Abstract：Taking granite as the research subject，a uniaxial cyclic loading and unloading test scheme based on axial strain control is proposed to investigate the strength and deformation evolution of rock samples under cyclic loading. The uniaxial compression test reveals significant variability in peak strength and Poisson?s ratio，while peak strain and elastic modulus remain relatively stable，at 0.43% and 0.37%，respectively. The stress-strain curve was analyzed and fitted in segments，with the axial strain control values determined through slope analysis，yielding 0.37% and 0.32%. During cyclic loading and unloading，as the number of cycles increases，the stress-strain curve forms a hysteresis loop that evolves in the direction of increased strain. The difference in elastic modulus between the first loading and unloading cycle is the largest；thereafter，this difference gradually decreases，both trends demonstrating a nonlinear downward trajectory，while Poisson?s ratio exhibits a nonlinear upward trend. The cyclic loading-unloading response ratio serves as an indicator of the degree of damage to the rock sample，which continues to increase. In the case of uniaxial compression failure of damaged rocks，there are more primary fracture surfaces compared to conventional rocks，and with the increase in the number of cycles，peak strength displays a nonlinear accelerating downward trend. The elastic modulus shows a linear downward trend，while Poisson?s ratio exhibits a nonlinear decelerating upward trend.
魏旭雅，陈 祥，邵铭浚，雷顺宇. 基于应变控制的单轴循环加卸载下花岗岩变形破坏研究[J]. 岩石力学与工程学报, 2025, 44(S1): 113-123.
WEI Xuya，CHEN Xiang，SHAO Mingjun，LEI Shunyu. Study on deformation of granite under uniaxial cyclic loading and unloading based on strain control. , 2025, 44(S1): 113-123.
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2025, Vol. 44 
