To provide a permeability evaluation method capable of minutely detecting the continuity of an individual watercourse in a base rock and a device.
A pair of boring holes 10 and 20 are bored in the base rock 1 in parallel with each other, and an injection section A partitioned with a packing 11 is formed in a predetermined depth of one boring hole 10 to inject a tracer P. In the other boring hole 20, a tracer detector 26 is made to rise or fall while pumping water in the hole by a predetermined flow rate to detect the distribution of the tracer P continued in the direction of the depth or its varying in time, and a position of the watercourse in the base rock 1 or permeability is obtained through the injection depth of the tracer P and the distribution of the tracer P or its variation. Favorably, the detection of the distribution of the tracer P in the other boring hole 20 is repeated while changing the depth of the injection section A of one boring hole 10, and the position of the watercourse in the base rock 1 or permeability is obtained through the distribution of the tracer P according to the injection depth of the tracer P or its variation.
ATSUMI HIROYUKI
TOIDA KATSU
| JP2002285535A | 2002-10-03 | |||
| JP2002250026A | 2002-09-06 | |||
| JP2000121657A | 2000-04-28 | |||
| JPH0355310A | 1991-03-11 | |||
| JP2002243850A | 2002-08-28 |
Reijiro Ichihigashi
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