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Mechanism and Effect of Stress Level on the Generalized Relaxation Behavior of Tage Tuff Under Triaxial Compression
Abstract The time-dependent rheological deformation of rocks has significance in the stability of rock structures. The study of time-dependent rock behaviors is commonly conducted with creep or relaxation rheology tests in laboratories. In this study, generalized relaxation behavior, which indicates the strain and stress change simultaneously with time during rheology, is investigated to extend the aspects of the time dependency of rock. The definition and mechanism of generalized relaxation are explained with simple models. Then, triaxial generalized relaxation tests were performed under different stress levels. The results show that the evolution curves of strain and stress with time show similar tendencies with conventional creep or relaxation during generalized relaxation and can be described using a power function. As the stress level increases, the initial damage to the rock increases; moreover, variations in strain and stress and their rates increase, which are explained by crack propagation. Finally, the complete generalized relaxation curves are discussed and compared with the complete creep and relaxation curves. This study is significant for understanding the time-dependent behaviors of rock and stability analysis of underground rock structures.
Highlights The definition and mechanism of generalized relaxation are explained with simple models.The effect of stress level on generalized relaxation behavior of Tage tuff is studied under triaxial compression.The evolution curves of generalized relaxation show similar tendencies to creep and relaxation.The complete curves of generalized relaxation are obtained and three stages are divided.
Mechanism and Effect of Stress Level on the Generalized Relaxation Behavior of Tage Tuff Under Triaxial Compression
Abstract The time-dependent rheological deformation of rocks has significance in the stability of rock structures. The study of time-dependent rock behaviors is commonly conducted with creep or relaxation rheology tests in laboratories. In this study, generalized relaxation behavior, which indicates the strain and stress change simultaneously with time during rheology, is investigated to extend the aspects of the time dependency of rock. The definition and mechanism of generalized relaxation are explained with simple models. Then, triaxial generalized relaxation tests were performed under different stress levels. The results show that the evolution curves of strain and stress with time show similar tendencies with conventional creep or relaxation during generalized relaxation and can be described using a power function. As the stress level increases, the initial damage to the rock increases; moreover, variations in strain and stress and their rates increase, which are explained by crack propagation. Finally, the complete generalized relaxation curves are discussed and compared with the complete creep and relaxation curves. This study is significant for understanding the time-dependent behaviors of rock and stability analysis of underground rock structures.
Highlights The definition and mechanism of generalized relaxation are explained with simple models.The effect of stress level on generalized relaxation behavior of Tage tuff is studied under triaxial compression.The evolution curves of generalized relaxation show similar tendencies to creep and relaxation.The complete curves of generalized relaxation are obtained and three stages are divided.
Mechanism and Effect of Stress Level on the Generalized Relaxation Behavior of Tage Tuff Under Triaxial Compression
Tang, Yang (author) / Zhang, Hailong (author) / Xu, Jiang (author) / Liu, Xinrong (author) / Okubo, Seisuke (author) / Peng, Shoujian (author) / Guo, Xiaoxiao (author)
2023
Article (Journal)
Electronic Resource
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
Influence of End Restraints on Strain Responses of Anisotropic Tuff During Triaxial Compression
| Online Contents | 2022
Generalized crack damage stress thresholds of hard rocks under true triaxial compression
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Generalized crack damage stress thresholds of hard rocks under true triaxial compression
| Springer Verlag | 2020
Stress conditions in triaxial compression
| Engineering Index Backfile | 1960