Mechanical Behavior and Damage Modeling of Dolomite Under Drying–Wetting Cycles and Variable Lower Bound Cyclic Loading.
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| Title: | Mechanical Behavior and Damage Modeling of Dolomite Under Drying–Wetting Cycles and Variable Lower Bound Cyclic Loading. |
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| Authors: | Yang, Xinqi1 (AUTHOR), Li, Qihang1,2 (AUTHOR), Wang, Yunmin3 (AUTHOR), Li, Xiaoshuang1,4,5 (AUTHOR) xsli2011@cczu.edu.cn, Lu, Jun6 (AUTHOR), Xie, Yanhong7 (AUTHOR), YONGLIANG, HE (AUTHOR) hyl@tyust.edu.cn |
| Source: | Geofluids. 7/7/2026, Vol. 2026, p1-19. 19p. |
| Subject Terms: | *Dolomite, *Cyclic loads, *Strains & stresses (Mechanics), *Damage models, *Continuum damage mechanics, *Energy dissipation, *Rock slopes |
| Abstract: | To investigate the long‐term stability of open‐pit mine slopes under the coupled effects of seasonal rainfall‐induced drying–wetting (D‐W) cycles and mining‐related transportation machinery loads, variable lower limit cyclic loading tests were conducted under a confining pressure of 1 MPa on intact dolomite specimens subjected to 0, 1, 5, 10, and 30 D‐W cycles. The evolution of physical and mechanical properties, energy dissipation behavior, and failure modes was systematically investigated. Results show that water absorption increased significantly from 0.48% to 1.56% with an increasing number of D‐W cycles, whereas the peak strength gradually decreased. Specifically, peak strain increased markedly in the early stage and then tended to stabilize. As the lower stress limit increased, the peak strength exhibited a quadratic trend. Moreover, when the lower stress limit was ≤ 15 MPa, cyclic loading produced a strengthening effect, with the peak strength increasing by up to 10.2%. The dissipated energy density increased significantly with the number of D‐W cycles, and a damage constitutive model—derived primarily from theoretical analysis and refined through empirical correction—was established. Moreover, increasing the lower stress limit promoted a transition in the macroscopic failure mode from tensile to shear failure, which was further intensified by D‐W cycling. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Abstract: | To investigate the long‐term stability of open‐pit mine slopes under the coupled effects of seasonal rainfall‐induced drying–wetting (D‐W) cycles and mining‐related transportation machinery loads, variable lower limit cyclic loading tests were conducted under a confining pressure of 1 MPa on intact dolomite specimens subjected to 0, 1, 5, 10, and 30 D‐W cycles. The evolution of physical and mechanical properties, energy dissipation behavior, and failure modes was systematically investigated. Results show that water absorption increased significantly from 0.48% to 1.56% with an increasing number of D‐W cycles, whereas the peak strength gradually decreased. Specifically, peak strain increased markedly in the early stage and then tended to stabilize. As the lower stress limit increased, the peak strength exhibited a quadratic trend. Moreover, when the lower stress limit was ≤ 15 MPa, cyclic loading produced a strengthening effect, with the peak strength increasing by up to 10.2%. The dissipated energy density increased significantly with the number of D‐W cycles, and a damage constitutive model—derived primarily from theoretical analysis and refined through empirical correction—was established. Moreover, increasing the lower stress limit promoted a transition in the macroscopic failure mode from tensile to shear failure, which was further intensified by D‐W cycling. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 14688115 |
| DOI: | 10.1155/gfl/5592198 |
