软土地层地铁双线盾构推进地表沉降规律研究  

Research on surface settlement patterns during dual-track shield metro tunneling in soft soil layers

作　　者：薛华坤 李晓飞 许万丰 林本清 XUE Huakun;LI Xiaofei;XU Wanfeng;LIN Benqing(CCCC First Highway Xiamen Engineering Co.,Ltd.,Xiamen Fujian 361021,China;China Communications Third Navigation Bureau Sixth Engineering(Xiamen)Co.,Ltd.,Xiamen Fujian 361006,China;School of Civil Engineering,Fujian University of Technology,Fuzhou Fujian 350118,China)

机构地区：[1]中交一公局厦门工程有限公司,福建厦门361021 [2]中交三航局第六工程(厦门)有限公司,福建厦门361006 [3]福建理工大学土木工程学院,福建福州350118

出　　处：《现代城市轨道交通》2024年第9期97-104,共8页Modern Urban Transit

基　　金：福建省自然科学基金面上项目(2021J011062)。

摘　　要：在地铁隧道施工中,为提高施工效率,双线同步施工法被广泛采用。然而,该施工方法在加速施工进程的同时会增加对土体的扰动,尤其是面对软土地层等复杂多变的地质条件时,扰动更为显著,进而影响施工安全。文章以厦门地铁3号线为研究对象,采用ABAQUS有限元模拟软件,模拟盾构掘进的不同工况(单线掘进、不同掘进间距的双线同步掘进)。通过结合现场监测数据,验证模型的合理性。同时,分析不同工况施工对土体地表横截面的变化以及沿着开挖方向沉降的影响,结果表明:当双线同步掘进间距保持在30 m以上时,地表沉降现象得到有效控制,其影响程度显著降低,处于安全可接受的范围内。相关研究可为其他类似工程施工提供参考和借鉴。In metro tunnel construction,the doubleline synchronous construction method is widely adopted to improve construction efficiency.However,while this approach accelerates the process,it may increase soil disturbance,especially in complex and variable geological conditions such as soft soil,potentially endangering construction safety.This article takes Xiamen metro line 3 as the research object,utilizing ABAQUS finite element simulation software to simulate several different construction scenarios of shield tunneling,namely single-line excavation and doubleline synchronous excavation with varying distances.By combining field monitoring data,the model's reasonableness was verified.At the same time,the impact of different construction scenarios on the cross-sectional changes of the soil surface and the settlement along the excavation direction was analyzed.The results indicate that when the double-line synchronous excavations distance is maintained at more than 30 meters,surface settlement is effectively controlled,and the impact degree is significantly reduced,remaining within a safe and acceptable range.The relevant research could provide reference and inspiration for other similar construction projects.

关 键 词：地铁 同步施工 软土地层 有限元模拟 地表沉降 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]