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为解决多年冻土地区高等级公路路基稳定性问题,提高路基抵抗因热干扰产生病害的能力,保持冻土路基在设计年限内的热稳定,在对青藏公路已有调控措施应用效果进行分析的基础上,结合多年从事冻土路基科研、设计和施工的经验,提出了青藏高原多年冻土区高等级公路路基选型原则,创新集成了一系列新型调控路基方案,并对其结构型式进行了探讨,给出了分离式路基消除两幅路基相互热干扰的工程措施,修筑了部分实体试验工程。研究表明:单一调控工程措施在实际应用中存在的不足,可以通过结构调整、措施组合等进行优化;窄幅路基条件下适用的调控措施,在高等级公路条件下不能简单套用,要结合高等级公路的特点进行调整设计;对路基体进行水、热综合调控的工程措施是后续研究的重点。该系列新型调控路基工程措施可以为青藏高速等高等级公路建设提供借鉴和支撑。
In order to solve the problem of roadbed stability in high-grade highway in permafrost regions, improve the ability of roadbed to resist diseases caused by thermal interference, maintain the thermal stability of frozen soil subgrade within the design period, and analyze the application effect of the existing regulation measures on Qinghai-Tibet Highway Based on the experience of scientific research, design and construction of permafrost embankment for many years, the principle of roadbed selection for high-grade highway in permafrost region on the Qinghai-Tibet Plateau is proposed. A series of new regulation subgrades are innovatively integrated and the structure type In this paper, the engineering measures to eliminate the mutual thermal interference of two subgrade with the separated subgrade are given, and some physical experimental projects are built. The research shows that the deficiencies of single regulation and control engineering measures in practical application can be optimized through structural adjustment and combination of measures. The applicable regulation and control measures under the condition of narrow subgrade can not be simply applied under the condition of high-grade highways The characteristics of the road to adjust the design of the road base for water, heat and integrated control measures of engineering measures is the focus of follow-up study. This series of new control subgrade engineering measures can provide reference and support for the construction of Qinghai-Tibet high-speed highways.