微波加热路径对硬岩破碎效果影响试验研究

发布时间：2018-01-19 03:15

本文关键词： 岩石力学微波辅助破岩加热路径硬岩热应力强度折减　出处：《岩石力学与工程学报》2017年06期 　论文类型：期刊论文

【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2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。
[Abstract]:Different microwave heating methods will produce different heating effects on rock. Power and time are two important parameters affecting rock breaking effect. Microwave radiation experiments on cubic and standard cylindrical basalt samples were carried out under three heating paths. The P-wave velocities and uniaxial compressive strength of the samples before and after radiation were measured. The results show that when the thermal stress generated in the sample exceeds the strength limit of the rock first, the specimen will collapse. When the sample temperature first reaches the melting point of the rock, the sample is mainly melted. When the rock is continuously heated by high power microwave, the specimen collapses in a relatively short time and at a lower temperature. The wave velocities and uniaxial compressive strength of the specimens before the breakup obviously decreased, and the higher the power, the shorter the time of breakup and the faster the reduction of the wave velocity and strength. Therefore, the rock was continuously irradiated by high power microwave. With the help of the thermal stress, the energy consumption of rock breakage can be significantly reduced. This is of great significance for microwave alone applied in crushing process and auxiliary mechanical rock breaking driving.
【作者单位】：东北大学深部金属矿山安全开采教育部重点实验室;
【基金】：国家自然科学基金资助项目(51674061) 国家重点研究发展计划(973)项目(2016YFC0801605)~~
【分类号】：TU45
【正文快照】： 1 引言岩石破碎学是采矿工程的基础科学,从岩体中破碎出岩块是采矿作业中经常遇到的最基本、最简单的过程[1]。从广义上讲,所谓的开拓方案和采矿方法便是破碎岩石和维护岩体的稳定性在空间上的布局和时间上的顺序。在采矿生产中破碎岩石和防止岩石破碎这一根本矛盾的不断产

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