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通过平昌县牛角坑水库干渠一期工程皇后坪1#隧洞开挖的工程试验,论述了9~12孔平行直孔掏槽与水平V形掌子面的联合应用对提高小型隧洞全断面开挖单循环进尺的重要作用。试验结果表明,这种联合应用,可使小型隧洞单循环进尺提高到隧洞宽度的93.5%,并且这一联合应用为小型隧洞全断面开挖提供了一种新方法,使隧洞开挖单循环进尺不再受洞径减小的影响,对同类工程施工有借鉴意义。
Through the engineering test of 1 # tunnel of Huangqeping in the first phase project of NiujiaoKeng reservoir trunk canal in Pingchang County, the joint application of 9 ~ 12 parallel straight hole undercutting and horizontal V-shaped facet is discussed. Dug a cycle of the important role of footage. The test results show that this combined application can increase the single-cycle footage of small tunnels to 93.5% of the tunnel width, and this joint application provides a new method for full-face excavation of small tunnels, which makes single tunnel excavation footage No longer affected by the reduction of the diameter of the tunnel, for reference to the construction of similar projects.