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1 工程概况 正在建设的常洪隧道位于宁波市区东北的东外环路穿越甬江的路段,全长3226m,为双向4条车道,甬江宽375m,江中段隧道采用沉管法施工,沉管管段长395m,由4节组成。江北暗埋段长80m,引道段长283m;江南暗埋段长69m,引道段长249m。隧道最大纵坡4％,江中段最小复土1.5m。隧道纵剖见图1所示。工程所处地层主要为灰色淤泥质粘土、灰色粘质粉土、灰色粉质粘土,具有含水丰富、
1 Project Overview The Changhong Tunnel under construction is located on the section of Donghuan Loop crossing the Yongjiang River in the northeastern part of Ningbo City. It has a total length of 3226m, a bidirectional 4 lanes and a Yongjiang River width of 375m. Length 395m, composed of 4 sections. The length of the tunnel in the north of Hubei Province is 80m long and 283m in length. The length of the buried section in the south of Yangtze River is 69m long and 249m in length. Tunnel 4% of the maximum longitudinal slope, the middle of the smallest section of the earth 1.5m. Longitudinal tunnel shown in Figure 1. The main strata of the project are gray silt clay, gray clay silty clay and gray silty clay, which are rich in water,