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优质路基填料缺乏是上海地区公路建设面临的严峻问题,为了避免取土对耕地、农田的破坏,长江口的细砂作为替代材料得到较为广泛的应用。细砂路堤技术的推广应用对于提高道路工程建设水平、保护耕地、保护生态环境意义重大。但是天然砂为散粒体材料,其力学性能与传统路堤填料有较大差异,目前在填砂路堤的应用上主要存在力学行为认识不足等问题。为此通过强度折减法与快速拉格朗日法相结合的手段,从滑动面形态与安全系数两个方面对细砂路堤进行稳定性分析。分析中考虑边坡坡比、路基高度、包边土有无及厚度等部分的几何参数和材料参数等,并通过以上分析给出细砂路基适宜结构体系设计相关建议。
The lack of high-quality subgrade filler is a serious problem in highway construction in Shanghai. In order to avoid soil damage to farmland and farmland, fine sand in Changjiang Estuary is widely used as an alternative material. The popularization and application of fine sand embankment technology is of great significance for improving the level of road construction, protecting cultivated land and protecting the ecological environment. However, the natural sand is bulk material, and its mechanical properties are quite different from the traditional embankment packing. At present, the application of sand filling embankment is mainly lack of understanding of mechanical behavior. Therefore, the stability of fine sand embankment is analyzed from the aspects of sliding surface morphology and safety factor through the combination of strength reduction method and fast Lagrangian method. In the analysis, the geometrical parameters and material parameters such as slope slope ratio, subgrade height, the presence and absence of the edge of the margin, and other parameters are considered. Based on the above analysis, some suggestions are given for the design of appropriate structural system of fine sand subgrade.