富水砂砾地层小净距重叠盾构隧道施工措施研究  

Construction Measures for Overlapped Shielded Tunnels in Submerged Sand and Gravel Strata

作　　者：邓如勇 DENG Ruyong(China Railway Siyuan Group Southwest Survey and Design Co.Ltd.,Kunming 650220)

机构地区：[1]中铁四院集团西南勘察设计有限公司,昆明650220

出　　处：《土工基础》2025年第1期39-42,52,共5页Soil Engineering and Foundation

基　　金：中铁第四勘察设计院集团有限公司科技研发计划项目(KY2023065 S)。

摘　　要：目前针对重叠隧道穿越城市复杂环境施工,研究均聚焦在论证施工措施对控制地表沉降效果的有效性方面,从设备改造等源头系统进行重叠隧道施工的研究较少。以昆明地铁2号线环城南路站~昆明火车站完全重叠盾构区间穿越高承压泥炭质富水砂砾石地层施工为背景,介绍了复杂环境条件下小净距重叠盾构隧道施工辅助措施经验,包括盾壳减薄、盾构刀盘及支撑臂改造、壁后注浆模式优化、盾尾防水密封加强、下洞设置临时支撑、采用钢花管对两隧道间夹土进行注浆加固等。相关辅助施工措施的实施,保证了重叠盾构隧道施工安全及周边环境安全。相关工程措施及实施经验可为类似工程在复杂地质条件下施工提供借鉴和参考。Currently,studies on the construction control of overlapped tunnels passing through complex urban environments in China are mainly focused on demonstrating the effectiveness of construction measures in controlling the surface subsidence.There is relatively little research on the control of overlapped tunnel construction from the source system such as equipment improvement.This paper presents the construction of the overlapped shield tunnel section between the Huancheng South Road Station and the Kunming Railway Station of Kunming Metro Line No.2.This case history introduces the experience of construction measures for small distance overlapped and shielded tunnel construction under complex geological conditions.The specific auxiliary construction measures include shielded shell thickness reduction,improvement of the shielded cutter-head and the support arm,optimization of the grouting mode behind the wall,strengthening of waterproof sealing at the shielded tail,setting up temporary support in the first construction tunnel.Improving the engineering properties of the soil within the influence range of two tunnels through grouting reinforcement measures.The implementation of the relevant auxiliary construction measures ensures the safety of overlapped shielded tunnel construction in this project.The relevant engineering measures and the implementation experience can provide references and guidelines for similar projects in complex geological conditions.

关 键 词：富水砂砾地层 盾构施工 重叠隧道 施工措施 

分 类 号：U456[建筑科学—桥梁与隧道工程]