Experimental study on impact failure law of water-saturated granite with initial damage

CHU Huaibao; CHEN Luyang; YANG Xiaolin; WANG Donghui; WEI Haixia; SUN Bo

doi:10.11883/bzycj-2024-0036

Volume 45 Issue 1

Jan. 2025

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CHU Huaibao, CHEN Luyang, YANG Xiaolin, WANG Donghui, WEI Haixia, SUN Bo. Experimental study on impact failure law of water-saturated granite with initial damage[J]. Explosion And Shock Waves, 2025, 45(1): 013101. doi: 10.11883/bzycj-2024-0036

cover[J]. Explosion And Shock Waves, 2021, 41(2): .

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Experimental study on impact failure law of water-saturated granite with initial damage

doi: 10.11883/bzycj-2024-0036

School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China

Received Date: 2024-01-22
Rev Recd Date: 2024-03-25

Available Online: 2024-03-26

Publish Date: 2025-01-01

Abstract

Abstract

X-ray diffraction test was used to analyze the changes in the mineral composition of the granite before and after filling with water to study the effects of saturated water and initial damage degree on macroscopic and microscopic failure characteristics of granite under impact load. The Hopkinson device was used to carry out dynamic mechanical tests on the granite samples under different states to analyze the dynamic mechanical properties of the granite and the block size characteristics under different states. In addition, some of the granite fragments after impact were selected for electron microscope scanning test to analyze the fracture failure characteristics. The fractal dimension was used to analyze the fragmentation degree of the granite fragments after impact and the scanning images of the fracture under electron microscopy. The influence of the image magnification selected during electron microscope scanning on the fractal dimension is discussed. The micro-cracking mechanism of granite induced by saturated water under impact load is briefly analyzed. The results show that the mineral composition of the saturated granite changes compared with the natural granite. The proportions of hornblende, albite, microcline, and quartz in the saturated granite decrease, while the proportion of kaolinite increases significantly. With the increase of initial damage, the dynamic peak stress of granite gradually decreases while the fragmentation degree and the fractal dimension of the block increase gradually, and the influence of initial damage on the fractal dimension of the block is greater than that of saturated water. With the increase of initial damage, more micro-cracks and debris appear in the fracture image, and the fractal dimension of the fracture image increases gradually. In a certain range, the fractal dimension of electron microscope scanning images increases with the increase of image magnification, but when the image exceeds a certain multiple, the fractal dimension will decrease. The research results can provide some theoretical and engineering references for the failure and instability mechanism analysis of disturbed water-saturated granite with initial damage in geotechnical engineering.
- rock dynamics,
- mineral composition,
- fragmentation degree,
- microstructure of fracture,
- fractal dimension

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References

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