黄土区高压旋喷桩复合地基承载力研究  

Investigate on Bearing Capacity of Loess Subgrade Reinforced by Jet Grouting Pile

作　　者：张举鹏 高鹏远 许晓建 范光辉 葛夏 ZHANG Jupeng;GAO Pengyuan;XU Xiaojian;FAN Guanghui;GE Xia(Gansu Road&Bridge Highway Investment Co.,Ltd.,Lanzhou Gansu 710010,China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang Hebei 050043,China;China Highway Engineering Consultants Corporation,Beijing 100089,China;CHECC Highway Maintenance and Test Technology Co.,Ltd.,Beijing 100089,China;CCCC-SHEC Third Highway Engineering Co.,Ltd.,Xi’an Shaanxi 710016,China)

机构地区：[1]甘肃路桥公路投资有限公司,甘肃兰州710010 [2]石家庄铁道大学道路与铁道工程安全保障教育部重点实验室,河北石家庄050043 [3]中国公路工程咨询集团有限公司,北京100089 [4]中咨公路养护检测技术有限公司,北京100089 [5]中交二公局第三工程有限公司,陕西西安710016

出　　处：《工程质量》2022年第12期35-38,42,共5页Construction Quality

摘　　要：为提升高压旋喷桩加固黄土区涵洞的工后承载力,对高压旋喷桩的成桩原理进行分析。以兰州某公路连接线涵洞旋喷桩复合地基加固为依托,采用现场实测的方法,对该工程3根成桩进行了承载力研究,结果表明:通过提高注浆压力、降低转速及提升速度,3个试验桩单桩复合地基承载力特征值均达到了350 kPa,在最大试验荷载700 kPa下的沉降也控制在85 mm左右,旋喷桩复合地基大大提高了黄土地基的承载能力,研究成果可为黄土路基涵洞基底进行旋喷桩加固的承载力提升效果提供参考。In order to improve the post construction bearing capacity of culvert reinforced by high-pressure jet grouting pile in loess area,the pile forming principle of high-pressure jet grouting pile is analyzed.Based on the reinforcement of composite foundation with jet grouting pile for culvert of a highway connecting line in Lanzhou,the bearing capacity of three piles in the project is studied by field measurement.The results show that the characteristic values of bearing capacity of single pile composite foundation of three test piles reach 350kPa by increasing grouting pressure,reducing rotation speed and lifting speed,and the settlement under the maximum test load of 700kPa is controlled at 85mm The research results can provide a reference for improving the bearing capacity of loess subgrade culvert base reinforced by jet grouting pile.

关 键 词：涵洞工程 复合地基承载力 现场实测 高压旋喷桩 

分 类 号：TU753[建筑科学—建筑技术科学]