Micromechanical behaviour in shearing of reproduced flat LBS grains with strong and weak artificial bonds
| Autor: | Kostas Senetakis, Sathwik S. Kasyap, Matthew Richard Coop, Jidong Zhao |
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| Rok vydání: | 2020 |
| Předmět: |
Shearing (physics)
Materials science 010102 general mathematics 0211 other engineering and technologies Micromechanics 02 engineering and technology Particle displacement Geotechnical Engineering and Engineering Geology 01 natural sciences law.invention Normal load Portland cement Shear (geology) Breakage law Solid mechanics Earth and Planetary Sciences (miscellaneous) 0101 mathematics Composite material 021101 geological & geomatics engineering |
| Zdroj: | Acta Geotechnica. 16:1355-1376 |
| ISSN: | 1861-1133 1861-1125 |
| Popis: | The shearing behaviour of reproduced flat LBS grains artificially bonded with ordinary Portland cement (OPC) and plaster of Paris (PP) was examined using micromechanical experiments. Monotonic shearing tests showed a distinct variation in the load–displacement relationship at low, medium and high normal loads, and a nonlinear shear strength envelope was proposed. For OPC-bonded sand grains, a brittle–ductile transition at 20–30 N normal load was observed and three breakage mechanisms in shearing (chipping, shear cracks and crushing) were distinguished in accordance with the changes in the load–displacement curves. OPC-bonded sands showed a predominant dilation at lower normal loads, whereas PP-bonded sands were highly compressive. Based on previously published works using element-scale tests, a new mechanism for dilation under micromechanical testing was proposed in the study. Cyclic shearing tests were conducted on OPC-bonded sands, and the effects of increased displacement amplitude and normal load were highlighted. |
| Databáze: | OpenAIRE |
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