不同施工条件下双线盾构隧道施工引发地表变形规律研究  

Study on surface deformation law of double line shield tunnel construction under different construction conditions

作　　者：牟天光 祝江林[1,2] Mou Tianguang;Zhu Jianglin(Hunan Province Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring,Hunan University of Science and Technology,Xiangtan 411201,China;School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学岩土工程稳定控制与健康监测湖南省重点实验室,湖南湘潭411201 [2]湖南科技大学土木工程学院,湖南湘潭411201

出　　处：《湖南文理学院学报（自然科学版）》2020年第4期75-79,共5页Journal of Hunan University of Arts and Science(Science and Technology)

基　　金：国家自然科学基金项目(41172275)。

摘　　要：为了了解双线盾构隧道在不同条件下施工引发地表变形规律,依托南宁地铁3号线某盾构区间工程,采用数值分析的方法,结合现场实测数据,分析了双线盾构隧道施工横向地表沉降规律,结果表明:(1)地表沉降表现出沉降槽形式,最大地表沉降量出现在两隧道之间偏先行洞一侧;(2)当土仓压力小于朗肯理论主动土压力时,土仓压力增加20%,地表沉降量减小约10%;(3)随着隧道埋深的增加,地表沉降量表现为非线性逐渐减小规律;(4)随着土体变形模量的增加和泊松比的减小,地表沉降量逐渐减小;(5)随着土体内摩擦角的增大,地表沉降量表现为非线性逐渐减小规律。In order to study the law of surface deformation caused by the construction of double-line shield tunnel under different conditions,based on a shield section project of Nanning Metro Line 3,the law of transverse surface subsidence in the construction of double-line shield tunnel is analyzed by numerical analysis and field measured data.The results show that:(1)the surface subsidence shows the form of settlement trough,and the maximum surface subsidence appears on the side of the first tunnel between the two tunnels;(2)when the silo pressure is less than the active soil pressure of Rankine theory,the silo pressure increases by 20%and the surface subsidence decreases by about 10%;(3)As the buried depth of the tunnel increases,the surface settlement shows a non-linear and gradually decreasing law;(4)With the increase of soil deformation modulus and the decrease of Poisson's ratio,the amount of ground settlement gradually decreases;(5)With the increase of the friction angle in the soil,the surface settlement shows a non-linear gradually decreasing law.

关 键 词：盾构隧道 数值分析 地表变形 

分 类 号：U231[交通运输工程—道路与铁道工程]