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Abstract The construction of the situation of four-lane tunnel is introduced，and then its developments of design and construction at present are analyzed. Supported by Longtoushan bidirectional expressway tunnel with 8 lanes in Guangzhou，the effect of stress path of rock pressure on large-section tunnel is fully studied and discussed by making use of site measured data and numerical results of rock load with different excavations；meanwhile，the range of rock loose area of large-section tunnel with 4 lanes is verified. The load effect-coefficient of guide hole is modified by the coefficient of . After that，the results calculated by the formula compared with that calculated by M. M. Promojiyfakonov Theory，design specifications of highway tunnel and the formula proposed by H. F. QU，a new formula is proposed to calculate the process load of large section tunnel.
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Received: 01 July 2009
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