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MODERN TUNNELLING TECHNOLOGY 2012, Vol. 49 Issue (4) :83-88    DOI:
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Construction Technique for the Gujiping Tunnel Portal Section in Shallow-Buried Loess
Lanzhou-Chongqing Railway Limited Liability Company
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Abstract The construction of shallow-buried ;oess tunnel portals is key to the safety of tunnel break-in. Based on the portal construction of the Gujiping double-track railway tunnel with a designed speed of 200km/h in surrounding rock of grade V, this paper introduces advance pre-reinforcement with large pipe-roof and three-bench and seven-step construction technology. The results indicate that this construction method is both rapid and effective, guaranteeing construction safety.
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Abstract： The construction of shallow-buried ;oess tunnel portals is key to the safety of tunnel break-in. Based on the portal construction of the Gujiping double-track railway tunnel with a designed speed of 200km/h in surrounding rock of grade V, this paper introduces advance pre-reinforcement with large pipe-roof and three-bench and seven-step construction technology. The results indicate that this construction method is both rapid and effective, guaranteeing construction safety.
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.Construction Technique for the Gujiping Tunnel Portal Section in Shallow-Buried Loess[J]  MODERN TUNNELLING TECHNOLOGY, 2012,V49(4): 83-88
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