摘要
为探究不同功率微波下受载煤体渗透率及破坏变形能量演化特征,采用高压三维可视力学实验设备,开展不同功率微波预处理后煤样的三轴压缩渗流实验。结果表明:不同功率微波处理后煤样弹性模量呈现先降后升趋势,峰值应力与泊松比均呈现下降趋势;随微波功率增加,煤样更容易被压密,径向及体应力-应变曲线整体应变值变大,扩容膨胀现象更加显著;煤样渗透率随功率增加呈现上升趋势,符合对数函数关系;不同预处理煤样峰值应力处的总能量U与弹性能Ue总体呈下降趋势,煤样在弹性阶段积聚弹性能Ue的能力减弱;相同照射时间下相比200 W和600 W微波预处理,400 W微波预处理时各能量变化量明显变大,煤样耗散能Ud占总能量U比值最小,为24%。研究成果可为微波致裂煤层促进瓦斯抽采研究提供参考。
In order to investigate permeability and destructive deformation energy evolution of the loaded coal body under different power microwaves,the high-pressure three-dimensional visual mechanics experimental equipment to carry out the triaxial compressive percolation experiments of the coal samples after microwave pretreatment with different power.Results show that the modulus of elasticity of coal samples after microwave treatment with different powers shows a decreasing and then increasing trend,while the peak stress and Poisson's ratio show a decreasing trend;the increase of microwave power leads to easier compact of coal samples,larger overall strain values of radial and body stress-strain curves,and significant expansion;the permeability of the coal samples increases as power rises,which is consistent with the logarithmic function fitting relationship;the increase of microwave power leads to decreasing total energy U and elastic energy Ue at the peak stress of different pretreated coal samples,and the ability of coal samples to accumulate elastic energy Ue in the elastic stage is weakened.When we compare 200 W and 600 W microwave pretreatment under the same irradiation time,it is found that the change of each energy was more significant in 400 W microwave pretreatment,and the coal samples have the smallest dissipated energy Ud as a proportion of total energy U,at 24%.The study could provide references for gas extraction in microwave fracturing coal seams.
作者
齐消寒
王品
侯双荣
刘阳
朱同光
QI Xiaohan;WANG Pin;HOU Shuangrong;LIU Yang;ZHU Tongguang(School of Safety Science and Engineering,Liaoning Technical University,Huludao Liaoning 125105,China;Key Laboratory of Mine Thermodynamic disasters and Control of Ministry of Education(Liaoning Technical University),Huludao Liaoning 125105,China)
出处
《矿业科学学报》
CSCD
北大核心
2024年第1期66-76,共11页
Journal of Mining Science and Technology
基金
教育部重点实验室开放基金(JSK202010)
国家自然科学基金(52274205)。
关键词
微波
功率
受载煤体
渗透性
能量
microwave
power
loaded coal body
permeability
energy
