近距离并行高架时盾构施工防护技术

Protective technique for shield construction in short-range parallel to the high bridge piers

为了解决盾构机近距离并行地铁掘进施工对高架地铁造成的影响,通过数值仿真、试验分析、现场监测等手段,对钻孔灌注桩、复合锚杆桩、跟踪注浆3种不同结构形式的隔离桩防护效果进行分析对比,选择最佳防护方案,应用于既有高架地铁线路的防护,保证盾构掘进过程中既有地铁线路运营安全,为在城市中进行类似施工提供经验。

In order to solve the impact of shield machine in short-range parallel to metro excavation on the elevated metro,the protection effects of three different structural forms of isolation piles:bored piling,composite anchor piling and tracking grouting were analyzed and compared by means of numerical simulation,experimental analysis and in-site testing.The best protection scheme was selected and applied to the protection of the existing elevated metro lines to ensure the safety of the existing metro lines in the process of shield tunneling,so as to provide experience for similar construction in cities.