摘要
采用自主研发的实时高温蒸汽加热单轴压缩实验系统,分别对实时蒸汽加热和蒸汽加热冷却后油页岩的压缩特性和破坏特征规律进行了研究。实验中蒸汽的温度测点分别设置为100℃,200℃,300℃,400℃,500℃,550℃.实验结果表明:1)实时蒸汽加热下油页岩的单轴抗压强度和弹性模量均随着蒸汽温度的升高先降低后升高,400℃时降到最低点,是油页岩力学参数变化的阈值温度;而蒸汽加热冷却后的单轴抗压强度和弹性模量则一直降低;2)实时蒸汽加热下油页岩的峰值应变随着蒸汽温度的升高先增加后降低,在400℃达到最大值,蒸汽加热冷却后的则一直上升;3)实时蒸汽加热下油页岩试件的破坏特征和失稳型式在400℃以下,为由脆性剪切破裂向塑性变形转变,突发失稳向渐进破坏转变,400℃以后为半脆性剪切破裂和准突发失稳;蒸汽加热冷却后,油页岩试件的破坏特征和失稳型式在500℃以下,为脆性剪切破裂和突发失稳,550℃为半脆性剪切破裂和准突发失稳。
In this paper,a self-developed real-time high-temperature steam heating uniaxial compression experimental system was used to study the compression characteristics and failure characteristics of oil shale under real-time steam heating and after steam heating,separately.The temperature of steam tested in the experiment was set as 100,200,300,400,500,and 550℃,separately.The experimental results show that:1)The uniaxial compressive strength and elastic modulus of oil shale under real-time steam heating first decrease and then increase with the increase of steam temperature,and they drop to the lowest point at 400℃,which is the threshold temperature of mechanical parameter change of oil shale;and the uniaxial compressive strength and elastic modulus after steam heating and cooling are reduced continuously.2)The peak strain of oil shale under real-time steam heating first increases and then decreases with the increase of steam temperature,and reaches the maximum value at 400℃;after steam heating and cooling,it keeps rising.3)Below 400℃,the failure characteristics and instability patterns of oil shale specimens under real-time steam heating are from brittle shear fracture to plastic deformation,sudden instability to progressive failure,and above 400℃,they are semi-brittle,shear rupture and quasi-sudden instability;After steam heating and cooling,the failure characteristics and instability type of oil shale specimens are brittle shear fracture and sudden instability below 500℃,and are semi-brittle shearing rupture and quasi-sudden instability above 550℃.
作者
曾庆友
杨栋
康志勤
韩贺旭
ZENG Qingyou;YANG Dong;KANG Zhiqin;HAN Hexu(College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of In-situ Property Improving Mining of Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《太原理工大学学报》
CAS
北大核心
2022年第6期1024-1030,共7页
Journal of Taiyuan University of Technology
基金
国家重点研发计划项目(2019YFA0705501)。
关键词
实时
蒸汽
压缩特性
破坏特征
油页岩
real-time
steam
compression characteristics
failure characteristics
oil shale
