The law of strength damage and deterioration of jointed sandstone after dry-wet cycles

Under the periodic rise and fall of the water level in the Three Gorges Reservoir in China, the rock mass in the ebb and flow zone of the slope is always in a state of a dry-wet cycle. In order to explore the influence of dry-wet cycle on mechanical properties of jointed sandstone, the triaxial and...

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Bibliographic Details
Published in:Journal of mountain science 2023-04, Vol.20 (4), p.1170-1182
Main Authors: Wang, Gui-lin, Zhang, Tian-yu, Zhang, Liang
Format: Article
Language:English
Subjects:
Canyons
Compression
Compression tests
Compressive strength
Criteria
Cycles
Damage
Deterioration
Earth and Environmental Science
Earth Sciences
Ecology
Environment
Geography
Jointed rock
Mechanical properties
Modulus of elasticity
Original Article
Rock masses
Rocks
Sandstone
Sediment samples
Sedimentary rocks
Strength
Triaxial compression tests
Water levels
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Summary:Under the periodic rise and fall of the water level in the Three Gorges Reservoir in China, the rock mass in the ebb and flow zone of the slope is always in a state of a dry-wet cycle. In order to explore the influence of dry-wet cycle on mechanical properties of jointed sandstone, the triaxial and uniaxial compression tests of dry-wet cycle of jointed sandstone were carried out. For the experiment, four groups of samples with different numbers of joints were set up, and the jointed rock samples were subjected to 20 dry-wet cycles. Using both the triaxial compression test and the Mohr-Coulomb (M-C) rock fracture criterion, the strength envelope of the sandstone samples was fitted, and their strength degradation was further analyzed and studied. The results show that: ① The peak intensity and elastic modulus of the sandstone samples decrease with increased number of dry-wet cycles. ② The total deterioration of mechanical properties of intact rock samples is bigger than that of jointed sandstone samples as the number of dry-wet cycles increases. ③ With the increase of confining pressure, the peak intensity of intact sandstone samples increases muchmore than that of jointed sandstone samples, which indicates that joints and their numbers have obvious influence. ④ Joints and their numbers play an important role in guiding the damage effects of sandstone samples, which weaken the damage caused by dry-wet cycles. Therefore, the envelope of the M-C strength criterion of intact sandstone samples moves more than that of jointed sandstone samples.
ISSN:1672-6316
1993-0321
1008-2786
DOI:10.1007/s11629-022-7605-1