高压喷射注浆技术用于高铁桥梁纠偏的可行性分析  

Feasibility Analysis of High Pressure Jet Grouting Technology for Bridge Rectification

作　　者：朱江江 ZHU Jiangjiang(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 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：《铁道标准设计》2024年第8期92-98,107,共8页Railway Standard Design

基　　金：中国铁建股份有限公司科研计划课题(17-C39)。

摘　　要：我国高铁在长期运营过程中,受周边环境变化及人类工程活动等多种因素影响,部分线路桥梁地段出现了较大的横向偏移,严重影响列车正常安全运营,亟需进行纠偏整治。在分析高压喷射注浆桥梁纠偏原理基础上,建立桥梁纠偏理论计算模型,基于弹性地基梁理论,推导高压喷射注浆纠偏情况下,基桩挠度、转角、弯矩和剪力的微分方程,以及桥墩顶部位移计算解析式;通过对比桥墩顶部位移计算值与线路实际偏移量,分析高压喷射注浆技术用于桥梁纠偏的可行性,并以现场典型工程案例纠偏效果进行验证。研究结果表明:桥墩顶部位移与地层土体地基系数和高压喷射注浆产生的超孔隙水压力有关,当土体地基系数和超孔隙水压力分别取1 MPa/m和80.3 kPa时,桥墩顶部的理论计算位移为81.8 mm,远大于常见运营高铁无砟轨道线路实际偏移量;采用某高铁松江特大桥桥梁纠偏工程中,现场实测超孔隙水压力均值30.4 kPa计算的桥墩顶部位移为6.4~31.0 mm,其均值也大于线路最大偏移量18.2 mm,表明高压喷射注浆技术用于桥梁纠偏理论上可行;纠偏完成后桥梁及轨道结构状态稳定,线路线形平顺,恢复常速运营多年未见异常,理论和实践证明采用高压喷射注浆方式进行桥梁纠偏是一项切实可行的技术措施。During the long-term operation of high-speed railway in our country,affected by various factors such as surrounding environment changes and human engineering activities,large lateral deviation occurs in some line bridge sections,which seriously affects the normal and safe operation of the train and needs to be rectified urgently.Based on the analysis of the principle of bridge rectification by high pressure jet grouting,the theoretical calculation model of bridge rectification is established,and the differential equations of pile deflection,rotation angle,bending moment and shear force under the high pressure jet grouting rectification mode and the analytical formula of pier top displacement are deduced based on the elastic foundation beam theory.Then,by comparing the calculated displacement at the top of the pier with the actual offset of the line,the feasibility of high pressure jet grouting technology for bridge rectification is analyzed,and the rectification effect is verified by typical engineering cases on site.Research shows that the top displacement of pier is related to foundation coefficient and excess pore water pressure generated by high pressure jet grouting;when foundation coefficient and excess pore water pressure take 1 MPa/m and 80.3 kPa respectively,the top theoretical calculated displacement of pier is 81.8 mm,which is much larger than the actual deviation of ballastless track line of common high speed railway;In the bridge rectification project of a high speed railway Songjiang Grand Bridge,the displacement at the top of the pier calculated by the average value of the measured excess pore water pressure 30.4 kPa is 6.4~31.0 mm,which is also greater than the maximum deviation 18.2 mm of the line,indicating that the high pressure jet grouting technology is feasible for bridge rectification theoretically;After rectification construction,the bridge and track structure are stable,the line alignment is smooth,and there is no abnormality in the normal speed operation for many years.The theory and pra

关 键 词：高速铁路 铁路桥梁 桥梁纠偏 高压喷射注浆技术 理论计算模型 弹性地基梁 可行性分析 

分 类 号：U216[交通运输工程—道路与铁道工程] U238[建筑科学—桥梁与隧道工程] U441.7