论文部分内容阅读
冻胀和融沉是影响寒区路基稳定性的两大问题.对于多年冻土到融区过渡段路基,除考虑冻胀和融沉外,还应考虑多年冻土区和融区路基沉降变形差和冻胀变形差问题.根据青藏铁路沱沱河试验段路基在竣工后3a内的现场试验数据,分析了有代表性路基的地温变化、路基基底变形以及整个试验段的冻胀、沉降变形差问题,计算出了多年冻土与融区过渡段路基的合理长度.结果表明:多年冻土与融区过渡地带沉降总变形量相差较大,但从年沉降速率来看,路基不会产生突降,且随着沉降速率逐渐减小,路基趋于稳定;试验段内冻胀量差异不大,不会影响线路平顺度.对于本试验段此类工程地质条件,可以采用允许多年冻土融化原则的工程措施.
Frost heave and thaw sinking are the two major problems that affect the stability of the roadbed in the cold area.For the permafrost transition zone subgrade, in addition to frost heave and thaw settlement, the settlement of the subgrade in the permafrost and thawing area should also be considered Poor and frost heaving deformation.According to the field test data of subgrade of Tuotuohe test section of Qinghai-Tibet Railway in the last 3 years after completion, the paper analyzes the change of ground temperature, the subgrade deformation and the frost heave and settlement deformation of the whole test section The difference between the permafrost and the transition zone of the financial zone is calculated.The results show that there is a big difference between the total deformation of the permafrost zone and the transition zone of the melting zone, And the embankment tends to be stable as the sedimentation rate decreases gradually.The amount of frost heaving in the test section is not much different and will not affect the line smoothness.For the engineering geological conditions in this test section, the permafrost Engineering principles of melting principles.