沥青路面温度场的数值模型研究
发布时间：2018-09-14 09:10
【摘要】：研究极端温度条件下沥青路面温度场的数值模型,并预估路面结构任意深度处最不利温度情况,能够为沥青路面的设计提供一定的理论指导。本文以连续2年沥青路面全厚度范围内的温度实测值为数据支撑,分析了高温期、低温期、常温期温度场的变化规律;采用“双试件平板式”热传导试验装置,测试了常用半刚性基层沥青路面材料的导热系数;通过数值回归分析的方法建立了高温时刻和低温时刻温度场在数学意义上的数值模型,分析了沥青路面的热传导机理,并将极端高温时刻和极端低温时刻温度场简化为稳态温度场,建立了热传导意义上的折线式温度场数值模型;对比分析了数值回归模型与折线式温度场模型的精度以及适用性。研究表明,沥青路面的温度呈周期性变化,以日周期变化最为显著,路面温度的变化主要集中于沥青层,基层温度变化较小,底基层温度基本不变;水稳基层的导热系数大致在1.03~1.60W·(m·K)-1之间,沥青面层导热系数在0.70~2.10W·(m·K)-1之间;影响路面材料导热系数的关键内因首要是空隙率,其次为粒径,外因则是温度;沥青路面的热传导通常是瞬态而非稳态,高温和低温时,路面温度场在理论上具有相同的分布规律,只是数值大小有别,分布曲向相反且对称,但高温时瞬态强烈,低温时更趋稳态;路面在极端高温时刻的温度场可以用指数衰减的数值模型来表示,沥青层衰减幅度较大,进入基层后逐渐趋于稳定,温度升高的过程体现了路面温度场从瞬态到稳态的变化过程,极端高温时刻接近稳态的温度场的数值模型可用折线来表示,其斜率与各结构层材料的导热系数有关;相反,极端低温时刻温度场与高温温度场有相同的回归模型,方向相反变为增加;低温期路面温度变化幅度小,且材料导热系数也较小,导热性能弱,热传导更接近于稳态,数值模型可简化为直线。
[Abstract]:Studying the numerical model of asphalt pavement temperature field under extreme temperature and predicting the most unfavorable temperature at any depth of pavement structure can provide certain theoretical guidance for the design of asphalt pavement. Based on the temperature measurements in the range of total thickness of asphalt pavement for 2 consecutive years, this paper analyzes the variation of temperature field in high temperature period, low temperature period and normal temperature period, and adopts the "double test piece plate type" heat conduction test device. The thermal conductivity of asphalt pavement materials of semi-rigid base is tested, the mathematical model of temperature field at high temperature and low temperature is established by numerical regression analysis, and the heat conduction mechanism of asphalt pavement is analyzed. The temperature field of extreme high temperature and extreme low temperature is simplified as steady state temperature field, and the numerical model of broken line temperature field in the sense of heat conduction is established, and the accuracy and applicability of numerical regression model and broken line temperature field model are compared and analyzed. The research shows that the temperature of asphalt pavement changes periodically, with the most significant change in the daily period. The change of pavement temperature is mainly concentrated in asphalt layer, the temperature of base course is small, and the temperature of bottom base is basically unchanged. The thermal conductivity of the water-stabilized base is approximately between 1.03 ~ 1.60W (m K) ~ (-1) and that of the asphalt surface is between 0.70 ~ 2.10W (m K) ~ (-1), the key internal factor affecting the thermal conductivity of pavement material is mainly the porosity, the second is the particle size, the other is the temperature. The heat conduction of asphalt pavement is usually transient rather than steady. At high temperature and low temperature, the temperature field of asphalt pavement has the same distribution law in theory, but the numerical value is different, the distribution is opposite and symmetrical, but the transient state is strong at high temperature. At low temperature, the temperature field of pavement at extreme high temperature can be expressed by numerical model of exponential attenuation. The attenuation amplitude of asphalt layer is larger, and it tends to be stable after entering the base. The process of temperature rise reflects the process of changing from transient to steady state of pavement temperature field. The numerical model of temperature field near steady state at extreme high temperature time can be expressed by broken line, and its slope is related to the thermal conductivity of each structure layer material; on the contrary, The temperature field at the extreme low temperature has the same regression model as the temperature field at the high temperature, and the direction is opposite to that of the temperature field, and the change of pavement temperature is small, the thermal conductivity of the material is also small, the thermal conductivity is weak, and the heat conduction is closer to the steady state. The numerical model can be simplified as a straight line.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.217
本文编号：2242244
[Abstract]:Studying the numerical model of asphalt pavement temperature field under extreme temperature and predicting the most unfavorable temperature at any depth of pavement structure can provide certain theoretical guidance for the design of asphalt pavement. Based on the temperature measurements in the range of total thickness of asphalt pavement for 2 consecutive years, this paper analyzes the variation of temperature field in high temperature period, low temperature period and normal temperature period, and adopts the "double test piece plate type" heat conduction test device. The thermal conductivity of asphalt pavement materials of semi-rigid base is tested, the mathematical model of temperature field at high temperature and low temperature is established by numerical regression analysis, and the heat conduction mechanism of asphalt pavement is analyzed. The temperature field of extreme high temperature and extreme low temperature is simplified as steady state temperature field, and the numerical model of broken line temperature field in the sense of heat conduction is established, and the accuracy and applicability of numerical regression model and broken line temperature field model are compared and analyzed. The research shows that the temperature of asphalt pavement changes periodically, with the most significant change in the daily period. The change of pavement temperature is mainly concentrated in asphalt layer, the temperature of base course is small, and the temperature of bottom base is basically unchanged. The thermal conductivity of the water-stabilized base is approximately between 1.03 ~ 1.60W (m K) ~ (-1) and that of the asphalt surface is between 0.70 ~ 2.10W (m K) ~ (-1), the key internal factor affecting the thermal conductivity of pavement material is mainly the porosity, the second is the particle size, the other is the temperature. The heat conduction of asphalt pavement is usually transient rather than steady. At high temperature and low temperature, the temperature field of asphalt pavement has the same distribution law in theory, but the numerical value is different, the distribution is opposite and symmetrical, but the transient state is strong at high temperature. At low temperature, the temperature field of pavement at extreme high temperature can be expressed by numerical model of exponential attenuation. The attenuation amplitude of asphalt layer is larger, and it tends to be stable after entering the base. The process of temperature rise reflects the process of changing from transient to steady state of pavement temperature field. The numerical model of temperature field near steady state at extreme high temperature time can be expressed by broken line, and its slope is related to the thermal conductivity of each structure layer material; on the contrary, The temperature field at the extreme low temperature has the same regression model as the temperature field at the high temperature, and the direction is opposite to that of the temperature field, and the change of pavement temperature is small, the thermal conductivity of the material is also small, the thermal conductivity is weak, and the heat conduction is closer to the steady state. The numerical model can be simplified as a straight line.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.217
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