Analysis of axial creep properties of salt rock under low frequency cyclic loading using Burgers model

被引：0
|
作者：
Wang, Jun-Bao [1 ,2 ]
Liu, Xin-Rong [1 ,2 ]
Huang, Ming [3 ]
Yang, Xin [2 ]
机构：
[1] College of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
[2] College of Civil Engineering, Chongqing University, Chongqing 400045, China
[3] College of Civil Engineering, Fuzhou University, Fuzhou 350108, China
来源：
Yantu Lixue/Rock and Soil Mechanics | 2014年 / 35卷 / 04期
关键词：
In order to study the creep properties of salt rock under low frequency cyclic loading; creep tests on salt rock samples under low frequency cyclic loading are carried out by adopting the loading mode of cyclic confining pressure with a constant axial stress. The test results show that up to a certain time; the axial creep curves of salt rock are smooth; while after that point; the axial creep curves clearly fluctuate with the confining pressure. Overall; the axial creep curves of salt rock under low frequency cyclic loading are similar to that of Burgers model. According to the connection relation of component creep model; the Burgers model is divided into Maxwell model and Kelvin model. The axial creep equations of Maxwell model and Kelvin model under the loading mode of cyclic confining pressure with a constant axial stress are deduced respectively in the superposition condition that the fatigue failure of material is neglected; and the effect of loading cycle on the models are also analyzed. Then; by combining the axial creep equations of Maxwell model and Kelvin model; the axial creep equation of Burgers model under cyclic loading is obtained; and the reasonability of which is verified by using the creep test data of salt rock. The result indicates that fitting curves and test curves conform well each other; and the proposed model can well reflect the creep properties of salt rock under cyclic loading; especially the fluctuation of creep deformation with loading change;
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页码：933 / 942
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