1. The underground diaphragm wall in Yellow River Undercrossing Project of the Middle Route in the South-to-North Water Diversion is the deepest and thickest one in China.
   南水北调中线穿黄工程地下连续墙是国内最深最厚的地下连续墙,地质条件差,施工难度大,施工中存在较大的风险。
2. Undercrossing tunnels are frequently constructed by the shield-driven method in metro projects.Shield tunneling affects the existing tunnel inevitably.
   摘要在地铁工程中，常采用盾构法修建正交下穿隧道，新隧道的掘进不可避免地对既有隧道产生影响。

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