富水砂层大跨度平顶浅埋暗挖隧道施工技术

结合深圳滨海大道过街隧道的施工实践,分析了隧道所处的工程地质和水文地质情况,详细介绍了隧道穿越富水砂层的施工技术。根据隧道的断面尺寸、走向、埋深以及隧道围岩状况,周边环境条件和地面交通要求等情况采取超前排水、立体注浆封堵、增强初衬支护强度和刚度等措施,使隧道顺利贯通。

Construction Technology for Long-span, Flat-top Shallow Tunnels in Water-rich Sand Stratum

With the construction of the Through-street Tunnel under the Binhai Avenue as a practical example,this article describes the construction technology for tunnels crossing water-rich sand stratum.The geological and hydrological conditions of the tunnel project are first analyzed in the paper,with the construction techniques adopted for the construction of tunnels crossing water-rich sand stratum detailed.With the cross dimensions,trend,embedded depth,surrounding rock,as well as the surrounding environmental conditions,and traffic situation of the tunnel taken into account,such techniques as advanced draining,cubic slip-casting-blocking,strengthening the initial supporting and improving its stiffness are adopted to ensure the smooth progress of the construction of the tunnel.