite demonstrate a poor relationship at both pre- and post-peak. For an increasing σ 3, the mean values indicate a favorable linear change at both pre- and post-peak. The total strain energy and total elastic energy of the different hard rocks increase with increasing σ 2 or σ 3 values at pre-peak, whereas the total dissipated strain energy increases with an increasing σ 3 and decreases with an increasing σ 2 at pre-peak. When the external conditions are not considered, the difference in the elastic and plastic deformation capacities, which influence the energy difference in different rocks, is influenced by the mineral compositions and microstructures of the different rocks.
Highlights The strain energy evolution process and difference of three hard rocks are studied under true triaxial compression. The change of energy storage limit U max e, strain energy ratio and strain energy conversion rate with different σ 2 and σ 3 are investigated. The energy evolution mechanism under different σ 2 and σ 3 levels and the energy difference of different hard rocks are analyzed
Strain energy evolution characteristics and mechanisms of hard rocks under true triaxial compression
https://orcid.org/0000-0003-4297-5810
Abstract The energy evolution processes and mechanisms between three hard rocks are studied using a strain energy analysis method under true triaxial compression (TTC). Using Beishan granite as an example, the change in the energy storage limit U max e, strain energy ratio and strain energy conversion rate for different σ 2 and σ 3 values is investigated. The research results indicate that within the scope of this study, the energy evolution processes and characteristics are largely similar at pre-peak, and notably different at post-peak. The energy storage limit U max e of the Beishan granite indicates an approximately slow increase with an increasing σ 2, whereas its mean value shows a favorably linear increase with an increasing σ 3. The elastic strain energy ratio shows a reverse relationship with that of the dissipated strain energy during rock failure. For an increasing σ 2, the conversion rates of the total elastic strain energy U e and the total dissipated strain energy U d of the Beishan granite demonstrate a poor relationship at both pre- and post-peak. For an increasing σ 3, the mean values indicate a favorable linear change at both pre- and post-peak. The total strain energy and total elastic energy of the different hard rocks increase with increasing σ 2 or σ 3 values at pre-peak, whereas the total dissipated strain energy increases with an increasing σ 3 and decreases with an increasing σ 2 at pre-peak. When the external conditions are not considered, the difference in the elastic and plastic deformation capacities, which influence the energy difference in different rocks, is influenced by the mineral compositions and microstructures of the different rocks.
Highlights The strain energy evolution process and difference of three hard rocks are studied under true triaxial compression. The change of energy storage limit U max e, strain energy ratio and strain energy conversion rate with different σ 2 and σ 3 are investigated. The energy evolution mechanism under different σ 2 and σ 3 levels and the energy difference of different hard rocks are analyzed
Strain energy evolution characteristics and mechanisms of hard rocks under true triaxial compression
Zhang, Yan (author) / Feng, Xia-Ting (author) / Zhang, Xiwei (author) / Wang, Zhaofeng (author) / Sharifzadeh, Mostafa (author) / Yang, Chengxiang (author) / Kong, Rui (author) / Zhao, Jun (author)
Engineering Geology ; 260
2019-07-03
Article (Journal)
Electronic Resource
English
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