Support info of Discussion and Case Study of the Rational Ratio of Rock Mass Thickness and Tunnel Span of Mined Subway Tunnels in Upper-Soft and Lower-Hard Ground

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	2015, Vol. 52(6): 28-35 DOI:

	Discussion and Case Study of the Rational Ratio of Rock Mass Thickness and Tunnel Span of Mined Subway Tunnels in Upper-Soft and Lower-Hard Ground


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