The Creep Properties of Fine Sandstone under Uniaxial Tensile Stress

Journal of Engineering Science and Technology Review

卷:8

Zhao Baoyun¹  Xue Kaixi²  Jiang Haifei³  Xie Yuanguang³ 

[1] 2 School of Civil Engineering and Architecture, Chongqing Universityof Science and Technology, Chongqing 401331, China;

[2] 3 Civil and Environmental Engineering Department, College of Engineering and Computer Science, California State University, Fullerton, 800 N. State College Blvd, CA92834, United States;

[3] International College, Chongqing Jiaotong University, Chongqing 400074, China;

关键词: Fine sandstone;    Direct tensile test;    Creep;    Nonlinear creep model;    Model identification __________________________________________________________________;   

DOI  :  

来源: DOAJ

【 摘 要 】

A graduated uniaxial direct tensile creep test for fine sandstone is conducted by adopting a custom-designed direct tensiletest device for rock. The experiment shows that the tensile creep of fine sandstone has similar creep curve patterns tothose of compression creep, while the ratios of the creep strain to the total strain obtained in the tensile tests aresubstantially higher than those obtained for similar compression tests, which indicates that the creep ability of rock in thetensile process is higher than that in the uniaxial compression process. Based on the elastic modulus in the approximatelylinear portion of the obtained isochronous stress-strain curves of the tensile creep, the time dependence of the elasticitymodulus for the Kelvin model is evaluated, and a revised generalized Kelvin model is obtained by substitution into thegeneralized Kelvin model. A new viscousplastic model is proposed to describe the accelerated creep properties, and thismodel is combined in series with the revised generalized Kelvin model to form a new nonlinear viscoelastic-plastic creepmodel that can describe the properties of attenuation creep, steady creep, and accelerated creep. Comparison of the testand theoretical curves demonstrates that they are nearly identical, which verifies the performance of the model.

【 授权许可】

Unknown