多年冻土区铁路路基沉降现场监测研究

选取某高原铁路多年冻土典型区段，依托冻土观测桩开展冻土路基沉降监测研究。研究结果表明:2010年～2019年间，受气候及工程影响，该段路基下的原多年水热平衡状态遭到破坏，冻土退化现象非常普遍，路基10年累计沉降量大于0.1 m的测点数占总测点数的17 %；由于左右测桩不同位置的环境细微条件不同，导致沉降量存在差异，但总体趋势基本一致；冻土路基累计沉降量与时间线性关系显著，对未来路基沉降进行预测，提前预防各类病害具有重要意义。

Research on Site Monitoring of Railway Subgrade Settlement in Permafrost Regions

Selecting a typical section of permafrost on a plateau railway, the frozen soil subgrade settlement monitoring research was carried out based on frozen soil observation piles. The research result shows that, from 2010 to 2019, due to the influence of climate and engineering, the water and heat balance of this section of roadbed has been destroyed for many years, and the degradation of frozen soil is very common. The number of measuring points with a cumulative settlement of more than 0.1 m in the 10 years of roadbed accounts for 17 % of the total number of measuring points. Due to the subtle differences in the environment of the different positions of the left and right piles, the settlements are different, but the overall trend is basically the same. The cumulative settlement of the frozen soil roadbed has a significant linear relationship with time, which can predict the future settlement of the roadbed , and it's important to prevent all kinds of diseases in advance.