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由于铁路混凝土耐久性要求,铁路路基支挡结构及承载结构使用年限均需按100年设计,从而导致路基支挡工程投资大幅上升。分析混凝土在各种侵蚀环境作用下的机理,依照混凝土保护层厚度及抗渗性是耐久性设计的核心作为优化设计的基础,结合轻型支挡、重力式支挡结构的优点优化重力式支挡结构形式,提出箱式结构挡土墙。箱式结构在满足承载力和耐久性要求时,内部主体材料可不考虑结构外部环境下的侵蚀,从而降低由耐久性设计引起的工程费用。
Due to the durability requirements of railway concrete, the service life of railway subgrade retaining structures and bearing structures needs to be designed according to 100 years, resulting in a substantial increase in investment in subgrade retaining works. The mechanism of concrete under various corrosive environments is analyzed. According to the thickness and impermeability of concrete cover, the core of durability design is the basis of optimal design, and the advantages of light support and gravity support structure are optimized. Structural form, put forward box-type retaining wall. When the box structure meets the requirements of bearing capacity and durability, the internal body material can not erode the external environment of the structure, thereby reducing the engineering cost caused by the durability design.