层状黄土中浅埋隧道暗挖诱发的变形特征分析

作者:范晨辉 张洪耀 高翔 武新平 连京 张勋
单位:中铁七局集团西安铁路工程有限公司 长安大学建筑工程学院
摘要:控制地表沉降是浅埋地铁隧道暗挖施工必然面临的重要问题。针对西安市某层状黄土中浅埋暗挖隧道,通过现场实际测量和FLAC3D数值模拟对地表及围岩沉降、超前注浆导管、隧道衬砌结构受力与变形的响应规律进行了综合分析。结果表明,层状黄土中浅埋隧道暗挖诱发的地表、围岩及衬砌结构沉降随着开挖深度的增大基本呈初始快速增大而后趋于平稳的两阶段变化特征。采用0.5m进尺进行层状黄土中浅埋隧道暗挖施工能够满足隧道衬砌结构受力变形的安全性要求,而使用超前注浆导管技术能有效提高隧道周围黄土地层的自稳能力,确保了施工安全。
关键词:地铁隧道黄土浅埋暗挖超前注浆导管变形
作者简介:范晨辉,工程师,E-mail:fanchenhuifan@126.com。
基金:长安大学企事业单位委托科技项目(18A49)。 -页码-:99-103
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Analysis on Deformation Characteristics Induced by Excavating in Shallow-buried Tunnel Construction in Layered Loess
FAN Chenhui ZHANG Hongyao GAO Xiang WU Xinping LIAN Jing ZHANG Xun
(Xi'an Railway Engineering Co., Ltd.of China Railway No.7 Bureau Group School of Civil Engineering, Chang'an University)
Abstract: Controlling the surface settlement is an important problem for the construction of shallow-buried tunnel. For the shallow buried tunnel in layered loess in Xi'an city, the settlement of ground surface, surrounding rock, the force and deformation of tunnel lining structure and advanced grouting pipe are comprehensively analyzed by the field measurement and FLAC3 D numerical simulation. The study results show that the settlement of ground surface, surrounding rock and lining structure induced by underground excavation of shallow-buried tunnels in layered loess basically increases rapidly at the beginning and then tends to be stable with the increase of excavation depth. When the construction footage of tunnel in layered loess is 0.5 m, the safety requirements of stress and deformation of tunnel lining structure can be ensured. The advanced grouting pipe technique can effectively improve the self-stability of loess stratum around the tunnel and ensure the safety of construction.
Keywords: subways; tunnels; loess; shallow-buried excavation; advanced grouting pipe; deformation
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