Elastoplastic Modelling of an In Situ Concrete Spalling Experiment using the Ottosen Failure Criterion
| Autor: | Topias Siren, Lauri Uotinen |
|---|---|
| Přispěvatelé: | Department of Civil Engineering, Aalto-yliopisto, Aalto University |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Article Subject Plasticity General Chemical Engineering 0211 other engineering and technologies Thin liner 02 engineering and technology 01 natural sciences Industrial and Manufacturing Engineering Stress (mechanics) Ottosen Geotechnical engineering 0101 mathematics Electrical and Electronic Engineering ta216 021101 geological & geomatics engineering Civil and Structural Engineering Mechanical Engineering Strain limit Spall Tangential stress 010101 applied mathematics Spalling Hardware and Architecture lcsh:TA1-2040 Numerical modelling Fracture (geology) Support pressure lcsh:Engineering (General). Civil engineering (General) Concrete |
| Zdroj: | Journal of Engineering, Vol 2017 (2017) |
| ISSN: | 2314-4904 |
| DOI: | 10.1155/2017/4723017 |
| Popis: | An in situ concrete spalling experiment will be carried out in the ONKALO rock characterization facility. The purpose is to establish the failure strength of a thin concrete liner on prestressed rock surface, when the stress states in both rock and concrete are increased by heating. A cylindrical hole 1.5 m in diameter and 7.2 m in depth is reinforced with a 40 mm thin concrete liner from level −3 m down. Eight 6 m long 4 kW electrical heaters are installed around the hole 1 m away. The experiment setup is described and results from predictive numerical modelling are shown. Elastoplastic modelling using the Ottosen failure criterion predicts damage initiation on week 5 and the concrete ultimate strain limit of 0.0035 is exceeded on week 10. The support pressure generated by the liner is 3.2 MPa and the tangential stress of rock is reduced by −33%. In 2D fracture mechanical simulations, the support pressure is 3 MPa and small localized damage occurs after week 3 and damage process slowly continues during week 9 of the heating period. In conclusion, external heating is a potent way of inducing damage and thin concrete liner significantly reduces the amount of damage. |
| Databáze: | OpenAIRE |
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