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工程概况某隧道工程地处黄土台塬区,隧道区地面高程一般为411m～472m,最大埋深约45m,最小埋深约2～5m。洞身地表为漫坡地形,进口地表自然坡度为28°～46°,线路与地面线斜交,位于半坡上,两侧山体陡峭,交通不便。隧道洞身黄土陷穴很发育,分布范围较广。起迄里程DK721+541～DK723+784,全长2243m,其中Ⅳ级围岩936m,Ⅴ级围岩1307m。洞内线路纵坡为17‰的单面上坡,全隧道位于直线上。隧道开挖方法洞口施工方法隧道洞口施工采用挖掘机按设计开
Project Overview A tunnel project is located in loess plateau area, the tunnel area ground elevation is generally 411m ~ 472m, the maximum depth of about 45m, the minimum depth of about 2 ~ 5m. The surface of the cave body is of a gentle slope topography. The natural slope of the imported surface is 28 ° ~ 46 °. The line is oblique to the ground line and is located on the half slope. Both sides of the mountain are steep and the traffic is inconvenient. Tunnel cave loess cave is very developed, a wide range of distribution. From the beginning of mileage DK721 +541 ~ DK723 +784, a total length of 2243m, of which Ⅳ grade rock 936m, grade Ⅴ rock 1307m. Longitudinal slope of the line is 17 ‰ single-sided uphill, the tunnel located in a straight line. Tunnel excavation method Hole construction method Tunnel hole excavation by excavator design open