青藏铁路路基浅地表热状态动态监测初步分析

DYNAMIC MONITORING OF THERMAL STATE FOR SHALLOW GROUND IN QINGHAI-TIBET RAILWAY EMBANKMENT

通过北麓河试验段天然地面和青藏铁路路基浅地面的土壤热通量和温度动态监测资料,主要论述了天然条件下多年冻土浅地表地温特征及其上部活动层内热变化规律以及修筑铁路路基后多年冻土及其上部活动层的动态变化规律,通过对比分析天然地面与铁路路基中冻土热状态的动态变化,给出了工程影响条件下冻土热状态的相对变化,并分析了动态变化的主要影响因素。

The temperature and heat flux of shallow soil ground in Qinghai-Tibet railway embankment is dynamically monitored in Beiluhe testing measuring field. Based on the testing data,the temperature features of shallow ground in natural permafrost condition and heat variation features in the upper active layer are discussed. Dynamic variational rule of uppe active layer of permafrost after the railway embankment is introduced. Based on dynamic variational rule of the ground and the embankment,the relative variation of thermal state of permafrost induced by engineering activity is clarified and the primary effect factors are discussed.