Experimental study on instability destruction of slab-failure brittle rock under influences of loading rates

JIN Aibing; CHEN Long; WU Shunchuan; GUO Pei; SUN Beibei

doi:10.11779/CJGE20230241

Volume 46 Issue 6

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Chinese Journal of Geotechnical Engineering > 2024 > 46(6): 1215-1225. > DOI: 10.11779/CJGE20230241

JIN Aibing, CHEN Long, WU Shunchuan, GUO Pei, SUN Beibei. Experimental study on instability destruction of slab-failure brittle rock under influences of loading rates[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(6): 1215-1225. DOI: 10.11779/CJGE20230241

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Experimental study on instability destruction of slab-failure brittle rock under influences of loading rates

JIN Aibing^{1, 2,},
CHEN Long^{1, 2, 3},
WU Shunchuan^{1, 2, 4, ,},
GUO Pei^{1, 2, 5},
SUN Beibei^{1, 2}

1.
Civil and Resource Engineering School, University of Science and Technology Beijing, Beijing 100083, China
2.
Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine, University of Science and Technology Beijing, Beijing 100083, China
3.
China Railway Development and Investment Group Co., Kunming 650500, China
4.
Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China
5.
State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, Beijing 102211, China

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Received Date: March 19, 2023
Available Online: June 04, 2024

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Abstract

Abstract

Excavation of deep brittle rock often leads to slab failure, and may further to flake spalling, rock explosion and other engineering disasters, which is a serious threat to the safety of construction of deeply buried tunnels. In deep rock mass engineering, the rate of stress redistribution after excavation varies due to the factors such as tectonic stress, excavation conditions and engineering disturbances. In order to investigate the effects of loading rates on the destabilization damage of slab-failure surrounding rock, the unilateral limit uniaxial compression tests are conducted using brittle rock processed into slab-failure specimens, and the macroscopic rupture, strength characteristics, acoustic emission (AE) characteristics and energy mechanism of the specimens are comprehensively investigated under different loading rates. The results show that: (1) The specimens exhibit large pieces of spalling, overall instability and separation under low loading rates. The specimens did not separate in large pieces under high loading rates, but there are small pieces of power ejection. The compressive strength of the specimens increases with the increase of the loading rates. (2) The increase of low frequency and high amplitude signals and the change of b-value indicate that the specimens have a sudden failure instability propagation, and the large- and small-scale fractures are alternately generated during this process. (3) At the steady loading stage, the high loading rates make the AE activity of the specimens more intense, while the opposite is true at the near destabilization damage stages, and the low-frequency signal and large-scale fracture events account for a greater proportion under low loading rates. The difference in the speed of stress re-distribution due to different excavation schemes and construction methods in engineering is the cause of further damage in different modes after the occurrence of slab failure in the surrounding rock.
- slab failure,
- acoustic emission,
- brittle rock,
- parameter analysis,
- failure mode

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References

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Experimental study on instability destruction of slab-failure brittle rock under influences of loading rates

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