重庆大学学报2024，Vol.47Issue(6)：43-57,15.DOI:10.11835/j.issn.1000.582X.2024.06.005
静动态压缩下千枚岩长径比效应影响研究
Influence of phyllite aspect ratio under static and dynamic compression
摘要
Abstract
This study investigates the influence of aspect ratio on the mechanical properties,energy dissipation,and failure mode of layered phyllite. Uniaxial compression and split Hopkinson pressure bar (SHPB) tests were conducted on phyllite specimens with varying aspect ratios (L/D=0.5,0.6,0.8,1.0,1.2,1.6,2.0) at four inclination angles(α=0°,30°,60°,90°). Results from static uniaxial compression test reveal that the peak strength and the peak strain of phyllite decrease with increasing aspect ratio at different dip angles. Uniaxial dynamic compression tests show that the dynamic compressive strength of phyllite with four bedding dip angles exhibits a quadratic function relationship with the length-diameter ratio of the specimen under dynamic impact compression conditions. With increasing length-diameter ratio,the dynamic compressive strength reaches a peak and then gradually decreases. The peak strain of phyllite decreases exponentially with the aspect ratio of specimen. Energy analysis of dynamic impact compression test indicates a three-stage change in incident energy,reflection energy,and transmission energy of phyllite under different working conditions,from slow rise to rapid rise and finally to being stable. The reflection energy ratio of phyllite increases first and then decreases with the increase of the length-diameter ratio,while the transmission energy ratio shows the opposite trend. Comparative analysis using the energy ratio method reveals that the reflection energy ratio of phyllite reaches its maximum and the transmission energy ratio reaches its minimum when the aspect ratio is L/D=1.2. Macroscopic failure mode analysis indicates that the aspect ratio significantly affects the macroscopic failure mode of phyllite under dynamic impact compression,with smaller the aspect ratios resulting in more complete fractures and larger aspect ratios leading to less sufficient damage.关键词
层状千枚岩/分离式霍普金森杆试验/长径比效应/能量耗散/破坏模式Key words
layered phyllite/split Hopkinson pressure bar test/aspect ratio effect/energy dissipation/failure mode分类
建筑与水利引用本文复制引用
许江波,余洋林,孙国政,孙浩珲,赖杰,王磊..静动态压缩下千枚岩长径比效应影响研究[J].重庆大学学报,2024,47(6):43-57,15.基金项目
陕西省重点研发计划项目(2024GXYBXM-372,2024QCY-KXJ-176,2023-CX-TD-35,2023KXJ-159) （2024GXYBXM-372,2024QCY-KXJ-176,2023-CX-TD-35,2023KXJ-159）
陕西省交通厅(22-38K,23-39R).Supported by Key Research and Development Projects of Shaanxi Province(2024GXYBXM-372,2024QCY-KXJ-176,2023-CX-TD-35,2023KXJ-159),and Department of Transport of Shaanxi Province(22-38K,23-39R). （22-38K,23-39R）
