MATEC Web Conf.
Volume 213, 20182018 6th Asia Conference on Mechanical and Materials Engineering (ACMME 2018)
|Number of page(s)||5|
|Section||Building Materials and Rock Mechanics|
|Published online||15 October 2018|
Study on the Estimation of Rock Rheological Parameters under Multi-level Loading and Unloading Conditions
China National Institute of Standardization, 100191, Beijing, China
Determining reasonable rheological constitutive models based on laboratory rock creep test data and estimating rheological parameters are important means of studying rheological mechanical property of rocks. Previous rock uniaxial or triaxial compression creep tests mostly adopted the method of multi-level loading. In order to study the influence of unloading stress on the estimation of rock rheological parameters, rock triaxial creep tester RLW-2000 was used in this paper to carry out triaxial compression creep tests for granites in a given area with two different stress paths of multi-level loading and stepwise unloading. Study results indicate that rock rheological parameters obtained vary with different stress paths. The instantaneous elastic modulus and viscosity coefficient obtained through loading show a stepwise increase, while the viscoelastic modulus shows a progressive decrease.
© The Authors, published by EDP Sciences, 2018
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