Failure mechanisms of sandstone subjected to cyclic loading considering stress amplitude effects

作者：Qican Ran, Yunpei Liang, Quanle Zou, Zihan Chen, Jinfei Zhan, Liang Chen, Zhaopeng Wu, Tengfei Ma · 发表于：International Journal of Coal Science & Technology · 年份：2025 · DOI：10.1007/s40789-025-00802-4 · 被引用次数：32 · 研究领域：Rock Mechanics and Modeling、Drilling and Well Engineering、Geotechnical Engineering and Underground Structures

Abstract In underground engineering fields, such as mining engineering, rocks are often subjected to cyclic loading, resulting in the deterioration of their mechanical properties, which poses a serious threat to engineering construction. Thus, investigating the mechanical response of rocks under cyclic loading is meaningful. Cyclic loading experiments were conducted on sandstone samples with different cyclic stress amplitudes (CSAs). First, the deformation characteristics and strain energy evolution were analyzed. The internal fracture extension and fragmentation characteristics of sandstone after failure were subsequently analyzed. Finally, the failure mechanism of sandstone was investigated. The results revealed that deformation, failure mode, and particle fragmentation characteristics were affected by the CSA, with the peak strain being greatest in sandstone samples subjected to the greatest CSA. With increasing CSA, the load‒unload response ratio of sandstone under the last cyclic stage generally tends to increase. Furthermore, there was an increasing trend in the dissipated energy percentage of sandstone as the CSA increased, which was a result of the increased energy used to drive fracture extension. Moreover, the sandstone exhibited a tensile‒shear composite failure mode dominated by shear failure. Nevertheless, with increasing CSA, the shear failure surface became more obvious. In addition, the proportion of small blocks and the fragmentation fractal dimension increas...