堆石混凝土坝技术网-拱坝坝体防渗

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防渗层方式	基本要求	特点
高自密实性能混凝土一体化防渗	防渗层厚度宜为0.3m~1.0m（来源：SL 678-2014）、0.5m~1.0m（来源：NB/T 10077-2018）和0.5m~0.8m（来源：DB52/T 1545-2020）；防渗层宜配置防裂钢筋网	高自密实性能混凝土具有优良的抗渗性能，试验表明C20高自密实性能混凝土的抗渗等级可以达到W20以上。
高自密实性能混凝土一体化防渗		与坝体混凝土一体化浇筑，无需单独支立模板，简化施工工艺。
坝体自身防渗（不设防渗层）	当坝体坝高小于30m时，可采用坝体自身防渗	不设防渗层，坝体构造和施工工艺简单
坝体自身防渗（不设防渗层）	当坝体坝高小于30m时，可采用坝体自身防渗	需要对坝体与地界的连接进行防渗设计
常态混凝土防渗	单独支立模板；防渗层和堆石混凝土可埋设插筋	需单独支立模板，施工工艺复杂

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