微波加热路径对花岗岩力学及能量特性的影响  

Influence of Microwave Heating Path on Mechanical and Energy Properties of Granite

作　　者：李鑫 李庆文[1] 相犇 郭红臣 朱燕文 LI Xin;LI Qingwen;XIANG Ben;GUO Hongchen;ZHU Yanwen(School of Civil and Resource Engineering,University of science and technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083

出　　处：《矿业研究与开发》2022年第11期119-124,共6页Mining Research and Development

基　　金：国家自然科学基金面上项目(52274107);北京科技大学青年教师学科交叉研究项目(FRF-IDRY-GD21-001).

摘　　要：为探究花岗岩在不同微波加热路径下的力学性能和能量特性变化规律,通过控制加热功率和加热时间来设置不同微波加热路径对岩石进行加热。利用能量理论对微波照射后的损伤岩石力学性能进行单轴压缩试验分析,得到岩石在变形破坏过程中的弹性能、耗散能演化规律。结果表明:在微波加热条件下,相比于加热时间,加热功率对岩石造成的损伤更大;岩石热损伤存在损伤突变阈值,当超过该阈值时,损伤急剧增大;不同微波加热路径下岩石内部的能量演化规律大体相同,峰值强度点处总能量和弹性能随着加热功率和加热时间的增加而降低。In order to explore the change rules of mechanical and energy properties of granite under different microwave heating paths,different microwave heating paths were set to heat the rock by controlling heating power and heating time.Based on the energy theory,the mechanical properties of damaged rock after microwave irradiation were analyzed by uniaxial compression tests,and the evolution laws of elastic energy and dissipation energy of rock in the process of deformation and failure were obtained.The results are concluded as follows.Firstly,under the microwave heating condition,compared with the heating time,the heating power causes more damage to the rock.Secondly,the thermal damage of rock has a damage mutation threshold,and the damage will increase sharply when the threshold is exceeded.Thirdly,the energy evolution laws of rocks under different microwave heating paths are basically the same.The total energy and elastic energy at the peak intensity point will decrease with the increase of heating power and heating time.

关 键 词：微波加热路径 力学性能 峰值强度 能量 岩石损伤 

分 类 号：TU45[建筑科学—岩土工程]