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Article: Thermal effect on rock strength: strengthening-weakening transition explored by grain-based model

TitleThermal effect on rock strength: strengthening-weakening transition explored by grain-based model
Authors
KeywordsGrain-based model
Microstructural heterogeneity
Rock strength
Thermal strengthening/weakening
Issue Date24-Oct-2023
PublisherSpringer
Citation
Acta Geotechnica, 2023 How to Cite?
Abstract

Rock strength typically decreases when the rock is subjected to temperatures higher than 400 °C. Our previous experimental study on Sichuan Marble showed that the rock was strengthened rather than weakened in the temperature range 25–200 °C. To numerically model the thermal strengthening/weakening behavior of rock, a grain-based model integrating the thermal effects on grains and grain boundaries in an applicable temperature range 25–400 °C (thermo-GBM) is proposed. A Voronoi-tessellated thermo-GBM (GBM-1) is calibrated and verified by our experimental triaxial compressive tests equipped with real-time heating from 25 to 200 °C. The same tests are simulated on another thermo-GBM with realistic rock microstructure (GBM-2) to investigate the effects of microstructural heterogeneity. The results suggest that increasing microstructural heterogeneity leads to a higher extent of thermal strengthening. Such an effect is amplified by the application of confining pressure, but it is less dependent on the treated temperature. Then, both uniaxial compression strength (UCS) and confined strength tests are simulated on GBM-1 in a higher temperature range 250–400 °C to examine the strengthening phenomenon. Thermal strengthening takes place in all the confined test groups but not in the UCS test group. The thermal strength is enhanced by 8.1% at 250 °C as compared with that at room temperature, and decreases to the non-heated value at 350 °C. The results suggest that thermal expansion leading to a more compacted structure is the governing mechanism in strengthening effect, meanwhile the degradation of grain-boundary properties is a major competing factor to weaken the rock.


Persistent Identifierhttp://hdl.handle.net/10722/339556
ISSN
2023 Impact Factor: 5.6
2023 SCImago Journal Rankings: 2.089
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWong, Louis Ngai Yuen-
dc.contributor.authorZhang, Yahui-
dc.contributor.authorCui, Xin-
dc.contributor.authorWu, Zhijun-
dc.date.accessioned2024-03-11T10:37:35Z-
dc.date.available2024-03-11T10:37:35Z-
dc.date.issued2023-10-24-
dc.identifier.citationActa Geotechnica, 2023-
dc.identifier.issn1861-1125-
dc.identifier.urihttp://hdl.handle.net/10722/339556-
dc.description.abstract<p>Rock strength typically decreases when the rock is subjected to temperatures higher than 400 °C. Our previous experimental study on Sichuan Marble showed that the rock was strengthened rather than weakened in the temperature range 25–200 °C. To numerically model the thermal strengthening/weakening behavior of rock, a grain-based model integrating the thermal effects on grains and grain boundaries in an applicable temperature range 25–400 °C (thermo-GBM) is proposed. A Voronoi-tessellated thermo-GBM (GBM-1) is calibrated and verified by our experimental triaxial compressive tests equipped with real-time heating from 25 to 200 °C. The same tests are simulated on another thermo-GBM with realistic rock microstructure (GBM-2) to investigate the effects of microstructural heterogeneity. The results suggest that increasing microstructural heterogeneity leads to a higher extent of thermal strengthening. Such an effect is amplified by the application of confining pressure, but it is less dependent on the treated temperature. Then, both uniaxial compression strength (UCS) and confined strength tests are simulated on GBM-1 in a higher temperature range 250–400 °C to examine the strengthening phenomenon. Thermal strengthening takes place in all the confined test groups but not in the UCS test group. The thermal strength is enhanced by 8.1% at 250 °C as compared with that at room temperature, and decreases to the non-heated value at 350 °C. The results suggest that thermal expansion leading to a more compacted structure is the governing mechanism in strengthening effect, meanwhile the degradation of grain-boundary properties is a major competing factor to weaken the rock.<br></p>-
dc.languageeng-
dc.publisherSpringer-
dc.relation.ispartofActa Geotechnica-
dc.subjectGrain-based model-
dc.subjectMicrostructural heterogeneity-
dc.subjectRock strength-
dc.subjectThermal strengthening/weakening-
dc.titleThermal effect on rock strength: strengthening-weakening transition explored by grain-based model-
dc.typeArticle-
dc.identifier.doi10.1007/s11440-023-02049-2-
dc.identifier.scopuseid_2-s2.0-85174570911-
dc.identifier.eissn1861-1133-
dc.identifier.isiWOS:001090413300002-
dc.identifier.issnl1861-1125-

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