姜龙, 王连俊. 2008: 青藏铁路多年冻土区沼泽化斜坡路基稳定性分析. 工程地质学报, 16(2): 239-244.
    引用本文: 姜龙, 王连俊. 2008: 青藏铁路多年冻土区沼泽化斜坡路基稳定性分析. 工程地质学报, 16(2): 239-244.
    JIANG Long, WANG Lianjun. 2008: ANALYSIS AND PREDICTION OF TEMPERATURE AND STABILITY OF SWAMPY AND SLOPE ROADBED IN PERMAFROST REGIONS OF QINGHAI-TIBET RAILWAY. JOURNAL OF ENGINEERING GEOLOGY, 16(2): 239-244.
    Citation: JIANG Long, WANG Lianjun. 2008: ANALYSIS AND PREDICTION OF TEMPERATURE AND STABILITY OF SWAMPY AND SLOPE ROADBED IN PERMAFROST REGIONS OF QINGHAI-TIBET RAILWAY. JOURNAL OF ENGINEERING GEOLOGY, 16(2): 239-244.

    青藏铁路多年冻土区沼泽化斜坡路基稳定性分析

    ANALYSIS AND PREDICTION OF TEMPERATURE AND STABILITY OF SWAMPY AND SLOPE ROADBED IN PERMAFROST REGIONS OF QINGHAI-TIBET RAILWAY

    • 摘要: 青藏铁路多年冻土斜坡段路基稳定性对铁路长期运营具有潜在的威胁,分析评价当前和未来斜坡路基稳定性可指导路基工程的正确设计和施工,从而保证铁路的安全运营。多年冻土地温变化使斜坡路基稳定性分析不同于普通土路基,其冻融交界面位置是制约斜坡路基稳定性的关键所在。通过对安多试验段3a来的地温监测,分析路基地温变化规律,并预测了未来50a内试验段地温的变化趋势,建立了当前和未来条件下的斜坡路基稳定性模型,计算分析了斜坡路基的稳定性。通过上述研究,取得以下认识和结论:(1)铁路路堤的填筑,引起多年冻土温度场重分布;由于坡向不对称和几何不对称,使得地温场存在不对称;(2)依据冻融界面位置和活动层的地温特征将冻土路基划分为4个不同时期,即冬季严寒期(1~2月)、春夏融化活动期(3~8月)、最大融深期(9~10月)及回冻活动期(11~12月);通过计算对比分析,每年最大融深期的稳定性系数最小;(3)数值分析的预测结果表明,20a以后,安多段试验段路基的多年冻土完全退化,在所预测的第10年最大融深期稳定性系数最小。

       

      Abstract: Stability of slope roadbed in the permafrost regions of Qinghai-Tibet railway is a potential threat to the railway long-term operation. Assessment of stability of the current and future slope roadbed can guide the roadbed project to correctly design and construction, thus ensuring to operate the railway safely. Changes of ground temperature of permafrost make the analysis of the slope roadbed stability different from others. The location of the freezing-thawing interface is an all-important constraint of the stability of the slope roadbed. Through monitoring the ground temperature at the Anduo section for three years, the changes of the roadbed ground temperature are analyzed and the change trend of the ground temperature in the next 50 years is predicted. The stability model of the present and future slope roadbed is established and the stability of the slope roadbed is calculated and analyzed. Through these investigations, conclusions can be made as follows: (1)filling the railway embankment makes the permafrost temperature field redistribute; the asymmetry of the slope direction and the geometric asymmetry make the ground temperature field asymmetric; (2)based on the location of the freezing-thawing interface and the ground temperature characteristics of the active layer, the frozen roadbed can be divided into four different times, namely, the severe winter period (January-February), the spring and summer melting active period (March-August), the largest thawing depth period (September-October) and the refreezing active period (November-December); (3)the numerical analysis results show that 20 years later, the permafrost of the Anduo test section roadbed will completely degrade, and the stability coefficient in the largest thawing depth period is the minimum in the forecast 10th year.

       

    /

    返回文章
    返回