延安黄河引水工程小断面长隧洞开挖施工技术

Excavation construction technology of small cross-section long tunnel in Yan'an Yellow River water diversion project

在我国黄土高原地区远距离供水线路中,多采用小断面长隧洞作为供水线路的主要组成部分。但在黄土高原地区小断面长隧洞施工中不仅存在着地下水位高、穿越地层多、岩性复杂、断层构造发育等不良地质,施工安全风险高;而且存在着隧洞断面小、洞内空间狭窄、施工难度大等技术难题。以延安黄河引水工程为依托,重点阐述延安黄河引水工程多种复杂地质条件下小断面长隧洞开挖施工技术,结论可为类似工程提供借鉴。

In the long-distance water supply lines of the Loess Plateau in my country, we mostly use the small cross sections as the main components of water supply lines in the long tunnels.However, there are some difficulties in the construction of long tunnels with small cross-sections in the Loess Plateau. There are not only bad geological conditions such as high groundwater level, multiple strata crossings, complex lithology, and fault structure development, but also high construction safety risks. Moreover, there are technical difficulties such as small cross-section of the tunnel, narrow space in the tunnel, and difficulty in construction. Relying on the Yan’an Yellow River water diversion project, we will mainly describe the construction technology of small cross-section long tunnel excavation under various complex geological conditions of Yan’an Yellow River water diversion project. The conclusion can provide a reference for similar projects.