摘要
为探究煤火区砂岩原有内部孔隙率对其力学性能产生的影响,采用分离式Hopkinson压杆(SHPB)试验技术,研究了不同孔隙率的砂岩试件在25、200、400、600、800、1 000℃温度条件下力学性能的影响规律。结果表明:在同一孔隙率下,不同温度热处理的砂岩的应力-应变、应力-应变率曲线变化趋势基本一致;随着热处理温度的升高,砂岩峰值应力呈现先上升后下降的趋势,砂岩峰值应变率呈现先下降后上升的趋势,热处理温度为400℃时,出现最值。在同一温度下,当热处理温度≤400℃时,随着孔隙率的增加,峰值应力减小但峰值应变率增加;当热处理温度>400℃时,随着孔隙率的增加,峰值应力增加但峰值应变率却减小。
To investigate the effect of the original internal porosity of sandstone in coal fire areas on its mechanical properties,the split Hopkinson pressure bar(SHPB)test technique was employed to study the variation laws of mechanical properties of sandstone specimens with different porosities under thermal treatment at temperatures of 25,200,400,600,800,and 1000℃.The results show that:under the same porosity,the stress-strain and stress-strain rate curves of sandstone subjected to thermal treatment at different temperatures exhibit basically consistent variation trends;with the increase of thermal treatment temperature,the peak stress of sandstone first increases and then decreases,while the peak strain rate of sandstone first decreases and then increases,and the extreme values(maximum for peak stress and minimum for peak strain rate)occur when the thermal treatment temperature is 400℃.At the same temperature,when the thermal treatment temperature is≤400℃,the peak stress decreases but the peak strain rate increases with the increase of porosity;when the thermal treatment temperature is>400℃,the peak stress increases but the peak strain rate decreases as the porosity increases.
作者
吴萍
陈巧丽
陆华
崔莹
WU Ping;CHEN Qiao-li;LU Hua;CUI Ying(School of Digital Economy and Management,Yinchuan University of Science and Technology,Yinchuan 750021,China;School of Mechanical Engineering,Ningxia Polytechnic University of Business and Technology,Yinchuan 750021,China;School of Civil Engineering,North Minzu University,Yinchuan 750021,China)
出处
《工程爆破》
北大核心
2025年第5期28-33,共6页
Engineering Blasting
基金
宁夏自然科学基金优秀青年基金资助项目(2024AAC05102)
2024年自治区重点研发计划引才专项基金资助项目(2024BEH04054)
宁夏工商职业技术学院2024年度院级自然科学类科研基金资助项目(NXGS2024ZR06)。
关键词
砂岩
SHPB
孔隙率
温度
动态力学性能
sandstone
Split Hopkinson Pressure Bar
porosity
temperature
dynamic mechanical properties
