高压喷射注浆纠偏技术关键控制参数探讨  

Exploration on the Key Control Parameters of High Pressure Jet Grouting Rectification Technology

作　　者：陈占[1] 朱江江 彭志鹏[1] 周勇[1] 陈侃[1] CHEN Zhan;ZHU Jiangjiang;PENG Zhipeng;ZHOU Yong;CHEN Kan(China Railway Siyuan Survey and Design Group Co.Ltd,Wuhan,Hubei 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道工程学报》2022年第2期41-45,61,共6页Journal of Railway Engineering Society

基　　金：中国铁建股份有限公司2017年度科研计划课题(17-C39)。

摘　　要：研究目的:大量实践证明采用高压喷射注浆方式进行桥梁纠偏是一条切实可行的技术措施。通过分析地基处理桥梁纠偏原理,建立水泥浆射流冲蚀破坏土体理论模型,基于高压射流理论,以纠偏量最大、回弹量最小、纠偏效果最优为基本求解条件,推导纠偏施工关键控制参数表达式,确定钻杆最佳旋转速度和提升速度,以及水泥浆液喷嘴出口压力和水灰比,并以现场典型工程实际纠偏效果进行验证。研究结论:(1)喷嘴直径一定时,水泥浆液射流功率与喷嘴出口压力的3/2次方成正比,与水泥浆液密度的1/2次方成反比,提高注浆压力可有效增大射流功率,达到较好的纠偏效果;(2)以文中工程实例地层条件,钻杆最佳旋转速度和提升速度分别为25.1 r/min和16.3 cm/min,水泥浆液喷嘴出口压力应为5 MPa,水灰比应控制在0.8∶1.0;(3)采用计算的关键控制参数,在实际工程中取得了良好的纠偏效果,表明所建理论模型和计算参数能用于指导现场实际施工;(4)本研究成果可为地基处理桥梁纠偏提供实用的关键控制参数,实现最优纠偏效果。Research purposes:A large number of practices have proved that it is a feasible technical measure to rectify the deviation of bridge by high pressure jet grouting.Through the analysis of the principle of bridge correction by foundation treatment,the theoretical model of soil erosion and damage by cement slurry jet was established.Based on the high pressure jet theory,taking maximum correction amount and minimum rebound amount,and the best correction effect as the basic solution conditions,the expression of key control parameters of rectification construction was derived,the best rotation and lifting speed of drill pipe,and the outlet pressure and the water-cement ratio of the cement slurry nozzle were determined,and were verified with the actual correction effect of typical project on site.Research conclusions:(1)When the nozzle diameter is fixed,the cement slurry jet power is proportional to the 3/2 power of the nozzle outlet pressure and inversely proportional to the 1/2 power of the cement slurry density,increasing the grouting pressure can effectively increase the jet power,and achieve a better correction effect;(2)Taking the formation conditions of construction case,the best rotation and lifting speed of drill pipe are 25.1 r/min and 16.3 cm/min respectively,the nozzle outlet pressure of the cement slurry should be 5 MPa,and the water-cement ratio should be controlled at 0.8∶1.0;(3)The parameters calculated were used for actual project,a good rectification effect was achieved,which indicates that the theoretical model and calculation parameters established can be used to guide the actual construction;(4)The research results can provide practical parameters for bridge correction by foundation treatment,and achieve the optimal rectification effect.

关 键 词：高速铁路 无砟轨道 桥梁纠偏 高压喷射注浆 关键控制参数 

分 类 号：U216.4[交通运输工程—道路与铁道工程]