| 刘睦峰.复杂岩层大直径嵌岩桩钻进技术[J].地质与勘探,2009,45(5):621-626 |
| 复杂岩层大直径嵌岩桩钻进技术 |
| Research on Drilling Technology of Large DiameterRock-embedded pile in Complex Rock |
| 投稿时间：2009-05-20 修订日期：2009-08-30 |
| DOI： |
| 中文关键词: 复杂岩层 大直径 嵌岩桩 钻进技术 |
| 英文关键词: complex rock,large diameter,rock-embedded pile,drilling technology |
| 基金项目: |
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| 摘要点击次数: 2169 |
| 全文下载次数: 1932 |
| 中文摘要: |
| [摘要]在软硬互叠产状变化大且岩层坡面偏陡的地层中进行大直径嵌岩桩基础施工是当今岩
土钻掘工程界面临的主要技术难题之一。结合某桥址的工程地质特征,分析了滚刀的碎岩机理和滚刀
的分布规律,采用大扭矩动力头液压钻机配组合式滚刀钻头钻进的施工工艺,改进了常规的气举反循环
排渣方式,总结出回次钻进技术方法,探索出一套适应该地层的泥浆性能指标、钻压、转速和小时进尺等
工艺技术参数值;研究发现泥浆对钻具的浮力影响是不能忽略的,提出了一种行之有效简易确定钻压的
方法,这些技术参数和工艺方法对类似工程的施工具有一定的指导意义。 |
| 英文摘要: |
| Abstract:In currently geotechnical engineering,it is facing one of the most important technical problem about drilling technology of large diameter
bored-pile in alternating hard and soft rock which obliquity change large and steep. According to engineering geological characteristics of one bridge, this
paper analysed mechanism of hob broken-rock and its distribution, adopt high torque hydraulic power drill and construction technology of combined drill,
and improved the conventional air-lift reverse technique, has summarized back and forth drilling technical method, explored a set technology parameter
values such as slurry properties,drilling pressure, rotational speed, and hours of footage. Also it thought there might not ignore that slurry have some buoy鄄
ant force with the drill-tool in the construction of large diameter and super depth bored-pile, and presented a useful way which could calculate simply the
drill-pressure, those parameters and processes will be something importance in future project practice. |
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