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Volume 40 Issue 3
May  2021
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Article Navigation >  Bulletin of Geological Science and Technology  > 2021  >  40(3): 163-172
Cao Yangbing, Chen Yuhua, Zhang Peng, Huang Zhenping, Zhang Xiangxiang, Chen Yangtao. Failure characteristics and mechanism of biotite monzogranite with different water content under uniaxial compression[J]. Bulletin of Geological Science and Technology, 2021, 40(3): 163-172. doi: 10.19509/j.cnki.dzkq.2021.0308
Citation: Cao Yangbing, Chen Yuhua, Zhang Peng, Huang Zhenping, Zhang Xiangxiang, Chen Yangtao. Failure characteristics and mechanism of biotite monzogranite with different water content under uniaxial compression[J]. Bulletin of Geological Science and Technology, 2021, 40(3): 163-172. doi: 10.19509/j.cnki.dzkq.2021.0308
shu

Failure characteristics and mechanism of biotite monzogranite with different water content under uniaxial compression

doi: 10.19509/j.cnki.dzkq.2021.0308
  • Received Date: 01 Aug 2020
    Abstract
  • The deformation and failure characteristics and mechanism of granite under different water content are of great significance to the stability evaluation of this kind of engineering rock mass. The uniaxial compression tests of biotite monzogranite under different water content were carried out to analyze the failure characteristics and stress-strain curve characteristics. The fracture scanning electron microscope test was carried out to analyze the micro morphology characteristics, and study the failure mechanism of granite. The test results show that: biotite monzogranite has obvious strain softening characteristics. With the increase of water content, the length of the microfracture compaction stage increases, while the length of the stable fracture stage and the unstable fracture stage gradually shortens, but the proportion increases, and the fluctuation alternation in the pre-peak stage of the curve intensifies. Compared with dry samples, the uniaxial compressive strength and elasticity modulus of saturated sample decreased by 40.68% and 20.3% respectively. The deformation and failure process can be roughly divided into five stages: quiescent stage, crack initiation stage, crack growth with particle ejection stage, flaky debris peeling with particle ejection stage and caving failure stage. With the increase of water content, the intensity, sound and brittleness of granite failure gradually decrease. In general, the failure mechanism of granite is tension-shear composite failure. When the granite with low water content, the dominant failure mechanism is tensile failure induced by compression; with the increase of water content, the tensile failure decreases and the shear failure increases; and while the granite is in saturation, the dominant failure mechanism is shear failure. The research results can provide theoretical support for the construction of coupling model between biotite monzogranite and water, and have important scientific significance for the stability analysis of engineering rock mass under water-rock coupling environment.

     

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