滨海软土地层盾构始发区下穿高危地下管线设计研究

RESEARCH ON DESIGN OF SHIELD TUNNELING THROUGH HIGH RISK UNDERGROUND PIPELINE IN COASTAL SOFT SOIL

滨海软土地层盾构始发区是重大自身风险工程,盾构下穿易燃易爆类高危管线是重大环境风险工程,重大自身风险和重大环境风险叠加是对工程安全的重大考验。基于青岛地铁8号线过海区间盾构始发区下穿石油、燃气类高危管线的实际案例,采用地质研判和风险识别等系统分析方法,研究了一种在地铁隧道两侧设置“门式桥架”对高危管线进行原位悬吊保护的支撑系统,同时根据管线线位对盾构始发区做出了具有针对性的加固设计,依靠数值分析方法对管线变形进行了理论测算,通过实际施工现场监测发现,提出的高危管线保护方法是安全可靠的,可为类似工程提供可靠工程经验。

The starting of shield tunneling in coastal soft soil layer is a major self risk project.The shield tunneling through inflammable and explosive high-risk pipelines is a major environmental risk project.The superposition of major self risks and major environmental risks are major tests of project safety.Based on the actual case of the sea-crossing tunnel of Qingdao Metro Line 8 where the shield tunneling starts through high-risk pipelines such as oil and gas,through the use of systematic analysis methods such as geological research and risk identification,a support system with"portal bridge"on both sides of the subway tunnel for in-situ suspension protection of high-risk pipelines was studied.At the same time,a targeted reinforcement design was made for the shield tunneling starting area according to the pipeline location.Based on the numerical analysis method,the pipeline deformation was theoretically calculated.Through the actual construction site monitoring,the results show that the proposed high-risk pipeline protection method is safe and reliable,which can provide reliable engineering experience for similar projects.