优质膨润土泥浆在大直径深桩基工程中的应用

为解决在澳门美高梅金殿超濠博彩场及酒店项目桩基工程中大直径深护筒无法回收的难题,笔者在分析港澳地区灌注桩传统工艺缺陷的基础上,采用具有预处理能力的优质膨润土泥浆.施工实践表明,2#配方泥浆能有效的保持桩孔稳定性,桩孔的平均充盈系数为1.0794;改善了钻进泥浆的性能,使泥浆的重复利用率提高到45.33%,泥浆废弃率仅为2.38%;降低了工程成本,减小了对环境的影响.同时,为钻孔灌注桩施工总结了各个阶段泥浆性能标准.

APPLICATION OF HIGH-PERFORMANCE BENTONITE SLURRY IN LARGE DIAMETER AND DEEP BORED PILE ENGINEERING

High quality bentonite slurry is adopted to prevent the possibility of cost caused by lost casing according to the traditional construction method of bored pile in MGM JV casino & hotel development Macao.The new method is also introduced.It demonstrates that Formula 2 slurry can effectively keep the stability of pile shaft,which minishes the average filling coefficient to 1.0794.Formula 2 slurry can improve the performance of drilling fluid,which increases the reuse ratio of slurry to 45.% and decreases the discarding ratio to 2.8%.So,it can reduce cost and the impact on environment.And also,we conclude a table of recommended performance characters of pile foundation slurry in different phases of construction.