柴木铁路冻土沼泽湿地地区倾填片石路基的稳定性探讨

冻土沼泽湿地地区铁路路基形式广泛采用倾填片石结构,受全球气候变暖、局域环境变迁等自然因素的影响以及铁路路基的热扰动,铁路沿线的冻土沼泽湿地在加速萎缩,下部多年冻土在加速退化,修筑于其上部的铁路路基呈现出加速失稳的状态。为保证铁路运营安全,并为运营维护与设计提供技术指导,针对冻土沼泽湿地萎缩与倾填片石路基的结构特点,通过稳定性分析,提出采用主动防护的热棒、太阳能制冷技术,并提出了加强防排水、改善地表条件、帮宽、设置护肩及抬高道砟等防护措施。

Study on the Stability of Rubble-filled Railway Subgrade in Permafrost Marshland Region along Chaidaer-Muli Railway

Nowadays the rubble-filled railway subgrade has widely been used in permafrost marshland region. However, influenced by natural factors such as global warming and regional environment changing,also caused by thermal disturbance of railway subgrade,the permafrost marshlands along railways are deteriorating at an accelerative speed; therefore not only the permafrost strata below the marshlands are degenerating quickly but also the railway subgrades built above the marshlands are losing their stability gradually. In order to ensure railway operation safety as well as provide guidance for both the railway subgrade design and the operation maintenance,this paper paid attention to the deterioration characteristics of permafrost marshland and the features of rubble-filled railway subgrade structure. Further on,by means of stability analysis,the paper proposed the active protection methods of using heated bars and solar cooling technologies, and also suggested some protection measures such as enhancing the waterproofing and drainage,improving the condition of earth's surface,widening the subgrade,installing the shoulder retainer,elevating the track ballast and so on.