微波照射煌斑岩力学特性研究  

Study on Mechanical Properties of Lamprophyre under Microwave Irradiation

作　　者：郭向辉 杨永康[1] 张慧军[1] GUO Xianghui;YANG Yongkang;ZHANG Huijun(Key Laboratory of In-situ Modified Mining Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学原位改性采矿教育部重点实验室,太原030024

出　　处：《煤炭技术》2023年第11期9-13,共5页Coal Technology

基　　金：国家自然科学基金资助项目(51404167);山西省回国留学人员科研资助项目(HGKY2019038)。

摘　　要：为探究煌斑岩在不同功率微波强度照射后力学特性以及微观结构的变化,利用SEM分析煌斑岩试样在照射前后内部微裂隙的变化,通过单轴和三轴压力机对煌斑岩的抗压强度和抗拉强度进行分析,并使用COMSOL数值模拟软件建立岩石均质模型对实验结果进行验证。研究表明:SEM图像证实了微波可以加速裂纹的扩展和新裂隙的产生;试样在微波照射后单轴抗拉强度和单轴抗压强度均减小,试样表面粗糙度升高,出现细小的颗粒物和孔隙,试样整体结构出现了一定程度的松散,内部胶状物质散落程度加大,并生成次生矿物小颗粒,促使原生裂隙发育和新裂隙的产生,煌斑岩的内部体系受到破坏,力学特性发生改变,使得煌斑岩的硬度降低;煌斑岩试样随着微波功率和照射时间的增加,温度逐步升高,幅值逐渐减小。In order to explore the mechanical properties and microstructure changes of lamprophyre after microwave irradiation with different power,SEM was used to analyze the changes of microcracks in lamprophyre samples before and after irradiation,and the compressive strength and tensile strength of lamprophyre were analyzed by uniaxial and triaxial presses.COMSOL numerical simulation software was used to establish a rock homogeneity model to verify the experimental results.The results show that microwaves can accelerate crack propagation and the generation of new cracks.After microwave irradiation,the uniaxial tensile strength and uniaxial compressive strength of the sample decreased,the surface roughness of the sample increased,and fine particles and pores appeared.The overall structure of the sample was loose to a certain extent,and the internal micellar materials were scattered more,and secondary mineral particles were generated,which promoted the development of primary cracks and new cracks,and the internal system of lamprophyre was damaged.The hardness of lamprophyre decreases due to the change of mechanical properties.With the increase of microwave power and irradiation time,the temperature of lamprophyre samples increased gradually,and the amplitude decreased gradually.

关 键 词：煌斑岩 微波 力学特性 

分 类 号：TD315[矿业工程—矿井建设] TU452[建筑科学—岩土工程]