QUALITY CONTROL METHOD FOR BENTONITE-CONTAINING IMPERVIOUS LAYER

Japanese Patent JP2023131213

A

To provide a quality control method for a bentonite-containing impervious layer ensures quality control by measuring the penetration resistance force of the bentonite-containing impervious layer, even at a slope face or a narrow part.SOLUTION: A quality control method for a bentonite-containing impervious layer comprises: an abutting step 6 for bringing a penetration resistance force detection device, which has a penetration part penetrated into an impervious layer containing bentonite ballast or bentonite mixed soil and a resistance force detection part for detecting the penetration resistance force which the penetration part receives from the impervious layer and is usable in a gripped state in the hand, into contact with the target impervious layer so as to allow the penetration part to penetrate roughly orthogonally into the impervious layer; a resistance force detection step 7 which makes the penetration part enter into the impervious layer and detects the penetration resistance force received by the penetration part through the resistance force detection part; a water permeability coefficient conversion step 9 in which a conversion device receives the penetration resistance force detected in the resistance force detection step 7 and in which the conversion device calculates a water permeability coefficient from the penetration resistance force; and a determination step 11 in which a determining device determines that the water permeability coefficient calculated in the water permeability coefficient conversion step 9 is equal to or less than a threshold value.SELECTED DRAWING: Figure 1

NARISHIMA SEIICHI

JP2022035812A

September 22, 2023

March 09, 2022

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NATURAL BLANKET INST

E02D1/08; G01N33/24

Mitsuyasu Miura
Takayuki Nagihara

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