An Experimental Study on the Creep Characteristics of Sandstone in the Interval of Different Critical Stresses. (16th July 2021)

• Record Type: Journal Article
• Authors: Yang, Chao; Dong, Xingchen; Xu, Xuan; Sun, Qiancheng
• Other Names: Tao Zhigang Academic Editor.
• Is Part Of: Shock and vibration. Volume 2021(2021)
• Publication Date: 2021-07-16
• Subjects: Shock (Mechanics) -- Periodicals; Vibration -- Periodicals; 534.5
• DOI: 10.1155/2021/4604027
• Languages: English
• ISSNs: 1070-9622

Abstract

Abstract : Creep tests on brittle sandstone specimens were performed to investigate the time-dependent characteristics in the interval of different critical stresses. The results showed that failure will not occur when the loaded stress σ 1 is less than the critical stress of dilation σ cd, while all specimens were destroyed when σ 1 is larger than σ cd . In addition, the value of σ cd was very close to the long-term strength obtained by the method of the isochronous stress-strain curve. Therefore, σ cd can be regarded as the long-term strength of the sandstone specimens. When σ 1 is larger than σ cd, the time required for the failure of specimen t f decreases with the increase of σ 1 ; the creep rate d ε /d t increases with time t, and the specimen will be destroyed when it reaches a maximum value (d ε /d t )max . Both relationships t f and σ 1 and (d ε /d t )max and σ 1 can be described by the exponential function. Then, a nonlinear damage creep model considering the deformation damage and strength damage in the interval of different critical stresses was established, which can describe the whole creep process and predict the failure time of sandstone specimens.