Author: WANG Gang ZHANG Zhensong ZHANG Xianda MA Ming ZHAO Cheng LIAN Lian | Time: 2020-01-10 | Counts: |
doi:10.16186/j.cnki.1673-9787.2020.1.17
Received:2019-03-11 00:00:00
Revised:2019-04-16 00:00:00
Published:2020/01/15
Macroscopic and mesoscopic mechanisms of shear failure of irregular fillingjoints and its strength model
WANG Gang1, ZHANG Zhensong1, ZHANG Xianda1, MA Ming1, ZHAO Cheng2,3, LIAN Lian1
1.College of Engineering Architeture, Shandong University of Science and Technology, Qingdao 266590 , Shandong, China;2.College of Engineering ,Tibet University, Lhasa 850012 , Tibet, China;3.College of Civil Engineering, Tongji University, Shanghai 200092 , China;4.State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590 , Shandong, China
Abstract:In order to study the macroscopic and mesoscopic behaviors of the irregular filling joints during the shearing process, nine kinds of upper and lower joints of different roughness were generated and simulated by the two-dimensional particle flow program PFC2D. The results showed that in the process of macro-damage of deformed filling joint surface, the local damage firstly occurs on both sides of the filling, then cracks began to appear on the joint edge, and finally, the bonding surface between the filling and the joint was damaged. In the process of meso-scale failure, firstly, the particles on both sides moved, and the displacement of the intermediate particles was small due to the bonding effect of the filler. However, as the bonding surface is destroyed by shearing, the displacement difference of the particles inside the specimen gradually disappeared, showing the overall displacement of the upper specimen. The peak shear strength of the special-shaped filling joint surface was affected by the roughness of the joint surfaces on both sides during the simulation process, showing the rule that the roughness was closer to the strength. A new formula for peak shear strength of filled joint surface was improved by simplifying the model, which provided a theoretical basis for further research.
Key words:irregular filling joint surface;particle flow simulation;parallel bond model;particle displacement
异形充填节理剪切破坏宏细观机理及强度模型_王刚.pdf