特殊用法bridge excavation1.桥基开挖common excavation1.普通挖方cutting excavation1.路堑dry excavation1.干开挖hand excavation1.人工开挖hydraulic excavation1.水力挖土, 液压掘挖shield excavation1.盾构掘进tunnel excavation1.隧道开挖undersea excavation1.海底开挖