浅埋大断面双连拱隧道地层变形控制技术  

FORMATION DEFORMATION CONTROL TECHNOI.OGY FOR A SHALLOW BURIED LARGE SECTION DOUBLE ARCH TUNNEL

作　　者：冀大禹 JI Da-yu(China Railway 18th Bureau Group First Engineering Co.,Ltd.,072750,Zhuozhou,Hebei,China)

机构地区：[1]中铁十八局集团第一工程有限公司,河北涿州072750

出　　处：《建筑技术》2024年第6期672-676,共5页Architecture Technology

摘　　要：由于特殊的断面形态,浅埋大断面双连拱隧道的施工通常伴随较大的风险。厦门某双连拱隧道断面面积为498.8 m2,面对复杂的地质条件和敏感的周边环境,地层变形控制是关键。该工程采用全孔一次性帷幕注浆,双侧壁导洞法、3层支护结构、支护时机优化等变形控制关键技术,通过FLAC3D数值模拟和理论分析,研究施工过程中横向、纵向地表沉降,分析地层变形云图,结果表明变形均在安全范围内。Due to the special cross-sectional shape,the construction of shallow buried large section double arch tunnels is accompanied by significant risks.The cross-sectional area of double arch tunnel is 498.8 m2.Facing complex geological conditions and sensitive surrounding environment,controlling geological deformation is crucial.Key deformation control techniques such as full hole one-time curtain grouting,double-sided wall guide tunnel method,three-layer support structure,and optimization of support timing were adopted.Through FlAC3D numerical simulation and theoretical analysis,the horizontal and vertical surface settlement during construction was studied,and the geological deformation cloud map was analyzed.The results showed that the deformation was within the safe range.

关 键 词：双连拱隧道 地层变形 超前支护 不对称开挖 分步开挖 

分 类 号：TU758.1[建筑科学—建筑技术科学]