Microwave fracturing has a great potential in assisting the breakage of hard rocks using impact hammers by inducing artificial cracks and downgrading the rock mass quality. In this article, the techno-economy of microwave-assisted impact hammer breakage of hard rocks was investigated. Microwave heating tests of 50-cm cubic biotite diorite blocks were carried out, followed by temperature measurement, ultrasonic velocity tests, Schmidt hammer rebound tests and rock breakage tests. The fracturing characteristics, the interaction between the radiation locations and the rock breaking by impact hammer were comprehensively investigated. The results show that the microwave system is efficient in fracturing the diorite. Cracks generated by the subsequent radiation tend to develop toward the centre of, or the cracks generated by, the previous radiation. Cracks produced by the previous radiations can be widened and extended by a following radiation. The maximum length and width of crack increase with the increase of the microwave power and heating time. Rock breakage tests demonstrate that microwave treatment greatly weakens the specimens and improves the efficiency of rock breaking by impact hammer. It is technologically feasible and economically viable to conduct microwave-assisted rock breakage by impact hammers.

微波压裂在通过诱导人工裂缝和降低岩体质量来帮助使用冲击锤破碎硬岩方面具有巨大的潜力。本文对微波辅助冲击锤破碎硬岩的技术经济性进行了研究。对50cm立方黑云母闪长岩块进行微波加热试验，随后进行温度测量、超声速度试验、施密特锤回弹试验和岩石破碎试验。对冲击锤压裂特性、辐射部位与破岩的相互作用进行了综合研究。结果表明，微波系统对闪长岩的压裂是有效的。随后的辐射产生的裂纹倾向于向先前辐射的中心或由先前辐射产生的裂纹发展。先前辐射产生的裂缝可以通过后续辐射扩大和扩展。裂纹的最大长度和宽度随着微波功率和加热时间的增加而增加。破岩试验表明，微波处理大大削弱了试样，提高了冲击锤破岩的效率。通过冲击锤进行微波辅助岩石破碎在技术上和经济上是可行的。