多舱顶管端头工作井MJS加固技术及其应用效果分析  

Analysis of MJS Reinforcement Technology and Application Effect of the End Well in Multi-cabin Jacking

作　　者：陈志勇 彭焱锋 刘维正[2] 吕伟华[3] Chen Zhiyong;Peng Yanfeng;Liu Weizheng;LüWeihua(China Railway Tunnel Group No.2 Engineering Co.,Ltd.,Sanhe 065201,China;School of Civil Engineering,Central South University,Changsha 410075,China;School of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]中铁隧道集团二处有限公司,河北三河065201 [2]中南大学土木工程学院,湖南长沙410075 [3]南京林业大学土木工程学院,江苏南京210037

出　　处：《市政技术》2024年第7期14-21,共8页Journal of Municipal Technology

基　　金：湖南省建设科技计划项目(KY202108);中铁隧道局集团科技创新计划(隧二研合2020-08)。

摘　　要：顶管工程中对端头工作井局部土体的有效加固是成功实现顶管穿越的重要保障。因此,以紧邻南昌市丹霞路道路的地下综合管廊顶管端头工作井采用MJS工法加固工程为依托,通过现场工况分析、钻孔取芯检测以及数值模拟计算,分析了采用MJS工法对多舱顶管大断面端头工作井的加固作用效果。分析结果表明:大断面多舱顶管端头工作井采用MJS工法桩区分强弱加固区和局部楔形体加固方案完全满足工程安全质量要求,顶管结构下卧既有运营地铁隧道结构工况对周围土体施工扰动控制要求很高,采用该加固方案对控制周边地层位移有显著效果,而且对类似工程的设计施工具有指导性意义。In jacking engineering,the effective reinforcement of the local soil at the end well is an important guarantee for the successful implementation of the crossing project.The reinforcement project by MJS of the end well of the utility tunnel of Danxia road adjacent to Nanchang city are taken as an example.Through on-site condition analysis,drilling core detection,and numerical simulation calculation,the reinforcement effect of the MJS method on the end working well at the large cross-section of multi pipe jacking engineering is analyzed.The results show that the MJS construction method pile is used to distinguish the strong and weak reinforcement areas and the local wedge reinforcement scheme for the multi-cabin large section pipe jacking end shaft fully meet the safety and quality requirements of the project.The existing subway tunnel structure under the pipe jacking project has high requirements for the control of the surrounding soil construction disturbance.But the existing reinforcement scheme has a significant effect on the control of the surrounding stratum displacement.This reinforcement plan has guiding significance for the design and construction of similar projects.

关 键 词：综合管廊 多舱顶管 端头井 MJS加固 数值模拟 

分 类 号：TU990.3[建筑科学—市政工程] U455.4[建筑科学—桥梁与隧道工程]