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通过埋设在青藏铁路路基中两个断面内的6条沉降观测管3 a来的地基沉降变形资料,研究了高原多年冻土区铁路路基的沉降变形特征,分析了填筑铁路路基对下伏多年冻土融化变形的影响。研究表明,由于受到填筑路基时赋存在路基填料内的热量的影响,铁路路基下伏多年冻土上限在施工初期会有一个明显的下移沉降,铁路路基也随之有一个较大幅度的工后下沉变动,随着时间的推移,路基下降速率会逐渐下降,但在短时间内不会停止下来,而且由于太阳辐射和路基边坡形状的影响,路基向阳面与背阴面的变形有较大的差别,且在近南北向展布的路基上表现最为明显。
Through the settlement data of 6 subsidence observation tubes buried in the two sections of the Qinghai-Tibet Railway subgrade in the past three years, the settlement and deformation characteristics of the railway subgrade in the permafrost region are studied, Influence of Frozen Soil Melting Deformation. The research shows that due to the influence of the heat existing in the subgrade fillings during the embankment filling, the upper limit of the permafrost beneath the railway subgrade will have a clear downward settlement at the initial stage of construction, and the railway embankment will also have a relatively large Subsidence changes after work, with the passage of time, the subgrade decline rate will gradually decline, but in a short period of time will not stop, and because of the impact of solar radiation and subgrade slope shape, subgrade deformation to the sun and the shady there Large differences, and the most obvious in the nearly south-north distribution of the roadbed.