某过江隧道江心洲防洪大堤开挖对周围环境的影响分析

Analysis of the Influence of Excavation of Jiangxinzhou Flood Control Embankment in a River-crossing Tunnel on Surrounding Environment

相较于矿山法、新奥法等隧道施工技术,盾构法具备安全可靠、施工效率高、环境影响程度较小的优点。但是,在盾构法应用过程中仍旧存在周围环境土体扰动的情况,造成了施工环境的动态变化,对工程项目的施工质量造成了极大的威胁。文章以某过江隧道江心洲防洪大堤为工程案例,对盾构开挖大堤产生的纵、横向地表沉降进行监测方案设计及沉降结果分析。结果表明,盾构施工参数及地质水文条件会对纵横向地表沉降产生极大影响,且盾构开挖大堤需要加强现场监测数据的反馈,这有助于及时调整必要的盾构施工参数及施工工艺,确保项目安全稳定。

Compared with tunnel construction technologies such as mine tunnelling method,New Austrian Tunnelling Method,shield method has the advantages of safety and reliability,high construction efficiency and less environmental impact.However,the surrounding soil disturbance still exists in the application process of shield method,which causes dynamic changes of construction environment and poses a great threat to the construction quality of engineering projects.Taking Jiangxinzhou flood control embankment in a river-crossing tunnel as an engineering case,this paper designs the monitoring scheme and analyzes the settlement results of longitudinal and transverse surface settlement caused by shield excavation of the embankment.The results show that the shield construction parameters and geological and hydrological conditions will have a great impact on the longitudinal and transverse surface settlement,and the feedback of field monitoring data needs to be strengthened in the shield excavation of embankment,which helps to timely adjust the necessary shield construction parameters and construction technology to ensure the safety and stability of the project.