Yang Rongzhou, Xu Ying
Anhui Key Laboratory of Mining Construction Engineering, Anhui University of Science and Technology, Huainan 232001, China.
School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China.
iScience. 2024 Dec 12;28(1):111583. doi: 10.1016/j.isci.2024.111583. eCollection 2025 Jan 17.
The diversion tunnel is frequently subjected to cyclic dynamic loads during blasting and mechanical excavation. To explore the theory and mechanism of cyclic dynamic mechanical damage for granite in a diversion tunnel under cyclic loading-unloading, the incremental cyclic loading-unloading test and numerical simulation were conducted on granite samples from the diversion tunnel. According to the mechanical and deformation characteristics of rock samples in the process of cyclic loading-unloading, the stress-strain normalization theory evolution model based on viscoelastoplasticity was established, and the cyclic dynamic damage evolution mechanism of rock samples was revealed. The evolution characteristics of stress-strain curves of rock samples under cyclic loading-unloading were effectively described, and the loading-unloading two-stage constitutive equation of rock samples under cyclic loading-unloading was established. The energy and damage evolution mechanism of the final full stress-strain curve and the influence mechanism of shrinkage and expansion of rock particles on the mechanical properties of granite were discussed.
导流洞在爆破和机械开挖过程中经常受到循环动荷载作用。为了探究循环加卸载作用下导流洞花岗岩的循环动力力学损伤理论与机制，对取自导流洞的花岗岩试样进行了增量循环加卸载试验及数值模拟。根据岩石试样在循环加卸载过程中的力学及变形特性，建立了基于粘弹塑性的应力-应变归一化理论演化模型，揭示了岩石试样的循环动力损伤演化机制。有效描述了岩石试样在循环加卸载下应力-应变曲线的演化特征，建立了岩石试样在循环加卸载下的加卸载两阶段本构方程。探讨了最终全应力-应变曲线的能量与损伤演化机制以及岩石颗粒胀缩对花岗岩力学性能的影响机制。
