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１工程概况南水北调东线穿黄输水隧洞位于山东省东阿和东平两县境内的黄河位山险工段上，沿位山与解山之间的马鞍型山梁河床底部穿过黄河。为了查明隧洞穿过的地层地质条件，研究在黄河底部建隧洞的施工技术及对黄河的影响，在中间隧洞的轴线上部开挖一条勘探试验洞（以下简称
1 Project Overview The Yellow River water diversion tunnel in the east line of the South-to-North Water Diversion Project is located on the Yellow River section of the Yellow River in the two counties of Dong-A and Dong-Ping in Shandong Province. It crosses the Yellow River at the bottom of the saddle-shaped mountain beam bed between Ancestral Hill and Anshan Mountain. In order to find out the geological conditions of the strata through the tunnel and to study the construction technology of the tunnel at the bottom of the Yellow River and the influence on the Yellow River, an exploration test tunnel was drilled in the upper part of the axis of the tunnel (hereinafter referred to as