Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Ultrasonic Investigation of Shear Slip Nucleation in Granular Materials under Variable Normal Stresses
Understanding the role of normal stress variations in rock joints with fill materials has important implications for interpretation of rock slope failures, fault movements, and earthquake nucleation. In this study, the main objective is to explore the impact of normal stress variations on shear failure of granular fill materials by utilizing ultrasonic shear waves. For this purpose, granular quartz specimens were sheared in a single direct shear apparatus equipped with an ultrasonic imaging system. The experimental program consisted of different phases to simulate natural conditions including the reduction in the applied effective stress. The obtained data provided measures of variations in shear strength and frictional stability as well as ultrasonic wave attributes with the changes in normal stress and shearing velocity. The results indicated a close link between the changes in ultrasonic amplitude and the layer porosity. Observed slip and creep phases were also captured in the transmitted amplitude variations. Moreover, an ultrasonic precursor to the dynamic shear failure was identified in the form the transmitted amplitude rate change.
Ultrasonic Investigation of Shear Slip Nucleation in Granular Materials under Variable Normal Stresses
Understanding the role of normal stress variations in rock joints with fill materials has important implications for interpretation of rock slope failures, fault movements, and earthquake nucleation. In this study, the main objective is to explore the impact of normal stress variations on shear failure of granular fill materials by utilizing ultrasonic shear waves. For this purpose, granular quartz specimens were sheared in a single direct shear apparatus equipped with an ultrasonic imaging system. The experimental program consisted of different phases to simulate natural conditions including the reduction in the applied effective stress. The obtained data provided measures of variations in shear strength and frictional stability as well as ultrasonic wave attributes with the changes in normal stress and shearing velocity. The results indicated a close link between the changes in ultrasonic amplitude and the layer porosity. Observed slip and creep phases were also captured in the transmitted amplitude variations. Moreover, an ultrasonic precursor to the dynamic shear failure was identified in the form the transmitted amplitude rate change.
Ultrasonic Investigation of Shear Slip Nucleation in Granular Materials under Variable Normal Stresses
Gheibi, Amin (Autor:in) / Davis, Lucy (Autor:in) / Hedayat, Ahmadreza (Autor:in)
Geo-Congress 2020 ; 2020 ; Minneapolis, Minnesota
Geo-Congress 2020 ; 425-433
21.02.2020
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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