The creep behavior of rocks has been broadly researched because of its extensive application
in geomechanics. Since the time-dependent stability of underground constructions is
a critical aspect of geotechnical engineering, a comprehensive understanding of the
creep behavior of rocks plays a pivotal role in ensuring the safety of such structures.
Various factors, including stress level, temperature, rock damage, water content,
rock anisotropy, etc., can influence rocks’ creep characteristics. One of the main
topics in the creep analysis of rocks is the constitutive models, which can be categorized
into empirical, component, and mechanism-based models. In this research, the previously
proposed creep models were reviewed, and their main characteristics were discussed.
The effectiveness of the models in simulating the accelerated phase of rock creep
was evaluated by comparing their performance with the creep test results of different
types of rocks. The application of rock’s creep analysis in different engineering
projects and adopting appropriate creep properties for rock mass were also examined.
The primary limitation associated with empirical and classical component models lies
in their challenges when it comes to modeling the tertiary phase of rock creep. The
mechanism-based models have demonstrated success in effectively simulating the complete
creep phases; nevertheless, additional validation is crucial to establish their broader
applicability. However, further investigation is still required to develop creep models
specific to rock mass. In this paper, we attempted to review and discuss the most
recent studies in creep analysis of rocks that can be used by researchers conducting
creep analysis in geomechanics.
