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Time-dependent failure characteristics of natural jointed granite of deep tunnel under different dip angles conditions.
- Source :
-
Acta Geotechnica . May2024, Vol. 19 Issue 5, p3075-3093. 19p. - Publication Year :
- 2024
-
Abstract
- To investigate the time-dependent characteristics of jointed rock masses, a series of single-step true triaxial creep tests were conducted on natural jointed granite samples under different dip angles conditions. The results showed that the time-dependent failure of jointed granite behave as two different forms, namely, stress-controlled and stress-structure-controlled failure. When the dip angle of joint is less than 70° or greater than 77°, stress-controlled failure was the predominate mode. Otherwise, stress-structure-controlled failure occurred. There are similarities and differences in the evolution mechanisms of these two types of time-dependent failure. Similarly, the acoustic emission (AE) count rate demonstrated multiple peaks in both types of time-dependent failure processes. Differently, for stress-controlled failure, tensile microcracks and large-scale shear cracks develop alternately until the ultimate failure is reached, but for stress-structure-controlled failure, tensile cracks are dominant in the early stage and followed by plenty of shear cracks in the later stage. [ABSTRACT FROM AUTHOR]
- Subjects :
- *GRANITE
*ACOUSTIC emission
*CREEP (Materials)
*MICROCRACKS
*ROCK creep
*ANGLES
Subjects
Details
- Language :
- English
- ISSN :
- 18611125
- Volume :
- 19
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Acta Geotechnica
- Publication Type :
- Academic Journal
- Accession number :
- 177481430
- Full Text :
- https://doi.org/10.1007/s11440-023-02201-y