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Experimental Study on Ultra-low Friction Effect of Granite Block Under Coupled Static and Dynamic Loads

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Abstract

Zonal disintegration widely exists in the excavation roadways and caverns in deep rock masses. Ultra-low friction can be generated in the deep fractured rock masses, which reduces or disappears under dynamic loading. In this paper, granite blocks were processed into cube specimens with a cylindrical hole in center. Static loads and sinusoidal disturbances were applied to study the sliding phenomenon between blocks. During the experiments, real-time images, and acoustic emissions were recorded. Results indicate blocks above the cylindrical hole slide during the second half of the sinusoidal disturbance, and block sliding is caused by a reduction of friction between the blocks. The existence of ultra-low friction can be inferred from this experiment.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (No. 51704298).

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Correspondence to Yang Wang.

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Liu, D., Lin, Y., Wang, Y. et al. Experimental Study on Ultra-low Friction Effect of Granite Block Under Coupled Static and Dynamic Loads. Geotech Geol Eng 38, 4521–4528 (2020). https://doi.org/10.1007/s10706-020-01306-5

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  • DOI: https://doi.org/10.1007/s10706-020-01306-5

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