大断面公路隧道的过程设计方法研究

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Abstract Process design method(PDM) of road tunnel with large cross-section is introduced according to the in-situ test study and finite element method(FEM) numerical simulation analysis of road tunnels in Longtoushan and Lanfeng，while the correlative practical mode is built subsequently. PDM is established based on the load-structure design method，and the loose load zone is defined by maximum tension strain of surrounding rock. PDM emphasizes more consideration about effect of a tunnel construction process，which is very different from both traditional road tunnel design codes and Протодъякнов?s(PUSI) theory. PDM optimizes the comparatively conservative support parameters by common design method，at the same time，of course can ensure the tunnel be at a whole safe state. Two engineering applications with different construction methods：double and single side-wall drift pilot excavations are studied，and the results show that PDM is more credible and practical than usual state one，and is better fit for the in-situ construction of tunnels with large cross-section. The results from this paper are in favor of advancing more efficient and reasonable design method of road tunnel with large cross-section，as well as to promote the current design level.

Key words： highway engineering large cross-section road tunnel process design method(PDM) tunnel load

Received: 21 May 2010

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http://www.rockmech.org/EN/Y2011/V30/IS2/3450

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