Monitoring and analysis of the thermal condition of insulation protection roadbed in high-temperature unstable permafrost region
The analysis of ground temperature monitoring data from the road section with thermal insulation pro-tection measure in the high-temperature unstable permafrost region provides valuable insights into the temporal changes in ground temperature under natural conditions and on the left and right shoulders of the roadbed. This study encompasses the examination of mean annual ground layer temperature,heat budget,and permafrost table variations. Furthermore,the influence of climate warming and the sunny-shady slope effect on the thermal state change characteristics at various locations and depths of the roadbed,as well as the differences between these characteristics and the natural site,are also explored. The results of the study indicate that the sunny-shady slope effect on the left and right shoulders is particularly pronounced. Specifically,the maximum thawing depth of permafrost under the left shoulder is found to be twice that of the right roadbed shoulder. The rate of reduction of the maximum thawing depth is five times that of the right shoulder,and the declining rate of the permafrost table under the left shoulder is also 1.5 times that of the right shoulder. These findings suggest that the thermal state of the left and right shoulders is significantly different under the influence of the sunny-shady slope effect. Addi-tionally,the right shoulder,being situated on a shady slope,may have experienced a stabilizing effect on the permafrost due to the presence of the insulation protection. This is evidenced by the fact that the artificial perma-frost table on the right shoulder has been raised. This positive role of the insulation protection in stabilizing the permafrost is crucial for maintaining the integrity of the roadbed in the high-temperature unstable permafrost re-gion. Furthermore,the study reveals that the mean annual ground layer temperature at different locations exhib-its an upward trend. This growth rate gradually decreases with the increase in depth. However,it is observed that near the interface between the roadbed and the natural site on the left shoulder,the temperature growth rate is greater than that at a depth of 2.5 meters. This suggests that in this specific location,the soil layer may be sub-jected to stronger thermal disturbance under the influence of certain factors. To further understand the thermal state changes in the roadbed,a comprehensive analysis of the ground temperature monitoring data is conducted. This analysis involves examining the temporal variations in mean annual ground layer temperature,heat budget,and permafrost table. By comparing these parameters under natural conditions and on the left and right shoulders of the road,valuable insights into the impact of climate warming and the sunny-shady slope effect can be gained. The study also investigates the differences in thermal state change characteristics between the roadbed and the natural site. This includes analyzing the variations in maximum thawing depth and permafrost table de-clining rate. By quantifying these differences,a clearer understanding of the influence of the sunny-shady slope effect on the thermal state of the roadbed can be obtained. Furthermore,the study explores the role of the insulat-ed berm in stabilizing the permafrost on the right shoulder. This involves analyzing the changes in the artificial permafrost table and the declining rate. In conclusion,the analysis of ground temperature monitoring data from the thermal insulation and protection roadbed section in the high-temperature unstable permafrost region provides valuable insights into the temporal changes in ground temperature under natural conditions and on the left and right shoulders of the roadbed. The study highlights the significant influence of the sunny-shady slope effect on the thermal state of the roadbed,particularly on the left shoulder. Additionally,the positive role of the insula-tion protection in stabilizing the permafrost on the right shoulder is emphasized. These findings contribute to a better understanding of the thermal dynamics in the roadbed and provide valuable information for the design and maintenance of roadbed in high-temperature unstable permafrost regions.
万方数据
维普
