双线盾构隧道小角度近距离斜穿既有隧道影响分析  

THE ANALYSIS OF DOUBLE-LINE SHIELD TUNNEL PASSING THROUGH EXISTING TUNNEL AT A SMALL ANGLE AND SHORT DISTANCE

作　　者：金志伟 JIN Zhiwei(Hefei Rail Transit Group Co.,Ltd.,Hefei 230000,China)

机构地区：[1]合肥市轨道交通集团有限公司,合肥230000

出　　处：《低温建筑技术》2025年第1期110-113,共4页Low Temperature Architecture Technology

摘　　要：为研究双线盾构隧道小角度近距离斜穿对既有隧道的影响,文中以合肥2号线延长线下穿既有2号线出入场线为背景,通过Midas GTS模拟施工阶段对出入场线管片变形的影响并提出相应的工程措施,结合现场监测数据进行验证措施的有效性。出入场线左线受2号线延长线盾构下穿两次影响较大,出入场线左线隧道管片水平最大位移1.34 mm,最大竖向变形为3.29 mm,满足合肥地区隧道结构变形控制指标要求。监测数据表明穿越段增设注浆孔及施作试验段控制掘进参数可以进一步控制隧道变形,将变形控制在2 mm以内,为长三角地区类似黏土层盾构掘进变形控制提供参考。Taking the Hefei Line 2 extension line that passes beneath the existing Line 2 entrance/exit track as the case,we investigate the impact of a small-angle,close-distance,and oblique crossing of a dual-line shield tunnel on an existing tunnel.The Midas GTS software is employed to simulate the construction phase and assess the impact of the shield tunnel crossing on the deformation of the entrance/exit line tunnel segments,while proposing corresponding engineering measures.These measures are then validated with field monitoring data.The results indicate that the left track of the entrance/exit line is significantly affected by the two-time shield tunneling passes of the Line 2 extension.The maximum horizontal displacement of the tunnel segment on the left track was 1.34 mm,and the maximum verti⁃cal deformation was 3.29 mm,both of which meet the deformation control requirements for tunnel structures in the Hefei region.Monitoring data shows that adding grouting holes in the crossing section and applying trial sections to control excavation parameters can further control tunnel deformation,keeping it within 2 mm.These findings provide a reference for deformation control during shield tunneling in similar clay strata in the Yangtze River Delta region.

关 键 词：双线盾构隧道 盾构斜穿 变形监测 

分 类 号：TU753[建筑科学—建筑技术科学]