期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：304
期号：5
页码：1-7
DOI：10.1088/1755-1315/304/5/052057
出版社：IOP Publishing
摘要：Based on the non-linear shear behaviour obtained by many researchers' direct shear test, an exponential degradation model about the joint roughness is introduced into Barton-Bandis shear strength criterion to describe the non-linear post-peak shear behaviour. In the degradation model, the joint roughness coefficient (JRC) gradually decreases with the shear displacement to account for asperity degradation during shear process, and the decay rate decreases. Finally the JRC falls to a constant value that corresponds to the residual shear resistance of the joint and the decay rate decreases to zero. At last, the model is used to fit experimental data for different materials of joints, and the high fitting accuracy shows its validity.
