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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.

单面微波照射下玄武岩损伤与动力学特性研究

戴俊, 刘博源, 杨清清

西安科技大学 建筑与土木工程学院，陕西 西安 710054

摘要: 目的 针对现有微波辅助机械破岩室内试验多采用试样全面照射方式，与实际工程中微波直接照射区岩石仅能接受单面照射的工况不符的问题，开展符合实际工程条件的单面微波照射室内试验。  方法采用铜箔包裹玄武岩，并对传统试验方法进行改进，探究单面照射条件下，不同照射参数对玄武岩升温特性、纵波波速变化规律和损伤变量演化的影响，并使用SHPB系统对单面照射后玄武岩的动力学性能进行研究。  结果 结果表明，采用经过改进后的试验方法进行微波照射试验后，试样的热成像图像与传统试验方法相比变化较大，受包裹后的试样上部和下部温差较大，高温区主要集中于试件上部，且试件高度越靠下，温度差越明显；不同照射时间下，铜箔包裹后的岩石上表面升温速率随着照射功率增大逐渐趋向线性变化；侧面温度由上至下表现为先迅速上升，后逐渐降低，最后趋于平缓；试样的纵波波速差在照射时间不变的情况下随功率增大而增大；损伤变量随照射时间和功率的增加而增大；微波照射能量相同时，照射功率更大的岩石动态强度折减更多，试样的未包裹端破坏块度明显小于包裹端的破碎块度，且分级明显，与实际施工中受直接照射处岩石破坏情况类似。  结论 与传统试验方法相比，改良后的微波试验和动力学试验结果更接近实际情况。

关键词:单面照射;温度分析;玄武岩;损伤变量;力学特性;SHPB

doi:10.16186/j.cnki.1673-9787.2024080035

基金项目:国家自然科学基金资助项目（51174159）；陕西省自然科学基础研究计划项目（2017JQ5069）；陕西省教育厅专项科学研究基金项目（15JK1471）

收稿日期:2024/08/02

修回日期:2024/10/08

出版日期: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