超厚回填土桩身防水流冲刷混凝土配制技术研究

Research on the Technology of Concrete Preparation for the Pile Body Anti Current Scour in Ultra-deep Backfill Soil Area

目前桩基础被广泛使用,为获得高回填多雨区混凝土桩基较好的抗冲刷能力,以贵阳龙洞堡机场项目为依托,采用室内试验、模型模拟等方式,从桩基混凝土自身配合比方面开展研究,通过添加絮凝剂、硅灰、超缓凝剂等外加剂,成功研究了一种适应超长桩混凝土浇筑工艺要求、满足该复杂地层抗水流冲刷的混凝土。该混凝土的研制,能够有效提高该复杂地层桩基施工的安全和质量。

At present,pile foundation is widely used.In order to obtain better anti scour ability of concrete pile foundation in high backfill and rainy area,based on Guiyang Longdongbao airport project,this paper studies the mixing ratio of pile foundation concrete by means of indoor test and model simulation.By adding flocculant,silica fume,super retarder and other admixtures,it has successfully researched and designed a kind of concrete which suit for the requirement of concrete casting and the ability of anti current scour in complex stratum.The research of the concrete can effectively improve the safety and quality of pile foundation construction in this complex stratum.