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青藏高原强烈的环境温度变化和特定的地质条件会引起路堤边坡冻胀融沉,使边坡表层土的强度下降而导致表层流坍甚至边坡滑塌。为保证高原冻土地区人工边坡在一定时期保持稳定,在北麓河厚层地下冰段设计并开展了预制拼装式骨架护坡路基现场实体工程的试验研究。大面积的坡面被骨架护坡分成菱形窗格后,形成的塌滑体的范围和厚度减小,杆件与坡面牢固的连接为一体,增强了边坡的整体性,提高了土体的抗剪切能力,从而加强了土体的抗冲刷能力。此外,两节杆件垂直于坡面搭接,组成菱形窗格的一条边,垂直于坡面方向可以有少许的位移,适当释放窗格内土体的冻胀力。锚杆、杆件实现了以点带线、以线带面的平面防护形式。分析观测资料表明,路堤骨架变形呈现寒季冻胀、暖季融沉的一般特点,且融沉和冻胀变形逐年趋于稳定,骨架护坡对维持边坡坡面稳定起到了较好的作用。
The intense environmental temperature change and specific geological conditions in the Qinghai-Tibet Plateau can cause frost heave and thaw in the embankment slope, which leads to the collapse of the surface layer and even the slope collapse. In order to ensure the stability of artificial slope in the plateau permafrost region for a certain period of time, a pilot study on prefabricated skeleton slope protection embankment on-site physical engineering was designed and carried out in the thick ice section of Beiluhe. After a large slope is divided into rhombus panes by the skeleton slope protection, the range and thickness of the landslide bodies formed are reduced, the connection between the poles and the slope surface is solidified, the slope integrity is enhanced, and the soil Shear resistance, thus strengthening the soil erosion resistance. In addition, the two bars overlap perpendicularly to the slope to form an edge of the diamond-shaped panes, with a slight displacement perpendicular to the slope, so as to properly release the frost heaving force of the soil in the pane. Bolts, rods to achieve a point line, with a line of plane protection form. The analysis of observation data shows that the deformation of embankment skeleton presents the general characteristics of frost heave in winter and thaw in warm season, and thaw settlement and frost heave deformation tended to be stable year by year. Skeletal slope protection played a good role in maintaining slope stability.