大五山隧洞穿越对龙河浅埋暗挖方案研究

Scheme Research on Shallow Underground Excavation of Dawushan Tunnel Crossing Duilonghe

牛栏江-滇池补水工程大五山隧洞穿越对龙河段,存在地表环境复杂、埋深浅、地质条件复杂等不利施工的因素。为此,综合考虑技术、经济和环境影响等方面的因素,通过方案比选,设计采用了地表预固结灌浆、洞内钢支撑结合超前小导管等措施联合加强支护的方案,安全高效地穿过了该浅埋段,最终实现了施工安全、工期保证、投资合理、节能环保的目标,可为同类工程提供借鉴。

The Dawushan tunnel crossing Duilonghe segment of the Niulangjiang-Dianchi Lake Water Supplement Project has some disadvantages such as complex ground surface environment ,shallow buried depth ,and complicated geological conditions .In consideration of the technical ,economic ,and environmental factors ,the combined measure of pre-consolidation grouting on the ground and steel in the cave combined with advanced small pipe was applied to help the project crossing the shallow buried seg-ment successfully .The project finally realizes the goals of safe construction ,guaranteed working period ,reasonable investment , and energy conservation and environmental protection ,which can provide reference for other similar projects .