基于温度⁃荷载耦 合 应 力 的 加 热 融 雪 道 面临界加热温度研究

Heating snow-melting technology has the advantages of high efficiency, thoroughness, and environmental protection. This technology has been widely concerned in the field of highway pavements, airport pavement for snow removal. Nowadays, researches on heating snowmelt pavement mainly focus on snowmelt performance, while researches on pavement stress characteristics under the combined action of internal high temperature and external loads are insufficient, so the safety during traffic operation can’t be guaranteed. In this work, a three-dimensional transient temperature-load coupling numerical model was established and then verified based on the measured data of a full-scale heating snowmelt pavement test platform. The temperature stress and load stress distribution of the heating snowmelt pavement were studied. The variation law of pavement maximum temperature stress during the heating process was revealed. The maximum stress of pavement with various environmental conditions, pipeline layouts, heating temperatures, and load types were proposed. The critical heating temperature with various design and weather parameters was determined by comparing the maximum stress with the concrete material strength. The findings show that there is significant pavement temperature stress during the initial heating stage, compressive stress near the pipeline, and tensile stress between the pipelines or on the pavement surface. The maximum compressive stress occurs near the pipe wall, and the maximum tensile stress appears between two pipes. The maximum load tensile stress occurs at pavement bottom, and the maximum load compressive stress appears at pavement surface. Compressive stress occurs directly below the wheel load, and tensile stress occurs at the edge of the wheel load. When temperature stress and load stress are coupled, the stress on the heating snowmelt pavement is greater, and temperature stress paly a dominate role. To ensure the safety of heating snowmelt pavement, the critical heating temperature under different air temperatures and pipe layouts shall be controlled within the range from 13℃ to 57℃.