桩基施工对冻土区地温影响的试验研究

FIELD OBSERVATION ON RESPONSES OF SOIL TEMPERATURE PROFILE TO CONSTRUCTION OF ENGINEERING PILES IN PERMAFROST

基于现场实测资料 ,分析了多年冻土区地温对工程桩基础施工过程的响应 ,及其在工程结束后的恢复过程。在所观测的特定条件下 ,施工引起观测点地温升高 0 .7℃左右 ;桩体温度在达到最大值后快速下降 ,在 6 0天里 ,桩体温度就从最高值 4℃左右降到了 0℃以下 ;但要使近桩地温恢复到施工以前的水平 ,则可能还需要很长时间。

The responses of soil temperature profile to construction of engineering piles in permafrost are studied by analyzing the in-situ data. For the specific situation observed, it is found that the soil temperature under observation is raised 0.7℃,the temperature in the pile decreases to below 0℃ in 60 days after reaching its maximum value of 4℃, however, it may be a long process for the soil temperature around the pile to recover its original value.