Open AccessPost-peak roughness degradation model based on Barton-Bandis criterion for rock joint
Author(s) -
Jinmei Wang,
Yingbin Zhang,
Pan Wang
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/304/5/052057
Subject(s) - direct shear test , joint (building) , surface finish , shear (geology) , exponential function , materials science , geotechnical engineering , residual , shear rate , shear strength (soil) , surface roughness , asperity (geotechnical engineering) , mechanics , residual strength , composite material , geology , structural engineering , mathematics , engineering , mathematical analysis , physics , soil science , algorithm , viscosity , soil water
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.