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Internal state variable creep constitutive model for the rock creep behavior
https://orcid.org/0000-0001-6212-3995
Abstract The phenomenon that the rock deformation increases with time at a state of constant stress is termed as creep behavior of rocks. The creep behavior and creep constitutive model of rock are important for understanding and analyzing the time-dependent geological movements and predicting the long-term stability of underground facilities in rock engineering. Two sets of triaxial creep tests were conducted on mudstone and diabase specimens, and one set of uniaxial creep test was conducted on sandstone specimens to investigate the creep behavior of rocks subject to different stress-strain loading histories. The creep behaviors of the three types of rocks were analyzed, and the creep strain versus time and creep strain rate versus time relations were obtained. The applicability of conventional time-dependent creep constitutive model in describing the creep behavior under complex conditions was discussed. Based on the internal state variable theory, an internal state variable creep constitutive model for the rock creep property was proposed, in which the irreversible axial strain was considered as the internal state variable. The fitting of test data into the strain-dependent hardening law showed that it was capable of describing the creep behavior of rocks experienced complex stress-strain loading histories.
Internal state variable creep constitutive model for the rock creep behavior
https://orcid.org/0000-0001-6212-3995
Abstract The phenomenon that the rock deformation increases with time at a state of constant stress is termed as creep behavior of rocks. The creep behavior and creep constitutive model of rock are important for understanding and analyzing the time-dependent geological movements and predicting the long-term stability of underground facilities in rock engineering. Two sets of triaxial creep tests were conducted on mudstone and diabase specimens, and one set of uniaxial creep test was conducted on sandstone specimens to investigate the creep behavior of rocks subject to different stress-strain loading histories. The creep behaviors of the three types of rocks were analyzed, and the creep strain versus time and creep strain rate versus time relations were obtained. The applicability of conventional time-dependent creep constitutive model in describing the creep behavior under complex conditions was discussed. Based on the internal state variable theory, an internal state variable creep constitutive model for the rock creep property was proposed, in which the irreversible axial strain was considered as the internal state variable. The fitting of test data into the strain-dependent hardening law showed that it was capable of describing the creep behavior of rocks experienced complex stress-strain loading histories.
Internal state variable creep constitutive model for the rock creep behavior
https://orcid.org/0000-0001-6212-3995
Abstract The phenomenon that the rock deformation increases with time at a state of constant stress is termed as creep behavior of rocks. The creep behavior and creep constitutive model of rock are important for understanding and analyzing the time-dependent geological movements and predicting the long-term stability of underground facilities in rock engineering. Two sets of triaxial creep tests were conducted on mudstone and diabase specimens, and one set of uniaxial creep test was conducted on sandstone specimens to investigate the creep behavior of rocks subject to different stress-strain loading histories. The creep behaviors of the three types of rocks were analyzed, and the creep strain versus time and creep strain rate versus time relations were obtained. The applicability of conventional time-dependent creep constitutive model in describing the creep behavior under complex conditions was discussed. Based on the internal state variable theory, an internal state variable creep constitutive model for the rock creep property was proposed, in which the irreversible axial strain was considered as the internal state variable. The fitting of test data into the strain-dependent hardening law showed that it was capable of describing the creep behavior of rocks experienced complex stress-strain loading histories.
Internal state variable creep constitutive model for the rock creep behavior
Qiao, Liping (author) / Wang, Zhechao (author) / Liu, Jie (author) / Li, Wei (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
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