含Y型组合节理花岗岩单轴压缩破坏机理及声发射特征
Uniaxial Compression Failure Mechanism and Acoustic Emission Characteristics of Granite with Y-Type Composite Joints
张鹏海 1马庆山 1刘溪鸽 1杨天鸿1
作者信息
- 1. 东北大学 资源与土木工程学院,辽宁 沈阳 110819
- 折叠
摘要
利用劈裂法在花岗岩试件中预制不同倾角的Y型组合节理,进行单轴压缩实验,分析组合节理倾角对破坏模式、峰值强度、表面变形场、声发射能量释放特征的影响,探究不同破坏模式下的破坏机理.实验结果表明:1)含Y型组合节理岩石随节理倾角变化呈现整体破坏、楔形体弹射破坏和沿主节理面破坏三种主要模式;2)组合节理夹角、主节理倾角均与岩石强度具有负相关关系;3)破坏模式从整体破坏转变到弹射破坏、沿主节理破坏时,滑移变形集中区域由次节理向主节理转变,AE高能级事件诱发原因由主、次节理压密及滑移错动向主节理压密及滑移错动转变;4)随主节理倾角的不断增大,主节理面上释放的能量更高、能量的分布更加不均匀.
Abstract
Y-type composite joints with different inclination angles are prefabricated in granite specimens using the splitting method,and uniaxial compression experiments are conducted.The effects of the inclination angle of the composite joint on the failure mode,peak strength,surface deformation field,and acoustic emission energy release characteristics are analyzed,and the failure mechanism under different failure modes is explored.The experimental results show that:1)Rock with Y-shaped composite joints exhibit three main failure modes:overall failure,wedge ejection failure,and failure along the main joint surface,which vary with joint inclination;2)The angle of composite joints and the inclination angle of main joints have a negative correlation with rock strength;3)When the failure mode transitions changes from overall failure to ejection failure and failure along the main joint,the concentrated slip deformation zone shifts from the secondary joint to the main joint,and the high-energy AE events induce a transition from the main and secondary joint compaction and slip dislocation to the main joint compaction and slip dislocation;4)As the inclination angle of the main joint increases,the energy released on the main joint surface is higher and the distribution of energy is more uneven.
关键词
组合节理/破坏模式/强度/变形场/声发射Key words
composite joints/failure mode/strength/deformation field/acoustic emission(AE)引用本文复制引用
出版年
2024
NETL
NSTL
万方数据