超大直径泥水盾构穿堤施工技术

Dyke-crossing Construction by Slurry Shield with Super Large Diameter

摘要:

盾构掘进施工过程中，由于开挖破坏了地层原始应力状态，地层产生应力增量，特别是剪应力增量，引起地层移动导致不同程度的地面沉降。超大直径泥水平衡盾构掘进施工参数控制不当极易造成地面沉降差异过大，影响地面建（构）筑物安全和使用。对南京纬三路过江通道N线大直径泥水平衡盾构穿堤掘进施工进行总结，为类似大直径泥水平衡盾构穿越地面建筑物施工提供借鉴。

Abstract:

The original stress sate of the formation is destroyed in the shield tunneling construction. Formation stress increment, especially shear stress increment, will cause ground movement and result in ground settlement in different degree. If construction parameters are not in proper control in super large diameter slurry shield tunneling, too serious ground settlement will affect the safety and usage of ground construction. The summarization is made on a dyke-crossing construction project by large diameter slurry balance shield in Nanjing, which can be taken as reference to the similar construction.