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Abstract An experimental apparatus is designed for studying the behavior of high velocity non-Darcy water flow through a single fracture. The fracture is constructed by two smooth parallel plates with variable apertures ranging from 0.5 mm to 6 mm. Circle water flow system and high hydraulic gradient are applied. The experiment is carried out and the behavior of non-Darcy water flow with high velocity is studied. A nonlinear relation between velocity of water flow and hydraulic gradient is fitted. Experimental results are compared with Lomize¢s formula and Su¢s formula；and it is found that they are similar when hydraulic gradient is low，but there are big differences when hydraulic gradient is high. Finally，the theoretical analysis of non-Darcy water flow through a single fracture and the related criterion are discussed. The relation between velocity and fracture aperture of non-Darcy water flow is also developed in order to apply conveniently in the engineering.
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Received: 02 March 2010
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