保护冻土的保温原理

在多年冻土地区修筑路堤、设置保温层是保护路堤下多年冻土上限不变甚至上升的隔热保温方法,其保温效果取决于隔热层对下部多年冻土年平均地温和温度较差的改变状况,作者阐述了保温方法的工作原理,并依据该原理探讨了最小路堤高度和最大路堤高度存在的可能性及其适用范围,北麓河试验场的观测资料较好地验证了理论探讨。

Principles of Thermal Insulation for Permafrost Preservation

In permafrost regions, the measures of constructing embankment or installing insulation are in common use to keep the permafrost table under embankment unchanged. However, the effect of these measures depends on its adjustment abilities to the mean annual ground temperature and the ground temperature amplitude of permafrost under the embankment. This paper explains the principles of thermal insulation for permafrost preservation. Based on the principles, probability on the existence of maximum and minimum embankment heights and applicability of the thermal insulation are discussed. The principles are well confirmed by the field observation data at Beiluhe test site of Qinghai-Xizang Railway.