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黄金科学技术 ›› 2024, Vol. 32 ›› Issue (3): 470-480.doi: 10.11872/j.issn.1005-2518.2024.03.054

• 采选技术与矿山管理 • 上一篇    下一篇

微波照射下大理岩孔隙结构变化特征及能量演化规律

李想1(),杨建国2,杨博2,李杰林1(),周科平1   

  1. 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
  • 收稿日期:2024-02-24 修回日期:2024-04-01 出版日期:2024-06-30 发布日期:2024-07-05
  • 通讯作者: 李杰林 E-mail:1023492778@qq.com;lijielin@163.com
  • 作者简介:李想（1999-），男，河北唐山人，硕士研究生，从事金属矿山开采及矿山岩石力学等研究工作。1023492778@qq.com
  • 基金资助:
    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”(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”(2020-JSKS-SYS-06)

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

Xiang LI1(),Jianguo YANG2,Bo YANG2,Jielin LI1(),Keping ZHOU1   

  1. 1.School of Resources and Safety Engineering, Central South University, Changsha 410083, Hunan, China
    2.Tianhe Daoyun (Beijing) Technology Co. , Ltd. , Beijing 100176, China
  • Received:2024-02-24 Revised:2024-04-01 Online:2024-06-30 Published:2024-07-05
  • Contact: Jielin LI E-mail:1023492778@qq.com;lijielin@163.com

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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。

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

Abstract:

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/m3 to 299.07 kJ/m3，with a decrease of 14.78%.The elastic energy decreases from 311.68 kJ/m3 to 240.49 kJ/m3，with a decrease of 22.84%.The dissipated energy increases from 39.25 kJ/m3 to 58.58 kJ/m3，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 /m3 to 289.70 kJ /m3，with a decrease of 13.41%.The elastic energy decreases from 287.39 kJ/m3 to 223.07 kJ/m3，with a decrease of 22.38%.The dissipated energy increases from 47.19 kJ/m3 to 66.70 kJ/m3，with an increase of 41.34%.The results show that the quality，hardness，wave velocity，peak strength and elastic modulus of marble decrease and the porosity increases with the increase of microwave irradiation power and time.With the increase of microwave irradiation power and time，the internal energy of the sample is converted，the proportion of dissipative energy is increased，and the proportion of elastic energy is decreased.The research results reveal the changes of pore structure and energy evolution of marble under microwave irradiation，which also has certain reference significance for the damage evolution mechanism of other types of rock.

Key words: microwave irradiation power, microwave radiation time, pore structure, damage model, energy evolution, rock damage

中图分类号: 

  • TU45

图1

试验系统及流程示意图"

图2

不同辐射时间和照射功率下微波作用大理岩的应力—应变曲线"

表1

微波照射前后大理岩基本物理参数"

试样编号微波作用条件作用前平均质量/g作用后平均质量/g作用前平均硬度作用后平均硬度
D1~D30 kW，0 s508.33508.2944
D4~D60 kW，60 s508.25508.1044
D7~D90 kW，180 s509.01508.8444
D10~D120 kW，300 s508.44508.1644
D13~D151 kW，0 s508.26508.1644
D16~D181 kW，60 s507.99507.8244
D19~D211 kW，180 s508.65508.3644
D22~D241 kW，300 s509.27508.8843
D25~D272 kW，0 s509.06508.9744
D28~D302 kW，60 s508.94508.6344
D31~D332 kW，180 s508.80508.3243
D34~D362 kW，300 s508.02507.8043
D37~D393 kW，0 s509.11508.3044
D40~D423 kW，60 s507.92507.2443
D43~D453 kW，180 s508.63507.8943
D46~D483 kW，300 s508.71508.0643

图3

不同辐射时间和照射功率下微波作用大理岩的波速变化"

图4

不同辐射时间和照射功率下微波作用大理岩的峰值强度变化"

图5

微波辐射时间为180 s条件下大理岩的累积孔隙度变化"

图6

微波照射功率为2 kW条件下大理岩孔隙度随辐射时间的变化"

图7

微波辐射时间为180 s条件下大理岩孔隙度随照射功率的变化"

图8

微波照射功率为1 kW条件下大理岩能量随辐射时间的变化"

图9

微波辐射时间为180 s条件下大理岩能量随照射功率的变化"

图10

大理岩试样内部能量与微波辐射时间和照射功率的关系"

图11

不同辐射时间和照射功率条件下损伤变量与微波作用的关系"

图12

大理岩裂纹扩展变化"

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