We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Mechanical Behaviors and Damage Evolution Characteristics of Predamaged Rock under Triaxial Compression Experiment.
- Authors
Guo, Jinshuai; Shang, Wenzheng; Yuan, Jianbo; Liu, Zhigang
- Abstract
The underground rock was disturbed repeatedly during the excavation, resulting in its damage degree gradually accumulated. Therefore, the rock in practical engineering can be regarded as predamaged (PD) rock, and its mechanical behaviors are different from conventional intact rock. This paper proposed the calibrate method to evaluate the predamaged degree of rock based on acoustic emission (AE) ring counts, and the PD rock samples were prepared by uniaxial cyclic loading and unloading test. Then, the triaxial compression experiment of predamaged rock was carried out to study the influence of different predamaged degrees on mechanical behaviors and damage evolution characteristics. The results show that the peak stress and axial strain of PD rock decrease gradually with the increase of predamaged degree. The yield stage of PD rock was significantly shorter than that of intact rock, and it entered the dilation deformation earlier. Furthermore, the constitutive equation of the PD rock based on energy was constructed and the damage evolution characteristics of PD rock were analyzed. It was observed that the bigger the predamaged degree was, the earlier the rock entered the damage, and the failure mode was more complex and crushed. The research results can provide the theoretical basis for the stability control of engineering disturbed rock.
- Subjects
ROCK deformation; AUTOMATIC control systems; ACOUSTIC emission; AXIAL stresses; CYCLIC loads; LOADING &; unloading
- Publication
Advances in Materials Science & Engineering, 2022, p1
- ISSN
1687-8434
- Publication type
Article
- DOI
10.1155/2022/8281362