隧道多年冻土段隔热层厚度解析计算结果的探讨

发布时间：2018-07-16 16:10

【摘要】：寒区隧道保温层厚度解析计算结果需要根据隧址区气象条件进行修正,通过探究隧道多年冻土段隔热层厚度解析计算结果是否需要修正,以获得隔热层铺设厚度安全、适用的计算方法。基于多层圆筒壁热传导理论,结合由斯蒂芬公式计算得到的围岩最大融化深度,以围岩与初衬之间的温度为0℃作为控制条件,推导了隧道多年冻土段隔热层双层铺设时所需厚度的解析计算公式。进而对该解析方法计算结果存在的误差及来源进行分析,并将该解析方法和有限元数值方法的计算结果进行比较。研究结果表明:隧道多年冻土段隔热层铺设厚度的解析计算结果略大于数值计算结果,其差值在1~2cm左右,在实际工程应用中,考虑到隔热层厚度的规格和工程安全系数,可认为对于隧道多年冻土段,隔热层铺设厚度解析计算方法是合理可行的。
[Abstract]:The analytical calculation results of the insulation thickness of the tunnel in cold region need to be revised according to the meteorological conditions of the tunnel site. Whether the analytical calculation result of the insulation thickness of the permafrost section of the tunnel needs to be revised or not is explored to obtain the safety of the laying thickness of the insulation layer. Applicable method of calculation Based on the heat conduction theory of multilayer cylinder wall, combined with the maximum melting depth of surrounding rock calculated by Stephen's formula, the temperature between surrounding rock and lining is taken as the control condition. The analytical calculation formula for the thickness of the double layer insulation layer in the permafrost section of the tunnel is derived. Then, the error and source of the analytical method are analyzed, and the calculation results of the analytical method and the finite element method are compared. The results show that the analytical calculation results of the thickness of the insulation layer in the permafrost section of the tunnel are slightly larger than those of the numerical calculation results, and the difference is about 1~2cm. In the practical engineering application, the specification of the thickness of the insulation layer and the engineering safety factor are taken into account. It can be considered that the analytical calculation method of the thickness of the insulation layer is reasonable and feasible for the permafrost section of the tunnel.
【作者单位】：同济大学;云南省交通规划设计研究院;
【基金】：交通部西部交通建设科技项目(20113184901070);交通部西部交通建设科技项目(2011318799740)
【分类号】：U452.11

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