地形不对称条件下盾构隧道掘进施工的地表沉降特性  

Surface settlement characteristic of shield tunnel excavation under asymmetrical terrain condition

作　　者：白伟 宁茂权[2] 关振长[3] BAI Wei;NING Maoquan;GUAN Zhenchang(China Railway South Investment Group Co.,Ltd.,Shenzhen,Guangdong 518052,China;China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan,Hubei 430064,China;College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China)

机构地区：[1]中铁南方投资集团有限公司,广东深圳518052 [2]中铁第四勘察设计院集团有限公司,湖北武汉430064 [3]福州大学土木工程学院,福建福州350108

出　　处：《福州大学学报（自然科学版）》2023年第2期205-212,共8页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(52278399);铁四院科技研究开发资助项目(2019K107)。

摘　　要：为解决盾构隧道掘进施工的地层扰动效应及其周边环境影响问题,依托福州地铁5号线农洪区间隧道工程,考虑刀盘顶推力、刀盘摩阻力、盾壳摩擦力和同步注浆压力,对其掘进施工过程展开精细化数值模拟,并与实测地表沉降结果进行对比分析.进一步地,引入宽度修正系数α,提出沿江不对称地形条件下的修正Peck公式;同时开展16种不同地形条件下的数值模拟,探讨岸坡距离与拱顶埋深对地表沉降特性的影响.结果表明:最大地表沉降S_(max)和宽度修正系数α,均随着岸坡距离和拱顶埋深的增大,呈近似线性的负相关趋势.上述研究可为类似条件下的盾构隧道施工提供借鉴.The ground disturbance and the environment influence caused by shield tunnel excavation is of great significance in both academic research and engineering practice.Considering jacking force,cutterhead friction,shield friction and synchronous grouting pressure,the excavation process of Nong-Hong internal tunnel in Fuzhou Metro Line 5 was carefully investigated by numerical simulations and the surface settlement calculated by refined numerical simulations was compared with the in-situ moni­toring results.Furthermore,the correction coefficient α for settlement trough width was introduced and the modified Peck formula for asymmetrical terrain along riverbank was proposed.Numerical simula­tions with 16 different terrain conditions were carried out,while the influences of riverbank distance and buried depth on the surface settlement were discussed.The simulation results showed that the maximum surface settlement S_(maX) and the correction coefficient α are negatively correlated with the distance adjacent to riverbank and the burial depth of crown.These researchers could provide some reference for the shield tunnel construction under similar conditions.

关 键 词：盾构隧道 沿江不对称地形 地表沉降特性 修正Peck公式 

分 类 号：U41[交通运输工程—道路与铁道工程]