超浅埋多导洞平顶直墙暗挖技术在工程中的应用  

Application of Ultra-Shallow Mining Scheme with Multi-Pilot Tunnels,Horizontal Proof and Straight Wall in Municipal Passage Project

作　　者：杨红林 Yang Honglin

机构地区：[1]上海市隧道工程轨道交通设计研究院

出　　处：《隧道与轨道交通》2024年第1期58-62,82,共6页Tunnel and Rail Transit

摘　　要：城市地下浅埋暗挖工程,受上部市政管线埋深及其他因素的限制,常采用超浅埋、多导洞、平顶直墙暗挖方案。为保证工程安全,需采取全面注浆加固、大管棚和超前导管注浆等相应的加固措施。结合济南某地下换乘通道浅埋暗挖工程开展了数值模拟研究。结果表明:采取全断面土体加固,可以有效减小地表沉降、拱顶变形、净空收敛及初支内力等指标。综合考虑工程安全、地面沉降控制、施工效率、人工操作难度以及工程造价等因素,单洞开挖宽度宜控制在4m左右。Underground shallow excavation projects in urban areas,subject to the limitations of the upper municipal pipeline and other factors,often adopt an ultra-shallow mining construction proposal with multi-pilot tunnels,the horizontal proof,and straight walls.To ensure the safety of the mining project,it is necessary to take the corresponding reinforcement measures such as comprehensive grouting reinforcement,large pipe roof,and advanced pipe grouting.A numerical simulation study was carried out in combination with a shallow mining project of an underground interchange passage in Jinan.The results show that full-section soil reinforcement can effectively reduce surface settlement,vault deformation,headroom convergence,and internal force of initial support.Considering the factors of engineering safety,ground settlement control,construction eficiency,difficulty of manual operation,and project cost,the excavation width of a single tunnel should be about 4m.

关 键 词：浅埋暗挖 多导洞平顶直墙 土体加固 数值模拟 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]