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Measuring the Hydraulic Conductivity of Peats and Organic Clays with Various Characteristics
https://orcid.org/0000-0003-3900-6672
Abstract This paper discusses the hydraulic conductivity (k) of peat and organic clay as measured by laboratory and in-situ tests. The k of various peat soils and organic clay soils in Hokkaido, Japan, was investigated by the following tests: in-situ hydraulic conductivity test using a borehole, electric cone penetration test, oedometer test, and laboratory hydraulic conductivity test. The k of peat and organic clay dramatically decreases during consolidation. The index of change in k, which indicates consolidation-related changes in k, increases linearly with the increase in the in-situ void ratio and the ignition loss. The k of peat measured by oedometer test was found to range from approximately 1/20 to 1/180 of that measured by in-situ hydraulic conductivity test, which is considered to provide the macroscopic k of peat ground. Since large plant remnants must be removed for the oedometer testing of peat, the laboratory k obtained from this test underestimates the macroscopic k of the peat layer. The ratio of laboratory k to in-situ k can be simply expressed as a function of the ignition loss. Based on the results of a dissipation test of pore water pressure that used the electric cone penetration test, an equation for estimating the in-situ k of peat ground is presented. Using the above-mentioned experimental correlations, a suitable procedure for determining the permeability parameters of peat ground in practical applications is proposed.
Measuring the Hydraulic Conductivity of Peats and Organic Clays with Various Characteristics
https://orcid.org/0000-0003-3900-6672
Abstract This paper discusses the hydraulic conductivity (k) of peat and organic clay as measured by laboratory and in-situ tests. The k of various peat soils and organic clay soils in Hokkaido, Japan, was investigated by the following tests: in-situ hydraulic conductivity test using a borehole, electric cone penetration test, oedometer test, and laboratory hydraulic conductivity test. The k of peat and organic clay dramatically decreases during consolidation. The index of change in k, which indicates consolidation-related changes in k, increases linearly with the increase in the in-situ void ratio and the ignition loss. The k of peat measured by oedometer test was found to range from approximately 1/20 to 1/180 of that measured by in-situ hydraulic conductivity test, which is considered to provide the macroscopic k of peat ground. Since large plant remnants must be removed for the oedometer testing of peat, the laboratory k obtained from this test underestimates the macroscopic k of the peat layer. The ratio of laboratory k to in-situ k can be simply expressed as a function of the ignition loss. Based on the results of a dissipation test of pore water pressure that used the electric cone penetration test, an equation for estimating the in-situ k of peat ground is presented. Using the above-mentioned experimental correlations, a suitable procedure for determining the permeability parameters of peat ground in practical applications is proposed.
Measuring the Hydraulic Conductivity of Peats and Organic Clays with Various Characteristics
https://orcid.org/0000-0003-3900-6672
Abstract This paper discusses the hydraulic conductivity (k) of peat and organic clay as measured by laboratory and in-situ tests. The k of various peat soils and organic clay soils in Hokkaido, Japan, was investigated by the following tests: in-situ hydraulic conductivity test using a borehole, electric cone penetration test, oedometer test, and laboratory hydraulic conductivity test. The k of peat and organic clay dramatically decreases during consolidation. The index of change in k, which indicates consolidation-related changes in k, increases linearly with the increase in the in-situ void ratio and the ignition loss. The k of peat measured by oedometer test was found to range from approximately 1/20 to 1/180 of that measured by in-situ hydraulic conductivity test, which is considered to provide the macroscopic k of peat ground. Since large plant remnants must be removed for the oedometer testing of peat, the laboratory k obtained from this test underestimates the macroscopic k of the peat layer. The ratio of laboratory k to in-situ k can be simply expressed as a function of the ignition loss. Based on the results of a dissipation test of pore water pressure that used the electric cone penetration test, an equation for estimating the in-situ k of peat ground is presented. Using the above-mentioned experimental correlations, a suitable procedure for determining the permeability parameters of peat ground in practical applications is proposed.
Measuring the Hydraulic Conductivity of Peats and Organic Clays with Various Characteristics
Hayashi, Hirochika (author) / Hatakeyama, Osamu (author)
2020
Article (Journal)
Electronic Resource
English
BKL:
57.00$jBergbau: Allgemeines
/
38.58
Geomechanik
/
57.00
Bergbau: Allgemeines
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
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