Three-Dimensional Combined Finite-Discrete Element Modeling of Shear Fracture Process in Direct Shearing of Rough Concrete–Rock Joints
| Autor: | Younghun Ko, Gyeonggyu Kim, Sang-Ho Cho, Gyeongjo Min, Moonkyung Chung, Daisuke Fukuda, Hongyuan Liu, Se-Wook Oh |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
asperity dilatation GPGPU parallelization 0211 other engineering and technologies 02 engineering and technology Surface finish 010502 geochemistry & geophysics lcsh:Technology 01 natural sciences Physics::Geophysics lcsh:Chemistry Friction angle General Materials Science Fracture process lcsh:QH301-705.5 Instrumentation Joint (geology) 021101 geological & geomatics engineering 0105 earth and related environmental sciences Fluid Flow and Transfer Processes Shearing (physics) asperity degradation lcsh:T Process Chemistry and Technology General Engineering Mechanics lcsh:QC1-999 Discrete element method combined finite-discrete element method (FDEM) Computer Science Applications Condensed Matter::Soft Condensed Matter concrete-rock joint lcsh:Biology (General) lcsh:QD1-999 Shear (geology) lcsh:TA1-2040 asperity sliding Direct shear test lcsh:Engineering (General). Civil engineering (General) lcsh:Physics |
| Zdroj: | Applied Sciences, Vol 10, Iss 8033, p 8033 (2020) Applied Sciences Volume 10 Issue 22 |
| ISSN: | 2076-3417 |
| DOI: | 10.3390/app10228033 |
| Popis: | A three-dimensional combined finite-discrete element element method (FDEM), parallelized by a general-purpose graphic-processing-unit (GPGPU), was applied to identify the fracture process of rough concrete&ndash rock joints under direct shearing. The development process of shear resistance under the complex interaction between the rough concrete&ndash rock joint surfaces, i.e., asperity dilatation, sliding, and degradation, was numerically simulated in terms of various asperity roughness under constant normal confinement. It was found that joint roughness significantly affects the development of overall joint shear resistance. The main mechanism for the joint shear resistance was identified as asperity sliding in the case of smoother joint roughness and asperity degradation in the case of rougher joint asperity. Moreover, it was established that the bulk internal friction angle increased with asperity angle increments in the Mohr&ndash Coulomb criterion, and these results follow Patton&rsquo s theoretical model. Finally, the friction coefficient in FDEM appears to be an important parameter for simulating the direct shear test because the friction coefficient affects the bulk shear strength as well as the bulk internal friction angle. In addition, the friction coefficient of the rock&ndash concrete joints contributes to the variation of the internal friction angle at the smooth joint than the rough joint. |
| Databáze: | OpenAIRE |
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