摘要
通过控制不同微波预处理工艺参数,基于能量守恒定律,对微波预处理后的花岗岩进行单轴压缩试验研究,分析了花岗岩破坏过程中总应变能、弹性能、耗散能的演化规律。研究结果表明:在微波功率相同的情况下,随着微波辐照时间的增加,试样的纵波波速和抗压强度均呈下降趋势。根据变形破坏中花岗岩的各能量占比及能量演化曲线的变化规律,可将微波辐照下的花岗岩演化过程划分为耗散能初始增长阶段、耗散能稳定增长阶段、耗散能平稳发展阶段、峰前加速耗能阶段和耗散能急剧上升阶段。花岗岩能量演化过程随微波辐照时间的增加呈现出一定的规律性,其第Ⅰ阶段占比随着微波辐照时间的增加逐渐增大。微波辐照时间为600 s时,耗散能占比由未经微波辐照时的17.53%增加至27.07%,基于能量的脆性指数由0.82下降至0.73,岩石的吸能能力和储能极限均有所降低,岩石塑性增强,表明微波有助于岩石从脆性到脆延性的转变。
Based on the law of conservation of energy,uniaxial compression test was carried out on the granite after microwave pretreatment by controlling different parameters of microwave pretreatment.The evolution law of total strain energy,elastic energy and dis-sipative energy during the process of granite failure was analyzed.The research results show that,under the same microwave power,with the increase of microwave irradiation time,the longitudinal wave velocity and compressive strength of the specimen are in a de-creasing trend.According to the change rule of each energy proportion and energy evolution curve of granite in deformation damage,the evolution process of granite under microwave irradiation can be divided into the initial growth stage of dissipated energy,sta-ble growth stage of dissipated energy,stable development stage of dissipated energy,ac-celerated energy dissipation stage in front of the peak,and the stage of sharp rise of dissi-pated energy.The granite energy evolution process shows a certain regularity with the in-crease of microwave irradiation time,and the proportion of its stage I gradually increases with the increase of microwave irradiation time.When the microwave irradiation time is 600 s,the percentage of dissipated energy increases from 17.53%to 27.07%without mi-crowave irradiation,the energy-based brittleness index decreases from 0.82 to 0.73,the energy absorption capacity and energy storage limit of the rock decreases,and the plasticity of the rock enhances,which suggests that the microwave contributes to the rock's transformation from brittle to brittle-ductile.
作者
费鹏
伍琴琴
李天义
黄爱武
刘天明
汪雨婷
喻清
FEI Peng;WU Qinqin;LI Tianyi;HUANG Aiwu;LIU Tianming;WANG Yuting;YU Qing(School of Resources Environment and Safety Engineering,University of South China,Hengyang,Hunan 421001,China;Key Discipline Laboratory of Defense Biotechnology in Uranium Mining and Hydrometallurgy,University of South China,Hengyang,Hunan 421001,China;School of Railway Engineering,Hunan Technical College of Railway High-speed,Hengyang,Hunan 421200,China)
出处
《南华大学学报（自然科学版）》
2024年第2期11-20,共10页
Journal of University of South China：Science and Technology
基金
国家自然科学基金项目(52274167,52274127)
湖南省自然科学基金项目(2021JJ30580,2022JJ40374,2023JJ30516)
湖南省教育厅项目(22A0291,22B0410,20B496)。
关键词
微波辐照
花岗岩
能量演化
脆-延性转变
microwave irradiation
granite
energy evolution
brittle-ductile transformation
