季节性冰冻地区路基温度场分布规律

摘要

Based on the field data collected from a medium-scale experimental pavement system,temperature distribution characteristic of subgrade in seasonally frozen regions was studied in detail,and the prediction model for subgrade temperature distribution was proposed with regression analysis.Test data illustrated that：The temperature of subgrade changed with time,and it followed cosine distribution;Energy was stored with the heat transfer in subgrade,and it transferred nonlinear with depth.Based on the collected data,the prediction model for subgrade temperature distribution in this area was proposed.The comparison between measured and predicted temperatures indicated that this model had good applicability and accuracy for this area.%为准确掌握路基结构温度场的分布特点和变化规律,以季节性冰冻地区典型道路结构路基温度场一年多的跟踪观测数据为基础,开展了季节性冰冻地区路基温度场分布规律的研究,并利用统计回归方法建立了观测点所在区域路基温度场的预估模型.研究显示：路基温度场分布特性以年为周期呈余弦规律变化,不同深度路基的温度变化存在滞后性;热量在路基结构内的传递过程中伴随能量的衰减,且热量沿深度方向呈非线性传递.夏季温度梯度较小,冬季较大.在此基础上,基于观测数据,运用统计分析法,建立了观测点区域路基温度场预估模型,实测值与预测值的对比表明,该预估模型具有较好的精确性与实用性.