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成层软基路堤的沉降,尤其是工后沉降是公路建设必须关注的问题。通过对成层软基路堤超载预压路段路基施工期、预压期以及路面施工期全过程的分层沉降变形分析,得到:(1)施工期表现出显著的弹性和弹塑性阶段,预压期的沉降与时间符合双曲线关系;(2)深层沉降与深度具有良好的单指数衰减关系,路基填筑的显著影响区深度约11m;(3)施工期的沉降约占总沉降量的60%,预压期约占30%。研究成果对类似高速公路建设具有较好的借鉴意义与工程实用性。
The settlement of layered soft embankment, especially post-construction settlement, must be paid attention to in highway construction. Through the stratification and deformation analysis of the subgrade during the construction of preloading embankment overloading, the preloading period and the whole construction period of the pavement, we get: (1) The stage of construction shows remarkable elasticity and elastoplastic stage, (2) The relationship between deep subsidence and depth has a good single exponential decay, and the depth of significant influence zone of subgrade filling is about 11m. (3) The settlement during the construction period accounts for about 60% of the total subsidence %, Pre-press period accounts for about 30%. The research results have good reference and engineering practicability for similar expressway construction.