DAI J, LIU B Y, YANG Q Q,et al.Damage and dynamic characteristics of basalt under single-sided microwave irradiation[J].Journal of Henan Polytechnic University(Natural Science) ,2026,45(4):95-104.

doi:10.16186/j.cnki.1673-9787.2024080035

Received:2024/08/02

Revised:2024/10/08

Published:2026/06/17

Damage and dynamic characteristics of basalt under single-sided microwave irradiation

Dai Jun, Liu Boyuan, Yang Qingqing

Faculty of Architecture and Civil Engineering，Xi’an University of Science and Technology，Xi’an 710054， Shaanxi， China

Abstract: Objectives The current indoor experiments on microwave-assisted mechanical rock breaking typically involve placing the sample directly in the microwave cavity for full exposure. However， this approach does not align with the actual construction scenario where rocks exposed to microwaves only receive single-sided irradiation. Therefore， it is necessary to conduct indoor experiments that simulate the actual engineering condition where the irradiated rock is only exposed on one side.  Methods In this study， basalt was wrapped in copper foil to modify the traditional experimental method. The study examined the heating characteristics， P-wave velocity，and damage variables of basalt under single-sided irradiation with different irradiation parameters. Additionally， the dynamic properties of basalt after single-sided irradiation were investigated using the SHPB （split Hopkinson pressure bar） system.  Results The results showed that after conducting microwave irradiation experiments with the improved method， the thermal images of the samples differed significantly from those obtained using the traditional method. The temperature difference became more pronounced with decreasing sample height. With different irradiation times， the rate of temperature increase on the upper surface of the copper-wrapped rock gradually approached a linear trend as the power increased. The side temperature， from top to bottom，first increased rapidly， then gradually decreased， and finally leveled off. The difference in P-wave velocity increased with  increasing power under constant irradiation time. The damage variable increased with the increasing irradiation time and power. When the microwave irradiation energy was the same，the dynamic strength of the rock decreased more with higher irradiation power. The fragmentation size at the unwrapped end of the sample was significantly smaller than that at the wrapped end， with a more obvious size gradation， resembling the rock damage observed in actual construction scenarios.  Conclusions The results of the improved microwave and dynamic experiments indicate that the improved method is closer to real-world conditions compared to traditional methods

Key words:single-sided irradiation;temperature analysis;basalt;damage variable;mechanical property;Split-Hopkinson Pressure Bar