注浆微型钢管桩加固地基承载性能试验研究  

Experimental Study on Bearing Capacity of Foundation Reinforced by Grouting Miniature Steel Pipe

作　　者：郭明红 田永焘 罗波 李涛 张晓曦 GUO Minghong;TIAN Yongtao;LUO Bo;LI Tao;ZHANG Xiaoxi(China MCC5 Group Co.,Ltd.,Chengdu,Sichuan610063,China;China Academy of Engineering Physics,Mianyang,Sichuan621000,China;Chengdu Surveying Geotechnical Research Institude Co.,Ltd.of MCC,Chengdu,Sichuan610023,China)

机构地区：[1]中国五冶集团有限公司,四川成都610063 [2]中国工程物理研究院总体工程研究所,四川绵阳621000 [3]中冶成都勘察研究总院有限公司,四川成都610023

出　　处：《施工技术（中英文）》2024年第11期62-68,共7页Construction Technology

基　　金：中国五冶集团有限公司重大课题:微型钢管桩注浆地基加固技术研究与应用。

摘　　要：为探究注浆微型钢管桩加固地基的承载性能,并用于指导现场施工,通过开展注浆微型钢管桩现场试验,探究荷载和深度对桩身轴力、桩身相对位移、桩侧摩阻力的影响规律以及不同桩间距的桩体承载性能差异。结果表明:土体分层会导致相应深度的桩周土体发生变形而出现桩侧负摩阻力;在相同地质条件下,1.5m桩间距的单桩承载力和极限沉降位移分别是2m桩间距的1.25和1.13倍;相同条件下,1.5m桩间距能实现经济成本和加固效果的更优组合。In order to investigate the bearing performance of grouted miniature steel pipe piles for foundation reinforcement and use it to guide the field construction,the field test of grouted miniature steel pipe piles was carried out to investigate the effects of load and depth on the axial force of pile body,the relative displacement of pile body,the friction force on pile side as well as the difference of bearing performance of piles with different pile spacing.The results show that:soil layering will lead to the deformation of the soil around the pile at the corresponding depth and the emergence of negative friction resistance on the pile side;under the same geological conditions,the single pile bearing capacity and ultimate settlement displacement of 1.5m pile spacing are 1.25 and 1.13 times that of the 2m pile spacing,respectively;and under the same conditions,the 1.5m pile spacing can realize a better combination of economic cost and reinforcement effect.

关 键 词：地基 加固 微型桩 侧摩阻力 相对位移 

分 类 号：TU447[建筑科学—岩土工程]