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下洋隧道位于省道306线福建永春境内下洋镇区,全长825米,最大埋深约180米。公路等级为山岭重丘区Ⅱ级一般公路。该隧道位于直线上,纵坡为—1.5%,隧道为三心圆断面,净宽10.5米,高5米,于1998年建成通车。几年运营后期,由于地下水作用,逐渐出现拱顶渗漏水、衬砌层出现裂缝等病害。为消除这些病害对行车安全造成的隐患,2002年6月起对隧道进行了病害整治。主要病害及原因
Under the ocean tunnel is located in 306 provincial highway Yongchun territory under the sea town, a total length of 825 meters, the maximum depth of about 180 meters. The grade of the highway is the grade Ⅱ general highway in the mountain heavy hill area. The tunnel is located on a straight line with a longitudinal slope of -1.5%. The tunnel is three-center cross-section with a net width of 10.5 meters and a height of 5 meters. It was opened to traffic in 1998. A few years later in operation, due to groundwater effects, the gradual emergence of vault water leakage, lining cracks and other diseases appear. In order to eliminate the hidden dangers of traffic safety caused by these diseases, the tunnel was rehabilitated since June 2002. The main diseases and causes