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斜坡地基上的填方路堤已成斜坡地基上的填方路堤已成为山区高速公路路基的主要结构型式。高填方路基的沉降发展规律较一般路基有其自身的特征,即在高路堤荷载作用下,地基土中的应力状态发生变化,从而引起地基变形,出现路基沉降。基于此,本文以新建高速公路典型岩质斜坡地基上高填方路基为研究对象,深入研究了填筑过程中路基沉降变形规律,详细分析了其工后沉降特性。结果表明(1)剖面沉降总体变化较小,与路基填筑压实质量较好有关;(2)总体侧向位移量较小,位移变化呈增大→减小→逐渐趋稳的趋势。(3)路基施工阶段累积沉降较大,工后沉降阶段累积沉降局部有较大发展,但路基整体沉降发展较小。
Filling embankment on slope foundation Fill embankment on slope foundation has become the main structure of highway subgrade in mountainous area. The settlement rule of high embankment has its own characteristic compared with that of ordinary embankment. Under the action of high embankment, the stress state in foundation soil changes, which leads to deformation of foundation and subsidence of roadbed. Based on this, taking the high-filled embankment on the typical rocky slope foundation of the new expressway as the research object, the settlement regulation of the roadbed during the filling process is deeply studied, and the post-construction settlement characteristics are analyzed in detail. The results show that (1) the overall settlement of the section is small, which is closely related to the compaction quality of roadbed filling. (2) The overall lateral displacement is small, the displacement changes from increasing to decreasing, and gradually stabilizing. (3) The cumulative subsidence during the construction phase of the subgrade is large, and the cumulative subsidence at the post-construction subsidence stage has been greatly developed, but the subgrade subsidence has little development.