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《Journal of Shijiazhuang Railway Institute》 1989-01
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Research on Factors Influencing Constructional Advance of Railway Tunnel

Project Group of Rations on Construction Duration for Railway Tunnels Department of Railway Construction  
Based on analysis of pragmatic surveying in formations form 2,002 tunnels distributed on 40 railways constructed after liberation, such as Chengkun, Chuan-Qian, Gui-kun and Xiaog-Qian etc. The instinct rules concerning the tunnel length, degree of peripheral rocks, number of service tunnels and its constructional advance and values of quantitaive norm are worked out by means of statistics.
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