Effect of Shear Rate on the Strength Characteristics of Rock Joints(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2015年第05期
- Page:
- 101-110
- Research Field:
- 工程地质
- Publishing date:
Info
- Title:
- Effect of Shear Rate on the Strength Characteristics of Rock Joints
- Author(s):
- ZHENG Bo-wen; QI Sheng-wen; ZHAN Zhi-fa; ZOU Yu; ZHANG Shi-shu
- 1. Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. PowerChina Chengdu Engineering Corporation Limited, Chengdu 610072, Sichuan, China
- Keywords:
- rock mechanics; joint; direct shear test; shear rate; peak shear strength; total friction angle; asperity
- PACS:
- TU432;TU452
- DOI:
- -
- Abstract:
- The study on mechanical characteristics of rock discontinuity under different shear rates is an important premise of rock slope dynamic response analysis. Based on Barton peak shear strength theory and root mean square first-order derivative method calculating joint roughness coefficient, the laboratory direct shear test results of peak shear strength of rock joint under different shear rates with constant normal stress in previous researches were calculated, the effects of shear rate on total friction angle of rock joint were discussed, and the empirical formula of peak shear strength of rock joint related to the shear rate was proposed. The results show that when the shear rates are 0-0.8 mm·s-1, the total friction angles of rock joint samples vary in the form of negative logarithm with the variation of shear rate; the total friction angles of rock joints decrease with the increase of shear rate for rock joints with relative strong homogeneity and isotropy, and increase with the increase of shear rate for rock joints with relative strong heterogeneity and anisotropy, and the increase range of the latter is less than that of the former; the physical property and microscopic geometry of rock joints play an important effect on the variation of total friction angles with the increase of shear rate, the physical property of rock joints plays an important effect on the increase or decrease tendency of total friction angle, and the microscopic geometry of rock joints plays a significant effect on the variation range of total friction angle.
Last Update: 2015-09-28