Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Investigate the Mode I Fracture Characteristics of Granite After Heating/-$ LN_{2} $ Cooling Treatments
https://orcid.org/0000-0002-4962-0644
Abstract Thermal treatment of the warm rock mass using liquid nitrogen ($ LN_{2} $) is a prospective rock fracturing technology in many geo-engineering applications. This paper presents an experimental and numerical work aimed at investigating the effect of thermal treatments (i.e., heating–$ LN_{2} $ cooling) on fracture failure characteristics. Mode I fracture toughness as a function of thermal treatment was determined using semi-circular bending tests. The roughness of the resultant fracture surfaces was quantitatively evaluated with a 3D laser scanner and fractal theory. Experimental results show that the thermal treatment has a significant influence on the fracture toughness and roughness. The fracture toughness of the thermally treated samples shows a negative correlation with the heating temperature, except in the range of 25–200 ºC where the fracture toughness shows a slight increase. However, the fracture roughness of thermally treated samples shows an opposite trend as it gradually increases with temperature. Scanning electron microscope analysis associates these phenomena to the development of thermal microcracks. Moreover, numerical simulations using the finite-discrete element method thermo-mechanical code (FDEM-TM) were conducted to reproduce the thermo/mechanical behavior of thermally treated rock, and to help explain the influence of the thermally induced microcracks on the failure mechanisms. The thermally induced microcracks contribute to the variation of the fracture toughness and roughness according to the laboratory experiment and numerical simulation. This work provides an improved understanding of the temperature effect on rock fracture characteristics in engineering applications.
Highlights Fracture characteristics of the heating-cooling treated granite are investigated. Fracture toughness first rises and then drops when heating temperature increases.Fracture roughness shows a positive correlation with the heating temperature.Numerical models reproduce the laboratory results and help to explain the failure mechanism.Thermal microcracks contribute to the variation of fracture toughness and fracture roughness.
Investigate the Mode I Fracture Characteristics of Granite After Heating/-$ LN_{2} $ Cooling Treatments
https://orcid.org/0000-0002-4962-0644
Abstract Thermal treatment of the warm rock mass using liquid nitrogen ($ LN_{2} $) is a prospective rock fracturing technology in many geo-engineering applications. This paper presents an experimental and numerical work aimed at investigating the effect of thermal treatments (i.e., heating–$ LN_{2} $ cooling) on fracture failure characteristics. Mode I fracture toughness as a function of thermal treatment was determined using semi-circular bending tests. The roughness of the resultant fracture surfaces was quantitatively evaluated with a 3D laser scanner and fractal theory. Experimental results show that the thermal treatment has a significant influence on the fracture toughness and roughness. The fracture toughness of the thermally treated samples shows a negative correlation with the heating temperature, except in the range of 25–200 ºC where the fracture toughness shows a slight increase. However, the fracture roughness of thermally treated samples shows an opposite trend as it gradually increases with temperature. Scanning electron microscope analysis associates these phenomena to the development of thermal microcracks. Moreover, numerical simulations using the finite-discrete element method thermo-mechanical code (FDEM-TM) were conducted to reproduce the thermo/mechanical behavior of thermally treated rock, and to help explain the influence of the thermally induced microcracks on the failure mechanisms. The thermally induced microcracks contribute to the variation of the fracture toughness and roughness according to the laboratory experiment and numerical simulation. This work provides an improved understanding of the temperature effect on rock fracture characteristics in engineering applications.
Highlights Fracture characteristics of the heating-cooling treated granite are investigated. Fracture toughness first rises and then drops when heating temperature increases.Fracture roughness shows a positive correlation with the heating temperature.Numerical models reproduce the laboratory results and help to explain the failure mechanism.Thermal microcracks contribute to the variation of fracture toughness and fracture roughness.
Investigate the Mode I Fracture Characteristics of Granite After Heating/-$ LN_{2} $ Cooling Treatments
https://orcid.org/0000-0002-4962-0644
Abstract Thermal treatment of the warm rock mass using liquid nitrogen ($ LN_{2} $) is a prospective rock fracturing technology in many geo-engineering applications. This paper presents an experimental and numerical work aimed at investigating the effect of thermal treatments (i.e., heating–$ LN_{2} $ cooling) on fracture failure characteristics. Mode I fracture toughness as a function of thermal treatment was determined using semi-circular bending tests. The roughness of the resultant fracture surfaces was quantitatively evaluated with a 3D laser scanner and fractal theory. Experimental results show that the thermal treatment has a significant influence on the fracture toughness and roughness. The fracture toughness of the thermally treated samples shows a negative correlation with the heating temperature, except in the range of 25–200 ºC where the fracture toughness shows a slight increase. However, the fracture roughness of thermally treated samples shows an opposite trend as it gradually increases with temperature. Scanning electron microscope analysis associates these phenomena to the development of thermal microcracks. Moreover, numerical simulations using the finite-discrete element method thermo-mechanical code (FDEM-TM) were conducted to reproduce the thermo/mechanical behavior of thermally treated rock, and to help explain the influence of the thermally induced microcracks on the failure mechanisms. The thermally induced microcracks contribute to the variation of the fracture toughness and roughness according to the laboratory experiment and numerical simulation. This work provides an improved understanding of the temperature effect on rock fracture characteristics in engineering applications.
Highlights Fracture characteristics of the heating-cooling treated granite are investigated. Fracture toughness first rises and then drops when heating temperature increases.Fracture roughness shows a positive correlation with the heating temperature.Numerical models reproduce the laboratory results and help to explain the failure mechanism.Thermal microcracks contribute to the variation of fracture toughness and fracture roughness.
Investigate the Mode I Fracture Characteristics of Granite After Heating/-$ LN_{2} $ Cooling Treatments
Shao, Zuliang (Autor:in) / Sun, Lei (Autor:in) / Aboayanah, Kareem Ramzy (Autor:in) / Liu, Quansheng (Autor:in) / Grasselli, Giovanni (Autor:in)
2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
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