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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Creep damage properties and nonlinear creep model of red sandstone treated at high temperature based on acoustic emission
This work studies the creep damage behaviors and nonlinear creep model of red sandstone treated at high temperature. The porosity change, creep strain, long-term strength, creep rate and acoustic emission characteristics of red sandstone treated at high temperature are analyzed. After the red sandstone is treated at a high temperature of 800 °C, some micropores in the sample evolve into macropores, the creep strain increases, and the long-term strength decreases. Before the loading stress reaches the long-term strength (σ<σs), the AE cumulative count increases slowly and approximately linearly with increasing the strain. After the loading stress exceeds the long-term strength (σ≥σs), the AE cumulative count increases rapidly and approximately nonlinearly with increasing the strain. Moreover, a nonlinear function that can simulate the decay creep deformation of rock is introduced, a time-triggered damage viscous body is proposed based on Harris function, and a nonlinear creep model is established. The constructed creep model overcomes shortcomings of the traditional Bingham model that cannot describe the decay creep and accelerated creep stages. Through the parameter inversion and sensitivity analysis of the creep test data, the constructed nonlinear creep model can be applied to investigate the creep problem of geotechnical engineering under high temperature environment.
Creep damage properties and nonlinear creep model of red sandstone treated at high temperature based on acoustic emission
This work studies the creep damage behaviors and nonlinear creep model of red sandstone treated at high temperature. The porosity change, creep strain, long-term strength, creep rate and acoustic emission characteristics of red sandstone treated at high temperature are analyzed. After the red sandstone is treated at a high temperature of 800 °C, some micropores in the sample evolve into macropores, the creep strain increases, and the long-term strength decreases. Before the loading stress reaches the long-term strength (σ<σs), the AE cumulative count increases slowly and approximately linearly with increasing the strain. After the loading stress exceeds the long-term strength (σ≥σs), the AE cumulative count increases rapidly and approximately nonlinearly with increasing the strain. Moreover, a nonlinear function that can simulate the decay creep deformation of rock is introduced, a time-triggered damage viscous body is proposed based on Harris function, and a nonlinear creep model is established. The constructed creep model overcomes shortcomings of the traditional Bingham model that cannot describe the decay creep and accelerated creep stages. Through the parameter inversion and sensitivity analysis of the creep test data, the constructed nonlinear creep model can be applied to investigate the creep problem of geotechnical engineering under high temperature environment.
Creep damage properties and nonlinear creep model of red sandstone treated at high temperature based on acoustic emission
Acta Geotech.
Pan, Xiaokang (Autor:in) / Zhou, Xiaoping (Autor:in)
Acta Geotechnica ; 18 ; 4077-4095
01.08.2023
19 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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