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

• Published in: Geotechnical and geological engineering Vol. 38; no. 5; pp. 4521 - 4528
• Main Authors: Liu, Dongqiao, Lin, Youwen, Wang, Yang, He, Manchao, Zhang, Shudong
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.10.2020; Springer Nature B.V
• Subjects: Acoustic emission; Caverns; Civil Engineering; Disintegration; Dredging; Dynamic loads; Earth and Environmental Science; Earth Sciences; Excavation; Friction; Friction reduction; Geotechnical Engineering & Applied Earth Sciences; Granite; Hydrogeology; Loads (forces); Mechanical loading; Original Paper; Roads; Rock masses; Rocks; Sliding; Slumping; Static loads; Terrestrial Pollution; Waste Management/Waste Technology; Fractured rock mass; Sin-wave disturbance; AE; Ultra-low friction; Image acquisition
• ISSN: 0960-3182; 1573-1529
• DOI: 10.1007/s10706-020-01306-5

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.