期刊
ROCK MECHANICS AND ROCK ENGINEERING
卷 51, 期 4, 页码 989-1004出版社
SPRINGER WIEN
DOI: 10.1007/s00603-017-1388-7
关键词
Basic friction angle; Direct shear test; Triaxial compression test; Tilt test; Hwangdeung granite; Berea sandstone
资金
- Korean government (Ministry of Education)
- Korea Research Foundation [NRF-2015R1D1A1A01056665]
Samples of Hwangdeung granite from Korea and Berea sandstone from USA, both containing sliding planes, were prepared by saw-cutting or polishing using either #100 or #600 grinding powders. Their basic friction angles were measured by direct shear testing, triaxial compression testing, and tilt testing. The direct shear tests and triaxial compression tests on the saw-cut, #100, and #600 surfaces indicated that the most reliable results were obtained from the #100 surface: basic friction angle of 29.4A degrees for granite and 34.1A degrees for sandstone. To examine the effect of surface conditions on the friction angle in tilt tests, the sliding angles were measured 50 times with two surface conditions (surfaces cleaned and not cleaned after each measurement). The initial sliding angles were high regardless of rock type and surface conditions and decreased exponentially as measurements continued. The characteristics of the sliding angles, differences between tilt tests, and dispersion between measurements in each test indicated that #100 surface produced the most reliable basic friction angle measurement. Without cleaning the surfaces, the average angles for granite (32 measurements) and sandstone (23 measurements) were similar to the basic friction angle. When 20-50 measurements without cleaning were averaged, the basic friction angle was within +/- 2A degrees for granite and +/- 3A degrees for sandstone. Sliding angles using five different tilting speeds were measured but the average was similar, indicating that tilting speed (between 0.2A degrees and 1.6A degrees/s) has little effect on the sliding angle. Sliding angles using four different sample sizes were measured with the best results obtained for samples larger than 8 x 8 cm.
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