微波照射下大理岩孔隙结构变化特征及能量演化规律  

Variation Characteristics of Pore Structure and Energy Evolution Law of Marble Under Microwave Irradiation

作　　者：李想 杨建国 杨博 李杰林[1] 周科平[1] LI Xiang;YANG Jianguo;YANG Bo;LI Jielin;ZHOU Keping(School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China;Tianhe Daoyun(Beijing)Technology Co.,Ltd.,Beijing 100176,China)

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083 [2]天河道云(北京)科技有限公司,北京100176

出　　处：《黄金科学技术》2024年第3期470-480,共11页Gold Science and Technology

基　　金：中南大学研究生校企联合创新项目“采空区三维激光扫描精细探测及安全评价研究”(编号:2022XQLH104);金属矿山安全与健康国家重点实验室开放课题“深部高应力巷道围岩结构面与危险块体自动识别方法研究”(编号:2020-JSKS-SYS-06)联合资助。

摘　　要：为研究大理岩在不同微波照射功率和辐射时间下的孔隙结构变化及强度劣化特征,基于核磁共振技术分析不同微波照射功率和辐射时间下大理岩的孔隙结构演化特征,并通过声波和岩石力学强度等测试工作进行验证。同时,建立微波照射下岩石的损伤劣化模型,并基于能量耗散理论分析了大理岩的能量演化过程。结果表明:随着微波照射功率和辐射时间的增加,大理岩的质量、硬度、波速、峰值强度和弹性模量等参数均呈现不同程度的下降,孔隙度升高;随着微波照射功率和辐射时间的增加,试样内部能量发生转换,耗散能能量占比不断增加,弹性能能量占比不断减少。研究结果揭示了微波照射下大理岩内部孔隙结构变化及能量演化规律,对其他类型岩石损伤演化机理具有一定的借鉴意义。In order to study the pore structure change and strength deterioration characteristics of marble under different microwave irradiation power and time,the pore structure evolution characteristics of marble under different microwave power and time were analyzed based on nuclear magnetic resonance technology.With the increase of microwave irradiation power or microwave radiation time,the quality,hardness,wave velocity,peak strength and elastic modulus of marble all show different degrees of decline,and the porosity of the rock increases,and the degree of fragmentation is obvious.They are verified by tests such as acoustic waves and rock mechanical strength.At the same time,the damage degradation model of microwave radiation was established based on NMR,and the damage model had good effect.The damage model can further reflect the damage degree of three kinds of damage variables such as porosity under microwave radiation,and can provide reference for the study of damage and deterioration of similar rocks.In addition,the energy evolution process of marble was analyzed based on the energy dissipation theory.With the increase of microwave power or irradiation time,the release amount of elastic energy becomes less and less,and the elastic deformation changes to plastic deformation.With the increase of microwave radiation time from 60 s to 300 s,the total energy and elastic energy both show a linear downward trend,while the dissipated energy showes a linear upward trend,that is the total energy decreased from 350.93 kJ/m^(3) to 299.07 kJ/m^(3),with a decrease of 14.78%.The elastic energy decreases from 311.68 kJ/m^(3) to 240.49 kJ/m^(3),with a decrease of 22.84%.The dissipated energy increases from 39.25 kJ/m^(3) to 58.58 kJ/m^(3),with an increase of 49.25%.When the microwave irradiation power increased from 1 kW to 3 kW,the total energy and elastic energy also show a linear decline trend,and the dissipative energy showes a linear increase trend,that is the total energy decreases from 334.58 kJ/m^(3) to 289.70 kJ/m^(3),wit

关 键 词：微波照射功率 微波辐射时间 孔隙结构 损伤模型 能量演化 岩石损伤 

分 类 号：TU45[建筑科学—岩土工程]