Deformation and Failure of Deep Sandstone under Axial Static Compression
To investigate the deformation and failure law of deep sandstone,the relationship between plastic zone development,crack propagation and acoustic emission(AE)characteristics is established.Taking deep sandstone samples as the research object,the axial static compression AE test is carried out,the evolution law of plastic zone and internal crack of rock samples is analyzed by numerical simulation.The results show that the dissipation of internal energy density is relatively stable in the compaction and elastic stage,gradually increases in the plastic stage,and all the energy is released immediately before failure.There is a strong correlation between the plastic zone and crack AE characteristics.The ringing count and energy increase first and then decrease in the compaction stage.Before the elastic stage,the plastic zone and micro-cracks appear from both sides of the rock sample.In the elastic stage,the ringing count and energy continue to increase,the increase of the latter is greater than that of the former,the plastic zone develops diagonally inward,and the number of cracks increases.In the plastic stage,the ringing count continues to increase,the energy surges,and the plastic zone develops outwards.In the failure stage,both the ringing count and energy surge,and the simulation test shows a y-shape shear crack,which is consistent with the actual failure crack.
deep sandstoneAE characteristicscrack patternplastic zonedeformation and failure law
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