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Rock Mechanics and Rock Engineering

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18.08.2020 | Original Paper

Shear Behavior of Artificial and Natural Granite Fractures After Heating and Water-Cooling Treatment

verfasst von: Yuedu Chen, Chongyuan Zhang, Zhihong Zhao, Xingguang Zhao

Erschienen in: Rock Mechanics and Rock Engineering | Ausgabe 12/2020

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Abstract

A clear understanding of shear behaviors of granite fractures with high temperatures undergoing water-cooling treatment is important in enhanced geothermal system (EGS). Two types of fractured Gonghe granite specimens, containing either a Brazilian-induced artificial fracture and or a pre-existing natural fracture, respectively, were considered. Before direct shear tests, all specimens were suffered from slow heating and rapid water-cooling treatment, and the thermal treatment temperatures ranged from room temperature 25 °C (without thermal treatment) to 300 °C. Shear properties of natural fractures, including shear strength, shear stiffness and shear dilation, are lower than that of the artificial fractures, mainly ascribed to their lower surface roughness than the artificial ones. Better matching in the artificial fractures after thermal treatment contributes to the increase in peak shear strength. The roughness increment or reduction after thermal treatment is insignificant. The thermal treatment results in the larger sheared-off asperities damage volume after shear in the artificial and natural fractures than that without thermal treatment. There is a strong correlation between the shear stress and acoustic emission (AE) parameters in both artificial and natural fractures. The AE responses in natural fractures are weak compared to that in artificial fractures. AE events distribute uniformly near the fracture surface in artificial specimens but present dispersedly in the natural ones.

Vorheriger Artikel Prediction Modeling for the Estimation of Dynamic Elastic Young’s Modulus of Thermally Treated Sedimentary Rocks Using Linear–Nonlinear Regression Analysis, Regularization, and ANFIS

Nächster Artikel A Monitoring Investigation into Rock Burst Mechanism Based on the Coupled Theory of Static and Dynamic Stresses

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Titel: Shear Behavior of Artificial and Natural Granite Fractures After Heating and Water-Cooling Treatment
verfasst von: Yuedu Chen
Chongyuan Zhang
Zhihong Zhao
Xingguang Zhao
Publikationsdatum: 18.08.2020
Verlag: Springer Vienna
Erschienen in: Rock Mechanics and Rock Engineering / Ausgabe 12/2020
Print ISSN: 0723-2632
Elektronische ISSN: 1434-453X
DOI: https://doi.org/10.1007/s00603-020-02221-0

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