![]() J Geotech Eng JSCE 412:43–49 (in Japanese) Oikawa H (1989) A method for predicting e-log p curve and log c v-log p curve of a soft soil from its natural water content. Ohira Y (1971) Peat-engineering properties, investigation and design. J Geotech Geoenviron Eng ASCE 133(7):850–866 Mesri G, Ajlouni M (2007) Engineering properties of fibrous peats. Mesri G, Stark TD, Ajlouni MA, Chen CS (1997) Secondary compression of peat with or without surcharging. Leroueil S, Lerat P, Hight DW, Powell JJM (1992) Hydraulic conductivity of a recent estuarine silty clay at Bothkennar. Lea N, Brawner CO (1963) Highway design and construction over peat deposits in the lower mainland region of British Colombia. Landva AO, Pheeney PE (1980) Peat fabric and structure. Toyo-shoten Co., Ltd., Tokyo, pp 56–68 (in Japanese) Kogure K (1995) Geoengineering of highly organic soils. In: Proceedings of 5th Australia and New Zealand conference on geomechanics, pp 150–154 Kogure K, Ohira Y, Yamaguchi H (1988) Permeability anisotropy of fibrous peat in a permeameter. Japanese Industrial Standard (JIS) (2009) Test method for one-dimensional consolidation properties of soils using incremental loading (in Japanese) Japanese Geotechnical Society (JGS) (2018) Japanese Geotechnical Society standards for geotechnical and geoenvironmental investigation methods, vol 3, JGS 1314 Japanese Geotechnical Society (JGS) (2016) Japanese Geotechnical Society standards for geotechnical and geoenvironmental investigation methods, vol 2, JGS 1435 Japanese Geotechnical Society (JGS) (2015) Japanese Geotechnical Society standards for geotechnical and geoenvironmental investigation methods, vol 1, JGS 1221 Waterways Experiment Station, Corps of Engineers, U.S. Hvorslev MJ (1951) Time lag and soil permeability in ground water observations. Huat BBK, Prasad A, Asadi A, Kazemian S (2014) Geotechnics of organic soils and peat. In: Proceedings of 16th European conference on soil mechanics and geotechnical engineering, Edinburgh, pp 2401–2406 Hayashi H, Yamanashi T (2015) Estimation of hydraulic conductivity in peat and organic clay deposits. Hayashi H, Mitachi T, Nishimoto S (2008) Evaluation on permeability of peat using in-situ permeability test and oedometer test. In: Proceedings of the international symposium on pre-failure deformation characteristics of geomaterials, Sapporo, vol 1, pp 575–581 Hayashi H, Nishikawa J, Odajima H, Mitachi T, Fukuda F (1994) Deformation analysis of peat ground with cam clay model. In: Proceedings of 14th Asian regional conference on SMGE (CD-R) Hayashi H, Mitachi T, Nishimoto S (2011) Permeability parameters for FE analysis of peat ground. Hanrahan ET (1954) An investigation of some physical properties of peat. Using the above-mentioned experimental correlations, a suitable procedure for determining the permeability parameters of peat ground in practical applications is proposed.īaligh M, Levadoux J (1986) Consolidation after undrained piezocone penetration, II: interpretation. 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. The ratio of laboratory k to in-situ k can be simply expressed as a function of the ignition loss. 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 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. ![]() 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 and organic clay dramatically decreases during consolidation. 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. This paper discusses the hydraulic conductivity ( k) of peat and organic clay as measured by laboratory and in-situ tests.
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