Affiliation:
1. Department of Civil Engineering, School of Civil & Resource Engineering University of Science & Technology Beijing Beijing China
2. Henan Key Laboratory for Green and Efficient Mining & Comprehensive Utilization of Mineral Resources Henan Polytechnic University Jiaozuo Henan China
Abstract
AbstractThis work aims to explore the impact of cyclic stress amplitude (CSA) on the macro‐meso failure characteristics of deeply buried rock under confining pressure unloading process. The experimental results show that the deterioration of rock structure is influenced by the disturbed stress amplitude. It is found that the lateral expansion induced by confining pressure unloading has a great impact on rock volumetric deformation, damage propagation, and failure characteristics. Additionally, a damage evolution model is proposed and expressed using the irreversible lateral strain. The model is available to express the progressive damage evolution pattern. Finally, CT images investigate the complexity of the crack network, and it decreases with increasing CSA. It is suggested that the final volumetric deformation does not simply depend on the stimulated crack pattern but also on the failure modes. A specimen with the pure shear failure mode has the largest volumetric deformation.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Beijing Municipality
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
11 articles.
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