抛石护坡保护公路下退化性多年冻土效果现场监测研究

为了验证抛碎石护坡保护退化性多年冻土区公路下多年冻土效果,2003年在214国道建立了抛碎石护坡试验路,并建立了系统的地温监测断面.监测结果表明,抛碎石护坡可以在夏季对路基土体起到保温作用,在冬季可以降低路基土体温度;采用抛碎石护坡措施断面各孔位多年冻土地温保持稳定,多年冻土人为上限也比较稳定;采取抛碎石护坡措施以后,可以降低路基周边温度,增强路基的热稳定性,有利于保护或延缓多年冻土退化,减轻公路路基病害程度.

Study on In-situ Monitoring of Effect of Degenerative Permafrost Protected by Crushed Rock Revetment

To validate the permafrost protection effect by crushed rock revetment in degenerative permafrost regions, a 2 km long test road with crushed rock revetment was constructed along national road 214 in 2003, and ground temperature monitoring sections were also constructed.The monitoring result shows that (1) the crushed rock revetment has the thermal insulation effect on the embankment soils in summer and could lower the temperature of the embankment soils in winter; (2) the ground temperature of positions on different sections of roadbed with crushed rock revetment and the artificial permafrost table could be kept stable; (3) the crushed rock revetment could lower the roadbed surrounding temperature and improve the roadbed thermal stability.Thus the crushed rock revetment could benefit the permafrost protection and decrease the roadbed diseases.