巨厚砂层中钻孔灌注桩施工关键技术研究

Study on Construction technology of Bored pile under huge thick Sandy Stratum

针对江苏省南京市河西地区地质特点,通过试成孔试验,确定钻孔灌注桩穿越巨厚砂层时泥浆配比、钻孔机械选择、钻孔施工参数和泥浆循环系统设置。以工程实践为基础,总结了巨厚砂层中钻孔灌注桩施工方法、施工控制的重点和保证成桩质量的具体措施等。

For the geological characteristics of Nanjing Hexi area in Jiangsu Province,the mud ratio,drilling machinery selection,drilling construction parameters and mud circulation system setting for bored pile under huge thick sandy stratum were studied based on pore-forming test.In addition,the construction method,key points of construction control and specific measures to ensure the pile quality of bored pile under huge thick sandy stratum were summarized by practical engineering example.