Mechanical Properties and Damage Fracture Characteristics of Oil Shale under Influence of Lamination
In order to clarify the influence of the angle of stratification on mechanical properties and damage fracture characteristics of oil shale,oil shale samples with 0°,60° and 90° stratification angles were selected and subjected to uniaxial compression experiments,field strain and acoustic emission monitoring.It was found that the horizontal stratification would make the compaction stage of oil shale more significant.The damage modes of vertically laminated,60° laminated and horizontally laminated oil shale are shear-tension damage,shear damage and through-layer splitting damage,respectively.Vertically laminated oil shale is prone to form multiple parallel strain-concentrating bands;60° laminated oil shale is more prone to form major strain-concentrating bands in the cross-section;horizontally laminated oil shale strain-concentrating bands are mainly distributed along the horizontal laminae,and longitudinal through-laminated strain-concentrating bands are formed between the horizontal strain-concentrating bands.The ringing counts of the vertically laminated specimens showed a stepwise increase,while those of the horizontally laminated specimens and the 60°laminated specimens showed a steep increase in ringing counts during the damage stage.
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