淤泥质土浅埋暗挖隧道下穿既有管线影响研究  

Research on the Influence of Shallow-buried Excavation Tunnel Passing through Existing Pipelines in Muddy Soil

作　　者：张学进[1] ZHANG Xuejin(China Railway First Group Co.Ltd,Xi'an,Shaanxi 710054,China)

机构地区：[1]中铁一局集团有限公司,西安710054

出　　处：《铁道工程学报》2020年第7期77-83,共7页Journal of Railway Engineering Society

摘　　要：研究目的:城市浅埋暗挖隧道经常近距离下穿既有建筑物,因此针对开挖引起地层及结构的变形影响研究具有重要意义.依托杭州市紫之隧道下穿既有地下管线工程,采用三维有限元数值模拟,研究在淤泥质地层中隧道底到地表距离H、隧道与管线夹角θ等因素对管线和地层变形的影响.研究结论:(1)与隧道交汇处的管线变形具有先缓慢沉降,接着快速沉降,最后逐渐趋于稳定的三阶段沉降规律;(2)管线的最小沉降量均位于管线的起始端,而最大沉降量随着θ的增大,逐渐从管线的末端向管线的中间段移动;(3)相同θ下,随着H的增大,管线最大沉降量逐渐增大;而相同H下,随着θ的增大,管线最大沉降量逐渐减小;(4)本研究成果可为淤泥质地层隧道下穿既有管线工程精细化设计与施工提供参考.Research purposes:Urban shallow-buried excavation tunnels often pass through existing buildings at a short distance,so it is of great significance to study the effects of ground and structure deformation caused by excavation.This paper relied on the project of the Zizhi tunnel in Hangzhou city passing through the adjacent underground pipelines,used3 D finite element numerical simulation,studied the effect of factors on pipeline and stratum deformation in muddy stratum such as distance(H)from the bottom of the tunnel to the surface and the angle(θ)between the tunnel and the pipeline.Research conclusions:(1)The deformation of the pipeline at the intersection with the tunnel has a three-phase settlement rule that first slowly subsides,then rapidly subsides,and finally stabilizes;(2)The minimum settlement value of the pipeline is located at the beginning of the pipeline,but with the increase ofθ,the maximum settlement value gradually moves from the end of the pipeline to the middle of the pipeline;(3)The maximum settlement of the pipeline gradually increases with the increase of H at the sameθ;but the maximum settlement of the pipeline decreases gradually with the increase ofθat the same H;(4)The research results can provide the reference for the fine design and construction of muddy stratum tunnel passing through underground pipelines engineering.

关 键 词：淤泥质土 浅埋暗挖 大断面隧道 变形规律 既有地下管线 

分 类 号：U45[建筑科学—桥梁与隧道工程]