复杂地层钻孔灌注桩后注浆施工技术应用研究  

Application of Post Grouting Construction Technology for Drilling and Grouting Piles in Complex Geological Formations

作　　者：王绍辉 王海鑫 Wang Shaohui;Wang Haixin(China Railway 2nd Bureau Group 1st Engineering Co.,Ltd.,Guiyang,Guizhou 550000)

机构地区：[1]中铁二局第一工程有限公司,贵州贵阳550000

出　　处：《现代工程科技》2024年第1期25-28,共4页Modern Engineering Technology

摘　　要：钻孔灌注桩因其施工容易、对地层适应性强和造价经济等优点,在各类建筑工程中应用广泛。以济南地铁位里庄车辆段桩基工程为案例基础,对于北方城市普遍存在的特殊软弱地质土层,做好桩端桩侧后注浆工艺质量控制措施,经后注浆与普通未注浆桩基试验应用效果数据对比得出,采用桩基注浆施工技术,可充分消除桩底砂土液化,使桩侧摩阻力形成一个结石体来抵消地下水位变化引起的桩侧负摩阻力影响,很好地解决了黄河冲积平原地区地质地层复杂持力层较差、受地下水丰富影响较大区域钻孔灌注桩单桩承载力远低于设计预估值的技术难题,为今后类似工程施工建设提供借鉴。Drilled cast-in-place piles are widely used in various construction projects due to their advantages such as easy construction,strong adaptability to strata,and economic cost.Based on the pile foundation project of Weilizhuang Depot of Jinan Metro as a case study,for the special weak geological soil layer commonly found in northern cities,quality control measures for post grouting technology at the pile end and side were taken.After comparing the application effect data of post grouting and ordinary non grouting pile foundation tests,it was found that using pile foundation grouting construction technology can fully eliminate liquefaction of sand soil at the pile bottom,The formation of a stone body to counteract the negative frictional resistance on the pile side caused by changes in groundwater level effectively solves the technical problem of the complex geological strata and poor bearing layer in the Yellow River alluvial plain,as well as the fact that the single pile bearing capacity of bored piles in areas greatly affected by groundwater abundance is far lower than the design estimate.This provides a reference for similar engineering construction in the future.

关 键 词：钻孔灌注桩 单桩承载力 后注浆 措施控制 

分 类 号：TU753.3[建筑科学—建筑技术科学] TU712.3