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一、工程概况忠爱桥隧道在云南墨江县忠爱桥乡境内,位于国道213元江至磨黑高速公路13合同段K303+435-K303+660之间,全长225米。由于地面横坡陡,在此分离不开及平面曲线的情况,设计为带中隔墙的整体式双跨连拱结构。单跨净宽为11．43米,净高为7．8米,单跨采用单心圆,边墙侧为曲线,中墙为直线,中墙厚2米,隧道净空为24．82米,Ⅱ类软岩开挖跨度为26．78米,洞顶最大埋深32米, 最小埋深为70cm。
First, the project profile Zhong Ai Bridge Tunnel in Zhongnani love Miaoqiao Township, Yunnan Province, is located in the State Road 213 yuan to the Black Highway 13 Contract Section K303 +435-K303 +660, a total length of 225 meters. Due to the steep slope of the ground surface, the separation is not separated from the plane curve, and is designed as a monolithic double-span arch structure with a partition wall. Single span net width of 11.43 meters, a net height of 7.8 meters, a single cross with a single heart, side wall curve, the wall is a straight line, the wall thickness of 2 meters, the tunnel clearance of 24.82 meters, Ⅱ type of soft rock excavation span of 26.78 meters, the maximum buried depth of 32 meters, the minimum depth of 70cm.