黔西南金矿砂岩动静组合加载岩石力学特性研究

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中文摘要：为探究巷道开挖后围岩不同深度切向应力不同程度的增加对围岩动力学性能的影响,采用改进的分离式霍普金森压杆(split Hopkinson pressure bar,SHPB)试验系统,对黔西南金矿砂岩试件在0,10,20,30,40 MPa的轴压下进行动静组合加载试验,旨在分析砂岩在不同轴压下的力学行为、变形特征与能量演化规律.研究发现:动静组合加载试样应力-应变曲线分为压密阶段、弹性阶段、塑性破坏和峰后阶段;轴压使得峰值应变逐渐增加,极限应变逐渐降低;动态弹性模量、动态抗压强度、应变率及各能量的演化规律均呈现以 10 MPa为转折点的变化规律.

外文标题：Study on the Mechanical Properties of Sandstone Under Dynamic and Static Combined Loading in Gold Ore in Southwest Guizhou

外文摘要：In order to explore the influence of the increase of tangential stress at different depths of surrounding rock after roadway excavation,an improved split Hopkinson pressure bar(SHPB)test system was used to carry out dynamic and static combined loading tests on sandstone specimens of gold ore in southwest Guizhou under axial compression of 0,10,20,30 and 40 MPa,aiming to analyze the mechanical behavior,deformation characteristics and energy evolution law of sandstone under different axial compression.It is found that the stress-strain curve of the specimen under dynamic and static combined loading is divided into compaction stage,elastic stage,plastic failure stage and post-peak stage.Axial compression makes the peak strain increase gradually and the ultimate strain decrease gradually.The dynamic elastic modulus,dynamic compressive strength,strain rate and the evolution of each energy all show the change rule with 10 MPa as the turning point.

外文关键词：

sandstonedynamic and static combined loadingsplit Hopkinson pressure barrock dynamics

作者：

左宇军、胡赏、林健云、潘超、孙文吉斌、陈斌、陈庆港、荣鹏

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作者单位：

贵州大学矿业学院,贵州贵阳 550025

贵州大学资源与环境学院,贵州贵阳 550025

关键词：

砂岩动静组合加载 SHPB 岩石动力学

基金：

国家自然科学基金贵州省矿山动力灾害预警与控制技术科技创新人才团队项目贵州省科技支撑计划贵州省科技支撑计划贵州省高层次创新型人才培养资助项目

项目编号：

52374118黔科合平台人才[2019]5619黔科合支撑[2022]一般247黔科合支撑[2021]一般516黔科合人才[2016]4011号

出版年：

2024

DOI：

10.15958/j.cnki.gdxbzrb.2024.02.01

贵州大学学报(自然科学版)

贵州大学

贵州大学学报(自然科学版)

CSTPCD

影响因子：0.396

ISSN：1000-5269

年,卷(期)：2024.41(2)

参考文献量26