关键词: 油页岩　含油率　应力—应变曲线　破坏模式　主应变场　声发射　能量演化

Abstract: There is a huge difference in oil content of oil shale,and this change in oil content will cause differences between their mechanical properties and destructive breakdown characteristics. Select vertical oil shard samples with a oil content of 6. 5%,6%,5%,and 3%. It carried out a single-axis compression experiment,field strain and acoustic emission monitoring. Studies have found that the increase in oil content will reduce the pressure resistance of oil shale and transform it from crispy to delay. High oil-content oil shale is prone to shear-tensor damage. Low oil-content oil shale destruction mode is biased towards tensor damage. During the loading process,the main strain field of the oil shale is transformed from a uniform distribution to a concentrated distribution. The shear phenomenon in the field change weakened. A high oil-content sample ringing count is the growth of the stepped type. After the damage,there is still a high ringing count. The high ringing count of low oil-content oil shale occurs only when it is destroyed. Under the same elasticity conditions,the deformation of low oil-content oil shale in the energy storage stage is smaller. The high oil-content sample has a certain delay. After the sample reaches the peak of the stress, the elasticity is not fully released,and some elasticity is still retained. Low oil-content samples have strong anti-deformation capacity, so under the same strain conditions,their scattered energy is higher.

Key words: oil shale,oil content,stress-strain curve,destruction mode,main strain field,acoustic emission,energy evolution