Deformation Mechanisms of Crushable Blocky Materials Upon Lateral Unloading for a Biaxial Stress State

Liu, Enlong

doi:10.1007/s00603-011-0210-1

Cited by 7 publications

(1 citation statement)

References 16 publications

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“…Test samples are given though a scaled-down gradation curve which is from the actual gradation curve of gob materials [1,[10][11][12][13]. And uniaxial confined, biaxial, and triaxial compression tests were used to research compression behaviors, void characteristics, deformation and breakage properties, and secant and tangent modulus of caved rocks and similar materials [1,[13][14][15]. Moreover, the fractal theory has been used to study longwall goaf porosity and permeability distribution [10], the seepage theory has been used to study permeability characteristics under uniaxial compression using water flow [11,12], and the diffusion theory has been used to study Co 2 and N 2 for the influence of gas migration rule [3].…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Internal Behaviors of Caved Rocks under the Uniaxial Confined Compression

Zhāng¹,

Feng²,

Qi³

2017

Advances in Materials Science and Engineering

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As main composition of longwall gob, caved rocks’ behaviors and their impacts under compression crucially influence strata control, subsidence, associated resources extraction, and many other aspects. However, current researches are based on a whole sample, due to looseness of caved rocks and limitation of observation technology. In this paper, an experiment system was built to investigate internal behaviors of caved rocks’ sample, under the uniaxial confined compression, including movement and breakage behavior by the digital image processing technologies. The results show that the compression process of caved rocks could be divided into two stages by relative density. Boundary effect and changes of voids and contact pressure among caved rocks lead to different movement law in different position in sample’s interior. A stratification phenomenon of breakage was discovered, which presents breakage concentration in the middle of the sample. The nonlinear movement and shear dislocation induced by shifts among caved rocks are the reason of the breakage stratification phenomenon. This phenomenon would have an effect on the permeability and seepage research of similar medium.

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