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山区地形险要,河床弯曲狭窄,再加上常年受河水侵蚀和风化作用后,地势陡峻,为改善线形、提高车速、缩短里程、节省时间,需要修建隧道来满足山岭重丘区的需求,称之为傍山隧道。随着我国城市建设和高速公路的不断发展,双连拱隧道以其接线难度小、占地少、环境保护好等优势而被普遍运用,但工程造价很高。而小净距隧道双洞的中夹岩柱宽度介于连拱隧道和双线隧道之间,一般小于1.5倍隧道开挖断面的宽度,在造价方面有一定的可比性。
Mountain topography is dangerous, narrow riverbed, coupled with perennial erosion and weathering by the river, the steep terrain, to improve the linear, increase speed, shorten the mileage and save time, you need to build tunnels to meet the needs of mountain heavy hilly area, called To mountain road tunnel. With the development of urban construction and expressway in our country, double-arch tunnel is widely used due to its low wiring difficulty, small area and good environmental protection, but the project cost is high. However, the width of the middle column of double-hole tunnel with small clear distance is between the double-arch tunnel and the double-lane tunnel, generally less than 1.5 times the width of the tunnel excavation section, and has certain comparability in cost.