复杂地层中多洞并排超浅埋暗挖施工方案研究  

Study on construction scheme of multiple tunnels side-by-side ultra-shallow underground excavation in complex strata

作　　者：郑国辉[1] 周雷[1] 李祥 王超[1] ZHENG Guohui;ZHOU Lei;LI Xiang;WANG Chao(Beijing Institute of Water,Beijing 100048,China;Beijing River and Lake Basin Management Center,Beijing 102600,China)

机构地区：[1]北京市水利规划设计研究院,北京100048 [2]北京市河湖流域管理事务中心,北京102600

出　　处：《水利水电技术（中英文）》2023年第S01期144-150,共7页Water Resources and Hydropower Engineering

摘　　要：作为采取敞开开挖条件受限、施工区地上物较多的隧洞工程中广泛应用的浅埋暗挖法,施工中普遍存在的难题是如何在确保施工安全的基础上,对地表及建(构)筑物沉降、变形幅度进行合理控制,尤其是在复杂的地层中、不利的基础条件下,多洞并排超浅埋暗挖面对的难题更加突出。为了有效的破解该难题,制定科学、合理的浅埋暗挖施工方案,以富壁路暗涵项目为例,针对该工程隧洞覆土厚度小,地层为回填土,地下水高,地下管线多,多孔洞并联的隧洞型式等复杂、不利的基础条件进行施工方案研究,通过对施工降水、辅助工程措施进行方案比选,对施工方式、施工监测及安全措施要点进行分析,针对性的制定了相对合理的施工方案,有效保证了隧洞围岩的稳固,确保了工程安全、顺利进行,为今后相关工程浅埋暗挖施工方案提供借鉴。As the shallow-buried concealed excavation method widely used in tunnel engineering with limited open excavation conditions and many aboveground objects in the construction area,the common problem in the construction is how to reasonably control the settlement and deformation amplitude of the surface and buildings(structures)on the basis of ensuring construction safety.Especially in the complex strata and adverse foundation conditions,the problem faced by multi-hole side-by-side ultra-shallow-buried concealed excavation is more prominent.In order to effectively solve this problem and formulate a scientific and reasonable construction plan for shallow buried and concealed excavation,this paper takes Fubi Road concealed culvert project as an example,and studies the construction plan for the complex and unfavorable basic conditions of the project,such as the small thickness of the tunnel cover,the stratum is backfill,the high groundwater,the many underground pipelines,and the tunnel type with multiple holes in parallel.Through comparison and selection of construction dewatering and auxiliary engineering measures,the construction method The key points of construction monitoring and safety measures are analyzed,and a relatively reasonable construction scheme is formulated,which effectively ensures the stability of the surrounding rock of the tunnel,ensures the safety and smooth progress of the project,and provides a reference for the construction scheme of shallow-buried underground excavation of related projects in the future.

关 键 词：浅埋暗挖 复杂地层 覆土厚度 地下水 多洞并排 施工方案 

分 类 号：TV213.4[水利工程—水文学及水资源]