季节性冻土地区保温护道路基温度场数值模拟

A Numerical Simulation of Temperature Field of Insulating Berm Roadbed in Seasonally Frozen Regions

研究路基及周围土体温度的分布规律是分析季节性冻土地区路基稳定性的重要基础,结合哈齐客专DK221+150断面3 a的现场监测数据,分析了天然地表及路基不同位置的地温分布规律;建立温度场的仿真模型,研究温度沿深度方向的变化规律;利用实测数据验证模型,分析保温护道高度对路基温度场的影响。现场监测和模拟计算结果表明:护道对路基的边坡下部和坡脚处影响较大,能够有效减小冻深,但对路基中心的温度场影响不大。

To analyze the road stability in seasonally frozen regions,it is important to research on the distribution law of temperature concerning the roadbed and its surrounding soil. Based on the monitoring data of DK221 + 150 section of Harbin-Qi Qihar passenger railway line in the past three years,this thesis first analyzes temperature distribution law of natural surface and roadbed in different positions. Secondly,a numerical model of unsteady temperature filed was established to study the distribution law of roadbed temperature as the depth vary.Further,the author studied on the influence of insulating berm on the roadbed temperature filed if the heights of insulating berm changes. As a conclusion,the berm of the slope protection and slope toe of subgrade has great influence,it can effectively reduce the depth of freezing,but has little effect on the temperature of the center of the subgrade.