摘要
东莞市地铁1号线新建盾构隧道以1.73 m的极小净距离上跨已营运的莞惠城际隧道,新隧道上、下半圆分别位于全、中风化花岗岩中。此外,在新隧道盾构路径上存在原隧道施工时遗留的若干锚索,对盾构机运行存在重大安全影响。为了保障盾构施工安全及严格限制新隧道施工对既有隧道的影响,采取多方面的控制措施,包括通过试验段和数值模拟优选掘进参数、预先进行地层注浆加固、停机开仓法切割锚索、位移监测等。最终,盾构上跨施工顺利完成,监测显示地层和既有隧道的位移控制取得了良好的效果。通过对该工程的施工控制技术进行较全面的介绍,可为今后类似工程提供借鉴。
The new shield tunnel for Dongguan Metro Line 1 was constructed with an extremely small clearance of 1.73 meters over the existing Dongguan-Huizhou intercity tunnel.The upper and lower semicircles of the new tunnel are situated in fully and moderately weathered granite,respectively.Moreover,the shield path of the new tunnel encountered residual anchor cables from the existing tunnel,posing a significant threat to the shield operation.To ensure shield operation safety and minimize the impact of new tunnel construction on the existing tunnel,multiple control measures were implemented after specialized research.These measures included optimizing shield excavation parameters through trial interval tunneling and numerical simulation,reinforcing the overburden soil layers with pre-grouting,cutting anchor cables using a newly developed method of“shield stop-silo open-manual cutting”,and conducting in situ displacement monitoring.The construction of the new tunnel was successfully completed,and monitoring data show that displacement control was effective.This paper comprehensively details the construction control technologies used in this project,which should be valuable for similar future projects.
作者
穆亦龙
周小文
刘怀宇
MU Yi-long;ZHOU Xiao-wen;LIU Huai-yu(China Railway South Investment Group Co.,Ltd.,Shenzhen 518052,China;State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,China)
出处
《长江科学院院报》
北大核心
2025年第2期122-128,共7页
Journal of Changjiang River Scientific Research Institute
关键词
盾构隧道
花岗岩
既有隧道
锚索
变形控制
shield tunnel
granite
existing tunnel
anchor cable
deformation control
