青藏铁路含保温夹层路基厚度与地温关系的研究

A Study on the Relationship between Roadbed Thickness With Insulation and Earth Temperature of Qinghai-Tibet Railway

通过对青藏铁路风火山段含有保温夹层的路基建立均匀介质分层纯导热模型并运用分层近似解法求出冻土表层的温度函数,结合Lachenbruch给出的冻土层的理论温度表达式,得到了路基填料层、保温层、地表年平均温度与正弦变化温度的振幅比三者之间的隐式方程,并应用该方程对三者之间的关系进行了分析.

Through the construction of uniform dielectric hierarchy pure heat conduction model of roadbed with insulation in Fenghuo Mountain section of Qinghai-Tibet Railway,combined with the temperature function of permafrost surfaceobtained by hierarchy approximate solution and the theoretical temperature expression of permafrost given by Lunardini,the implicit equation among the packing layer,insulating layer,the annual average surface temperature of roadbed and amplituderelations of sinusoidal variation temperature isobtained.Finally,an analysis of the re-lationship among these three elements is carried out with this equation.