Creep properties of sandstone under different confining pressures and research on a nonlinear viscoelasto-plastic creep model

被引：0
|
作者：
Liu D. [1 ]
Xie L. [1 ]
Tuo X. [1 ]
Long L. [1 ]
机构：
[1] School of Civil Engineering, Chongqing University, Chongqing
来源：
| 1600年 / Academia Sinica卷 / 36期
基金：
中国国家自然科学基金;
关键词：
Different confining pressures; Nonlinear viscoelasto-plastic model; Parameter identification; Rock creep; Rock mechanics;
D O I：
10.13722/j.cnki.jrme.2017.0023
中图分类号：
学科分类号：
摘要：
The creep rules of sandstone are obtained based on the creep test results under different confining pressures. The results show that, Burgers model can effectively describe the instantaneous elastic deformation, attenuation and steady creep deformation of sandstone, and the results fitting at the least square method demonstrate Kelvin model has optimization effect to Burgers model. According to the accelerating creep results under different confining pressures, a modified visco-plastic creep model is obtained by introducing the empirical model and combining Kelvin model for its optimization, and it reflects the accelerated creep characteristics accurately. By combining this modified model with Burgers model in series, a new nonlinear viscoelasto-plastic model can be put forward. Using the 1stOpt software to identify the new model parameters, the results are satisfactory. A comparison between the test and theoretical curves proves the validity of the proposed model. © 2017, Science Press. All right reserved.
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页码：3705 / 3712
页数：7
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