太原理工大学学报2024，Vol.55Issue(2)：252-259,8.DOI:10.16355/j.tyut.1007-9432.20230637
高温蒸汽作用后油页岩变角剪切特性规律研究
Study on Shear Failure Characteristics of Oil Shale under High-temperature Steam Treatment
摘要
Abstract
[Purposes]In the process of in-situ steam-assisted oil shale extraction,the shear strength of oil shale plays a crucial role in the stability of injection and production wells as well as the mining gallery.Additionally,the shear strength of rock formation is influenced by temperature.The variations in the shear characteristics of oil shale under different temperatures and shear angles are in-vestigated.[Methods]A steam generation apparatus was employed to heat the oil shale.In the exper-imental setup,steam temperatures were set at 100,200,300,400,and 500℃,separately.Subse-quently,the steam-treated oil shale was subjected to variable-angle shear experiments at shear angles of 45°,55°,and 65°.According to the experiment results,the variable-angle shear parameters and peak shear strain of the oil shale were calculated.Furthermore,an analysis of the shear failure charac-teristics of the oil shale following exposure to different steam conditions was conducted.[Findings]The research findings can be summarized as follows:1)At steam temperatures below 300℃,oil shale exhibits pronounced brittle failure characteristics,while at temperatures of 400℃ and 500℃,ductile failure characteristics becomes more evident;2)The cohesion of oil shale first increases and then decreases with the increase of steam temperature.Similarly,the internal friction angle decreases initially with rising steam temperature,followed by an increase.The shear strength decreases as the shear angle increases;3)The peak shear strain of the oil shale increases with steam temperature ris-ing,and high shear angle has a significant impact on the peak shear strain of the rock;4)The shear failure mode of the oil shale transitions from penetrating failure to combined failure with an increase in steam temperature,along with an increase in secondary cracks.关键词
岩石力学/油页岩/蒸汽/变角剪切/剪切参数/破坏特征Key words
rock mechanics/oil shale/steam/variable angle shear/shear parameter/failure characteristics分类
矿业与冶金引用本文复制引用
曹京哲,杨栋,康志勤,冯利鸿..高温蒸汽作用后油页岩变角剪切特性规律研究[J].太原理工大学学报,2024,55(2):252-259,8.基金项目
国家重点研发计划项目(2019YFA0705501) （2019YFA0705501）
