复合地层超大矩形顶管隧道下穿高铁施工加固技术  

Reinforcement Technology for Super-large Rectangular Pipe Jacking Tunnels Underpassing High-speed Railways in Composite Strata

作　　者：崔光耀 韩驰 麻建飞 宁茂权[3,4] CUI Guangyao;HAN Chi;MA Jianfei;NING Maoquan(School of civil Engineering,North China University of Technology,Beijing 100144,China;School of civil engineering,Beijing Jiaotong University,Beijing 100044,China;China Railway Siyuan Survery and Design Group Co.,Ltd.,Wuhan 430064,China;Haixia Traffic Engineering Design Co.,Ltd.,Fuzhou 350004,China)

机构地区：[1]北方工业大学土木工程学院,北京100144 [2]北京交通大学土木建筑工程学院,北京100044 [3]中铁第四勘察设计院集团有限公司,湖北武汉430064 [4]海峡(福建)交通工程设计有限公司,福建福州350004

出　　处：《华北水利水电大学学报(自然科学版)》2025年第2期92-101,共10页Journal of North China University of Water Resources and Electric Power:Natural Science Edition

基　　金：国家自然科学基金项目(52178378);中铁第四勘察设计院集团有限公司科技研究开发项目(2020K143)。

摘　　要：为保证复合地层超大矩形顶管隧道近接下穿既有高铁的施工安全,以某超大矩形顶管隧道下穿杭深线高铁工程为背景,采用数值仿真和现场实测方法对复合地层超大矩形顶管隧道近接下穿高铁施工安全及加固技术进行了研究。结果表明:该超大矩形顶管隧道在复合地层中近接下穿既有高铁施工时,轨道沉降超出安全阈值,必须采取施工加固措施;在n(硬岩比)≥0.75的复合地层中掘进时,超前注浆、地下连续墙+D型钢便梁和人工挖孔桩+D型钢便梁3种加固方案均可采用,在n<0.75的复合地层中掘进时,可采用地下连续墙或人工挖孔桩+D型钢便梁加固方案;综合考虑轨道沉降、管节安全系数及加固方案施工对既有高铁的影响程度,对该工程推荐采用人工挖孔桩+D型钢便梁的加固方案;现场监测结果表明,采用人工挖孔桩+D型钢便梁加固方案后,轨道沉降量降至1.46 mm,所有监控指标均处于安全范围内。研究结果可为类似矩形顶管隧道近接施工设计与实施提供参考。To ensure the construction safety of a large rectangular pipe jacking tunnel in composite strata undercrossing an existing high-speed railway,this study investigates safety and reinforcement technologies through numerical simulations and field monitoring,taking the Hangzhou-Shenzhen high-speed railway undercrossing project as an engineering case.The results demonstrate that:①Unreinforced construction induces excessive track settlement exceeding safety thresholds when the large rectangular pipe jacking tunnel traverses composite strata beneath the railway;②Three reinforcement schemes are applicable for strata with a hard rock ratio(n)≥0.75,while diaphragm walls or hand-excavated piles combined with D-shaped steel temporary beams are recommended for strata with n<0.75;③Comprehensive evaluation of track settlement,segment safety factors,and construction impacts identifies the hand-excavated piles+D-shaped steel temporary beams scheme as optimal;④Field monitoring confirms post-reinforcement track settlement reduction to 1.46 mm,with all safety indicators complying with specifications.This research provides practical references for proximity construction design of similar rectangular pipe jacking tunnels.

关 键 词：隧道工程 矩形顶管 复合地层 近接施工 加固技术 

分 类 号：U45[建筑科学—桥梁与隧道工程]