PROBLEM TO BE SOLVED: To provide a method of evaluating a ground water flow capable of acquiring a local hydraulic gradient while retaining spatial consistency.;SOLUTION: A borehole 3 is drilled in a ground 1 to obtain a proper length of core 5. A ground water flow velocity is also acquired in an original position. Then, the core 5 is installed in triaxial testing cell 25 of a water permeable testing device 7 by flow velocity control, and side pressure is applied to the core 5 to be restricted at restriction pressure σc equivalent to rock pressure. Water is injected thereafter to the core 25 inside the triaxial testing cell 25 from a water injection pump 17a of a syringe pump main body 9 via an injection pipe 21, while controlling a flow velocity of the injected water to the core 5 to be brought into the same condition to the ground water flow velocity acquired in the original position, drain from the core 5 is circulated (fed back) to a drain pump 17b via a drain pipe 23, and differential pressure is measured between a water injection side and a drain side. The hydraulic gradient is acquired by dividing the measured differential pressure with a sample body length 27, and a permeability coefficient is acquired by dividing the ground water flow velocity given to the core 5 with the hydraulic gradient.;COPYRIGHT: (C)2008,JPO&INPIT
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