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微波辅助机械破岩是微波加热技术和机械破岩技术相结合的一种混合型破岩方法。岩石内不同矿物成分对微波能具有不同的吸收特性,各矿物不同的热膨胀产生的内应力使岩石内发生沿晶断裂和穿晶断裂,使试样产生损伤和微裂纹,这会引起岩石强度的降低。辐射功率和辐射时间是影响岩石力学特性的重要参数,一定功率的微波辐射处理后,试样的点荷载强度、单轴抗压强度和抗拉强度发生显著降低,微波功率越高,辐射时间越长,对试样强度的折减效果越明显。数值研究结果与试验研究结果基本一致,增加功率的同时降低辐射时间对试样强度折减具有更好的效果。岩石点荷载强度、单轴抗压强度和抗拉强度的降低能够显著提高机械破岩设备刀具的侵入率和刀具寿命,解决机械刀具的磨损问题。微波辅助机械破岩对钻孔、TBM掘进和实现金属矿矿岩连续开采都具有重要影响作用。
Microwave assisted mechanical rock breaking is a hybrid rock breaking method combining microwave heating with mechanical rock breaking. The different minerals in the rock have different absorption characteristics to the microwave energy. The internal stress generated by different thermal expansions in the rock causes intergranular and transgranular fracture in the rock, resulting in damage and micro-cracks on the sample, which may cause the rock strength reduce. Radiation power and radiation time are important parameters that affect the rock mechanical properties. After a certain power of microwave radiation treatment, the point load strength, uniaxial compressive strength and tensile strength of the sample significantly reduce, the higher the microwave power, the longer the radiation time Long, the reduction of the strength of the sample the more obvious. The numerical results are basically consistent with the experimental results. It is concluded that increasing the power and reducing the radiation time have better effect on the strength reduction of the sample. Rock point load strength, uniaxial compressive strength and tensile strength can significantly reduce the penetration rate of mechanical rock breaking equipment and tool life, to solve the problem of mechanical tool wear. Microwave-assisted mechanical rock breaking has important influence on drilling, TBM tunneling and continuous mining of metal ore rock.