连拱隧道下穿城市主干道的地表沉降控制方法研究  

Study on Surface Settlement Control Method of Multi Arch Tunnel under Urban Main Road

作　　者：乔素云 王少华[2] 尹金涛[2] 李泉龙 李顺涛 QIAO Suyun;WANG Shaohua;YIN Jintao;LI Quanlong;LI Shuntao(Yichang Fuqiang Engineering Co.,Ltd.,Yichang,Hubei,443000,China;Hubei Three Gorges Polytechnic,Yichang,Hubei,443000,China)

机构地区：[1]宜昌富强工程有限责任公司,湖北宜昌443000 [2]湖北三峡职业技术学院,湖北宜昌443000

出　　处：《智能城市应用》2022年第2期39-42,共4页Smart City Application

基　　金：宜昌市自然科学研究项目《长阳清江画廊旅游码头深水基础施工研究》(项目编号A21-3-023);湖北省教育厅百校联百县项目(项目编号BXLBX1329)阶段性研究成果之一;2015年湖北省教育厅科技项目(项目编号B2015126)。

摘　　要：为了满足城市交通的进一步发展的需求,大量的地下道路在原有城市主干道下方建设,如何控制隧道开挖引起的地表沉降至关重要。以某城市地下道路双连拱隧道下穿主干道工程为对象,建立三维数值模型并计算,通过分析得到了隧道各部分最优的开挖间距:中导洞开挖约40 m后可开展主洞的开挖;左主洞左侧开挖约16m后可开展右主洞右侧部分的开挖,且该部分开挖16 m后可开展左主洞右侧的开挖;左主洞右侧开挖约12 m后可开展右主洞左侧的开挖。由于受左右主洞开挖影响的叠加,中导洞上方因此将产生最大的地表沉降。超前大管棚可以减小约40%的地表沉降和拱顶下沉量,具有较好的加固效果。无论是拱顶沉降、地表下沉还是隧道的衬砌应力,都处于安全范围内。表明按所设计的开挖和支护方法是可行的。In order to meet the needs of the further development of urban traffic,a large number of underground roads are built under the original urban trunk roads.How to control the surface settlement caused by tunnel excavation is very important.Taking the double arch tunnel under the main road of an urban underground road as the object,a three-dimensional numerical model is established and calculated.Through analysis,the optimal excavation spacing of each part of the tunnel is obtained:the excavation of the main tunnel can be carried out after the excavation of the middle pilot tunnel is about 40 m;After the left side of the left main tunnel is excavated for about 16m,the excavation of the right side of the right main tunnel can be carried out,and the excavation of the right side of the left main tunnel can be carried out after the excavation of this part is 16m;The excavation on the left side of the right main tunnel can be carried out after the excavation on the right side of the left main tunnel is about 12m.Due to the superposition of the influence of the excavation of the left and right main tunnels,the maximum surface settlement will occur above the middle pilot tunnel.The advance large pipe shed can reduce the surface settlement and vault settlement by about 40%,which has a good reinforcement effect.Whether it is vault settlement,surface subsidence or tunnel lining stress,it is within the safe range,which shows that the designed excavation and support method is feasible.

关 键 词：隧道工程 连拱隧道 下穿城市道路 数值计算 地表沉降 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]