黄土区湿软土层成洞技术研究

黄土区湿软土层成洞技术一直是水利水电工程及公路交通工程关键难题之一,主要介绍了湿软黄土层成洞技术的几种方法,着重介绍了目前广泛采用的新奥法施工原理,大管棚超前注浆支护的作用和原理以及施工工艺,为今后类似工程施工提供参考,对黄土高原淤地坝、土坝除险加固工程建设有着重要意义。实践表明:超前小导管与大管棚有机结合是黄土区湿软土层成洞的简单经济实用的施工技术。

Tunnel-excavated Technology in Wet and Soft Soil Layer in Loess Region

The tunnel-excavated technology in wet and soft soil layer in a loess region is one of the key problems in the water conservancy and hydropower project and the traffic project. Some excavated methods are mainly introduced here, and the construction principal of NATM widely used at present and the principal and construction technology of the advanced grouting support with the big pipe shed are introduced emphatically. All these have an improtant significance to the project of the silt arrester and the stabilization for dangerous release in loess plateau area. The practice shows that the method combining the small guide pipe with the large guide pipe shed is an easy and ecomomic construction technology for the tunnel excavated in wet and soft soil layer in a loess region.