干燥粉细砂隧道超前预加固与施工研究

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Abstract Shangbai large cross-section tunnel in Datong-Xi?an Passenger Dedicated Lines passes through dry fine sand layers. Its construction technologies are difficult and risky. Through the comparative field experiments of close-packed small pipe and deep secant pile of pre-reinforcement，it is found that the deep secant pile pre-reinforcement scheme can effectively control the quick sand and sand gushing during the tunnel excavation. Meanwhile the physico-mechanical parameters of the fine sand layers and consolidation body are obtained by deep secant pile test through laboratory tests，including direct shear tests，triaxial tests and unconfined compression tests. On this basis，through the numerical simulation and field test of tunnel excavation method in dry fine sand layers，the reasonable construction scheme is proposed. The results can provide technical support for Shangbai tunnel construction and reference for similar projects.

Key words： tunnelling engineering dry fine sand layers pre-reinforcement construction

Received: 25 December 2012

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http://www.rockmech.org/EN/Y2013/V32/I9/1909

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