微波加热路径对硬岩破碎效果影响试验研究-岩石力学与工程学报.pdfVIP

第36 卷 第X 期 岩石力学与工程学报 Vol.36 No.X 2017 年X 月 Chinese Journal of Rock Mechanics and Engineering XXX ，2017 微波加热路径对硬岩破碎效果影响试验研究 李元辉，卢高明，张希巍 (东北大学深部金属矿山安全开采教育部重点实验室，辽宁 沈阳 110819) 摘要：不同的微波加热方式会对岩石产生不同的加热效果，功率和时间是影响破岩效果的两个重要参数。对立方 体和标准圆柱形玄武岩试样进行了3 种加热路径下的微波辐射试验，并对辐射前后的试样进行了P 波波速和单轴 压缩强度测试。结果表明，当试样内产生的热应力先超过岩石的强度极限时，试样就会崩开破坏；当试样温度先 达到岩石熔点时，试样以熔化为主。采用高功率微波连续加热岩石，试样在较短时间、较低温度就发生崩开破坏， 试样在崩开前波速和单轴压缩强度发生了显著降低，且功率越高，试样崩开的时间越短，波速和强度折减的越快。 因此，采用高功率微波连续辐射岩石，借助于其产生的热应力使岩石崩开破碎的特点，可显著降低岩石破碎时的 能量消耗，这对于微波单独应用于开采中的破碎工艺及辅助机械破岩掘进等具有重要意义。 关键词：微波辅助破岩；加热路径；硬岩；热应力；强度折减 中图分类号：TU 231 文献标识码：A 文章编号：1000 –6915(2017)00 –0000 –00 The influence of heating path on the effect of hard rock fragmentation using microwave assisted method LI Yuanhui ，LU Gaoming ，ZHANG Xiwei (Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines ，Northeastern University ，Shenyang 110819 ，China) Abstract ：It will occur different heating effects with different heating paths. Power and heating time are the important parameters to influence the effects of the rock fragmentation. The microwave heating tests were conducted on cubic and cylindrical basalt samples under three different heating paths and P-wave velocity and UCS were measured before and after microwave treatment. It demonstrates that the sample will burst into fragment when the thermal stress within the sample exceeds the ultimate strength of the rock ；while the sample mainly be melt if the temperature of the sample exceeds the melting point prior. When used a high microwave power ，the sample burst into fragment at less time