非煤瓦斯隧道气密性喷射混凝土防突涌施工技术

Construction Technology of Airtight Sprayed Concrete Surge Prevention for Non-coal Gas Tunnels

非煤系地层瓦斯成因机制不清,且瓦斯分布具有随机性,预测困难,对隧道施工与运营安全性造成了极大的影响。为预防瓦斯突涌,本文依托重遵高速公路扩容项目桐梓隧道工程,从施工工艺流程、关键工序、纤维混凝土研制以及技术操作要点等方面,详细探讨了非煤系瓦斯隧道气密性喷射混凝土防突涌施工技术。结果表明:玄武岩纤维能显著提升混凝土的抗弯抗拉强度,减缓碱集料反应,减少回弹量,减碳降碳显著,气密性及耐久性好,具有显著的技术、经济与环保优势,可为类似非煤系地层瓦斯隧道工程提供建设经验。

The gas generation mechanism of non-coal strata is unclear,and the gas distribution is random and difficult to predict,which has a significant impact on the safety of tunnel construction and operation.In order to prevent gas surge,this article relying on the Tongzi Tunnel Projec of Chongqing-Zunyi Highway Expansion,from the construction process,key procedures,fiber concrete development and technical operation points to discuss in detail the non-coal gas tunnel gas-tight shotcrete anti-surge construction technology.The results show that basalt fibers can significantly improve the concrete bending and tensile strength,reduce rebound and significantly reduce carbon emissions,and have good air tightness and durability.This technology has significant technical,economic and environmental advantages,and provides construction experience for the construction of similar gas tunnels in non-coal strata.