Experimental Research on the Structural Behavior of Fractured Coal under Uniaxial Compression

Dongjie Xue, Hongwei Zhou, Jianfeng Liu, Jie Zhou, Yintong Liu, Yongwei Zhao and Liao Zhang
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Dongjie Xue: School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China
Hongwei Zhou: School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China
Jianfeng Liu: State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
Jie Zhou: School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China
Yintong Liu: School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China
Yongwei Zhao: School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China
Liao Zhang: School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China

Energies, 2018, vol. 11, issue 10, 1-18

Abstract: Tests of the effects of uniaxial compression on the structural behavior of fractured coals were conducted. The structural behavior is different from the material behavior of intact samples and the discontinuous behavior based on the block theory. It is a macro response of continuous-discontinuous behavior in coal with varied fracture structure geometry, and includes the material behavior with cracking and contact behavior with sliding. The structural behavior is studied based on the complete stress-strain curve, the material parameters, i.e. elastic modulus, Poisson’s ratio, and compression strength, and the structural integrity parameters, i.e. longitudinal and shear wave velocity, and the physical parameter, i.e. density. All the parameters are compared with the different fracture patterns. Various types of parameter degradation damage are defined to describe the structural characteristics with the different fracture patterns. They shows the effective relation of damage with strength. Furthermore, the mechanisms of the structural modulus degradation, structural failure deformation, and structural strength evolution are discussed. The results show that the post-peak behavior can be defined as the structural behavior. With the structural formation-reloading failure cycle, the mutual conversion changes between structural geometry instability and stability, and the characteristics are stress drops or stress platforms generated by structural rebalance. It is pointed out that the post-peak unloading is a macro response of the structural geometry. It includes the recovery of elastic strain and structural resilience strain, and structural stress drop.

Keywords: structural behavior; structural modulus; structural deformation; structural unloading; structural resilience strain; structural stress drop (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
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