吴文亮,彭俊霖,李智,等.特厚煤层综放工作面变宽煤柱段巷道掘进期间围岩矿压显现特征分析[J].河南理工大学学报(自然科学版)，doi:10.16186/j.cnki.1673-9787.2023110060.

WU W L,PENG J L,LI Z,et al．Numerical simulation of microwave thermal induction in asphalt mixtures［J］.Journal of Henan Polytechnic University( Natural Science)

doi:10.16186/j.cnki.1673-9787.2023110060.

微波热诱导沥青混合料内部升温机理研究(网络首发)

吴文亮，彭俊霖，李智

（华南理工大学 土木与交通学院，广东 广州510641）

摘要:微波热诱导技术在工程应用中只能依据结构表面温度对诱导效果进行测量与评价。 目的 为解决微波对结构内部诱导作用机理尚未明确的问题， 方法 本研究采用COMSOL有限元数值模拟的方法，通过各项材料的电磁参数计算沥青混合料整体的电磁参数，进行电磁热耦合有限元数值分析，分析微波在正方体试件内部的电场强度分布规律，推断微波对沥青路面结构内部温度变化的诱导机理。结合正方体沥青混合料试件在微波热诱导环境中试件表面温度变化受诱导时间的变化情况加以验证，阐明不同级配的沥青混合料结构内部在微波热诱导环境下的升温规律以及温度分布均匀性。 结果 不同矿料的吸波性能可以通过其耗散能量的能力进行评价，计算表明辉绿岩在微波热诱导作用下拥有相较于其他石料更优异的吸波性能。经过有限元数值模拟，各级配辉绿岩沥青混合料结构内部在动态微波热诱导环境下加热200s，结构整体平均温度达到80℃以上，满足混合料内部细小裂缝的愈合温度需求。 结论 以辉绿岩为骨架的沥青混合料在微波热诱导200s以内即可升温至80℃，满足内部结构裂缝的愈合要求，能够更高效利用微波热诱导愈合技术，防止沥青混合料中的裂缝发展成坑槽、松散等功能性病害。

关键词:微波热诱导；数值仿真；COMSOL；辉绿岩；诱导机理

doi:10.16186/j.cnki.1673-9787.2023110060

基金项目: 国家自然科学基金资助项目(51378223)

收稿日期：2023-11-30

修回日期：2024-02-22

网络首发日期：2024-05-21

Numerical simulation of microwave thermal induction in asphalt mixtures

WU Wenliang, PENG Junlin, LI Zhi

（School of Civil Engineering &Transportation, South China University of Technology, Guangzhou 510641, Guangdong,China）

Abstract: In engineering applications, microwave thermal induction techniques were measured and evaluated based solely on the surface temperature of the structure. Objectives To address the problem of the unknown mechanism of microwave action on the interior, Methods COMSOL finite element simulation was adopted in this study. The electromagnetic parameters of the asphalt mixture as a whole are calculated from the electromagnetic parameters of each material, and the electromagnetic-thermal coupling finite element numerical analysis is carried out. This method can analyze the electric field strength distribution law of microwave inside the square specimen and infer the induction mechanism of microwave on the temperature change inside the asphalt pavement structure. Combined with the square asphalt mixture specimen in the microwave thermal induced environment specimen surface temperature changes by the induction time changes are verified. Finally, it is clarified that the internal temperature of asphalt mixtures with different gradations is uniformly distributed under the microwave thermal induction environment.Ｒesults The wave-absorbing performance of different minerals can be evaluated by their ability to dissipate energy, and the calculation shows that diabase has better wave-absorbing performance than other stone materials under microwave thermal induced action. After finite element numerical simulation, the internal structure of all grades of diabase asphalt mixtures was heated for 200s under the dynamic microwave thermal induced environment, and the overall average temperature of the structure reached more than 80℃, which meets the healing temperature requirements of small cracks inside the mixtures. Conclusions The asphalt mixture with pyroxene as the skeleton can be warmed up to 80°C within 200s of microwave thermal induction, which meets the healing requirements of the internal structural cracks, and can more efficiently utilize the microwave thermal-induced healing technology to prevent the cracks in the asphalt mixture from developing into functional diseases such as potholes and looseness.

Key words: microwave thermal induction；numerical simulation；COMSOL；diabase；induction mechanism