印尼软土地区后注浆钻孔灌注桩现场试验研究  

Field Tests Study on Post-Grouting Cast-in-place Bored Piles in Soft Soil Area of Indonesia

作　　者：门青波 乔建伟 夏玉云 马佳仪 邵兵厂 Men Qingbo;Qiao Jianwei;Xia Yuyun;Ma Jiayi;Shao Bingchang(China JIKAN Research Institute of Engineering Investigations and Design Co.,Ltd.,Xi'an 710043,Shaanxi,China;Shaanxi Laboratory for the Property and Treatment of Special Soil and Rock,Xi'an 710043,Shaanxi,China)

机构地区：[1]机械工业勘察设计研究院有限公司,陕西西安710043 [2]陕西省特殊岩土性质与处理重点实验室,陕西西安710043

出　　处：《岩土工程技术》2024年第1期121-126,共6页Geotechnical Engineering Technique

基　　金：陕西省创新能力支撑计划项目(2023-CX-TD-34,2022-KJXX-05,2023-CX-PT-46);国机集团青年科技基金项目(QNJJPY-2022-41,QNJJ-ZD-2022-17);西安市英才计划青年项目(2022XAYC-03)。

摘　　要：后注浆钻孔灌注桩在软土地区工程中应用广泛,但对后注浆灌注桩承载特性的理论研究仍滞后于工程实践。依托印尼软土地区某工程,开展不同桩长普通钻孔灌注桩和后注浆钻孔灌注桩的现场试验。结果表明,后注浆钻孔灌注桩极限承载力是同条件下普通钻孔灌注桩的1.20~1.26倍,后注浆灌注桩的回弹率和弹性变形相应增加;研究区地质条件下后注浆水泥浆液上返高度约为12.4~13.8 m,桩端以下水泥浆下渗深度约为1.3~2.1 m(约为桩径的1.6~2.6倍);后注浆灌注桩水泥浆上返高度以下桩侧和桩端以下岩土层的标贯击数较压浆前均显著提高,后注浆导致的桩侧摩阻力和桩端阻力的提高是钻孔灌注桩承载性能提高的主要因素。研究成果对指导印尼软土地区后注浆设计和施工具有一定的借鉴意义。Post-grouting bored piles are widely used in soft soil engineering in Indonesia,but the theoretical research on the bearing characteristics of post-grouting bored piles still lags behind engineering practice.Based on a project in Indonesia's soft soil region,field tests of bored piles with different pile lengths and post-grouting bored piles were carried out.The results show that the ultimate bearing capacity of post-grouting bored piles is 1.20 to 1.26 times that of bored piles,and the rebound rate and elastic deformation of post-grouting bored piles are correspondingly increased.Under the geological conditions of the study area,the upward flow height of post-grouting cement slurry is 12.4~13.8 m,and the downward penetration depth of cement slurry below the pile tip is 1.3~2.1 m,which is 1.6~2.6 times the pile diameter.The blow counts of the standard penetration test(SPT)of the rock and soil layers below the cement slurry return height of the post-grouting pile and below the pile end are significantly increased compared to those before grouting.The improvement of the pile side friction resistance and pile end resistance caused by post-grouting is the main factor for improving the bearing performance of the bored pile.The research results have reference significance for the design and construction of postgrouting in soft soil areas in Indonesia.

关 键 词：软土 钻孔灌注桩 后注浆 承载性能 静载试验 

分 类 号：TU473.1[建筑科学—结构工程]