层理影响下油页岩力学性质与破坏断裂特征  

Mechanical Properties and Damage Fracture Characteristics of Oil Shale under Influence of Lamination

作　　者：甘泽 李富平 杨曦[1,2] 甘德清 GAN Ze;LI Fuping;YANG Xi;GAN Deqing(College of Mining Engineering,North China University of Science and Technology,Tangshan 063210,China;Mining Development and Safety Technology Key Laboratory of Hebei Province,Tangshan 063210,China)

机构地区：[1]华北理工大学矿业工程学院,河北唐山063210 [2]河北省矿业开发与安全技术实验室,河北唐山063210

出　　处：《煤炭技术》2025年第1期57-62,共6页Coal Technology

摘　　要：为明确层理角度对油页岩力学性质与破坏断裂特征的影响,选取0°、60°和90°层理角度油页岩试样,对其开展单轴压缩实验、场应变与声发射监测。研究发现:水平层理会使油页岩的压密阶段更为显著。垂直层理、60°层理和水平层理油页岩的破坏模式分别为劈裂型的剪切-张拉破坏、剪切破坏和穿层劈裂破坏。垂直层理油页岩容易形成多条平行应变集中条带;60°层理角度油页岩更容易在截切面形成主要应变集中条带;水平层理油页岩应变集中条带主要沿着水平层理分布,并在水平应变集中条带之间形成纵向的穿层应变集中条带。垂直层理试样的振铃计数表现为阶梯上升,水平层理与60°层理试样表现为振铃计数在破坏阶段的陡然增加。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.

关 键 词：油页岩 层理 应力应变曲线 破坏模式 主应变场 声发射 

分 类 号：TD315[矿业工程—矿井建设] P618.12[天文地球—矿床学] TE662[天文地球—地质学]