深埋隧洞涌水预测非达西流模型及数值模拟

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Abstract The constitutive model of non-Darcy flow was established based on the laboratory data of high velocity non-Darcy flow through a single smooth parallel-plate fracture，and the determination method of non-Darcy flow influence coefficient was introduced. Generalized constitutive equation for both Darcy and non-Darcy flows was developed. The finite element method based on the generalized Darcy and non-Darcy flows constitutive equation was presented；and the basic iteration steps of non-Darcy flow analysis were performed according to conjugate gradient iterative method. Finally，the above theory and method were applied to the prediction of water inflow in a tunnel. By comparison of the two different calculation results for Darcy and non-Darcy flow theories，the necessity of adopting non-Darcy flow theory was explained. It is also found that the aperture of a big fracture and location of cross point of multiple faults have considerable influences on water inflow in the tunnel.

Key words： tunneling engineering non-Darcy flow non-Darcy flow influence coefficient conjugate gradient iterative method water inflow in tunnels finite elements

Received: 18 April 2012

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http://www.rockmech.org/EN/Y2012/V31/I9/1862

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