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西康高铁首条万米隧道贯通
图为隧道进口处。马千里 摄 西康高铁华家山隧道地处秦岭腹地,位于陕西省安康境内,隧道全长13153米,最大埋深532米,洞身地层有灰岩、千枚岩、板岩、片岩以及其互层,以千枚岩、片岩为主,属于软质岩,Ⅳ、Ⅴ级围岩占比73.4%,均处于极高地应力状态 ...
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