Influence of the Crack Angle on the Deformation and Failure Characteristics of Sandstone under Stepped Cyclic Uniaxial Compression with a Constant Lower Limit

Yuanmin Wang, Yunqiang Wang, Song Luo (), Hao Liu, Guansheng Yi and Kang Peng
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Yuanmin Wang: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Yunqiang Wang: State Key Laboratory of Coal Mine Disaster Dynamics and Control, School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, China
Song Luo: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Hao Liu: College of Aerospace Engineering, Chongqing University, Chongqing 400044, China
Guansheng Yi: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Kang Peng: School of Resources and Safety Engineering, Central South University, Changsha 410083, China

Mathematics, 2023, vol. 11, issue 9, 1-19

Abstract: Engineering rock structures containing joints and fissures are frequently subjected to discontinuous periodic disturbances of varying amplitudes. To attain the quantitative relationship between the crack angle and the mechanical and deformation properties of rock under complex stress paths, uniaxial cyclic loading and unloading tests with increasing stress gradients were conducted on sandstone specimens containing a single crack of different angles. Our results showed that the bearing capacity of the sandstone increased as the crack angle increased. The irreversible strain and elastic moduli of the rock presented a sudden increase when entering the next cycle of the stepped loading. However, the entire loading process can be divided into three stages according to their respective trends. These three stages correspond to the three stages of rock deformation, i.e., the pore crack compaction stage, the elastic deformation to the stable micro-elastic crack development stage, and the unstable crack development stage. In addition, the crack angle of sandstone showed a negative correlation with the irreversible strain, but a positive correlation with the elastic modulus. With the increasing crack angle, the failure mode of the rock changed from the tensile-shear failure to the shear failure, and then to the interlayer dislocation failure.

Keywords: mechanical and deformation characteristics; stress path; crack angle; constant lower limit; failure mode (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2023
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