Permeability Characteristics of High-Quality Undisturbed Gravelly Soils Measured in Laboratory Tests

Hatanaka, Munenori; Uchida, Akihiko; Taya, Yuji; Takehara, Naoto; Hagisawa, Tsuyoshi; Sakou, Noriaki; Ogawa, Shinya

doi:10.3208/sandf.41.3_45

Cited by 16 publications

(3 citation statements)

References 6 publications

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“…The ASTM standard (ASTM 2011c) requires lower than 10 -5 m/s, and that the K value of the porous stones must be significantly greater than that of the specimen to be tested. This verification was not performed for several papers (e.g., Hatanaka et al 1997Hatanaka et al , 2001Bandini and Shathiskumar 2009), for which the reported K values seem abnormally low. Mistake No.12 is easy to avoid by running prior verification tests with hollow cylinders.…”

Section: Rigid-and Flexible-wall Permeameters Common Mistakesmentioning

confidence: 98%

“…Mistake No.14: testing heterogeneous soil specimens cannot yield a good correlation between some average vertical K ave value and some average void ratio e ave . This happens with specimens containing several intact layers (each layer thickness may vary, and each layer void ratio may vary) as tested by Hatanaka et al (1997Hatanaka et al ( , 2001. This happens also when testing artificial (man-made) mixes of several layers, or a specimen that contains a heavily remoulded portion and a slightly remoulded portion.…”

Section: Rigid-and Flexible-wall Permeameters Common Mistakesmentioning

confidence: 99%

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Predicting the saturated hydraulic conductivity of soils: a review

Chapuis

2012

Bull Eng Geol Environ

302

118

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This paper examines and assesses predictive methods for the saturated hydraulic conductivity of soils. The soil definition is that of engineering. It is not that of soil science and agriculture, which corresponds to ''top soil'' in engineering. Most predictive methods were calibrated using laboratory permeability tests performed on either disturbed or intact specimens for which the test conditions were either measured or supposed to be known. The quality of predictive equations depends highly on the test quality. Without examining all the quality issues, the paper explains the 14 most important mistakes for tests in rigid-wall or flexible-wall permeameters. Then, it briefly presents 45 predictive methods, and in detail, those with some potential, such as the Kozeny-Carman equation. Afterwards, the data of hundreds of excellent quality tests, with none of the 14 mistakes, are used to assess the predictive methods with a potential. The relative performance of those methods is evaluated and presented in graphs. Three methods are found to work fairly well for non-plastic soils, two for plastic soils without fissures, and one for compacted plastic soils used for liners and covers. The paper discusses the effects of temperature and intrinsic anisotropy within the specimen, but not larger scale anisotropy within aquifers and aquitards.

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Section: Rigid-and Flexible-wall Permeameters Common Mistakesmentioning

confidence: 98%

Section: Rigid-and Flexible-wall Permeameters Common Mistakesmentioning

confidence: 99%

Predicting the saturated hydraulic conductivity of soils: a review

Chapuis

2012

Bull Eng Geol Environ

302

118

View full text Add to dashboard Cite

show abstract

“…Due to the directional distribution of particles caused by rolling compaction, gravelly soil often has obvious anisotropic characteristics after rolling compaction, and this may lead to a significant difference in the anisotropic permeability coefficient [49]. Although some scholars considered that the horizontal permeability coefficient is greater than the vertical permeability coefficient [55][56][57], the horizontal permeability coefficient measured in the same site (on-site or indoor) is usually several times larger than that in the vertical direction according to the actual measurement [34,[58][59][60]. Shen Zhejiang's inversion analysis of the seepage pressure of the core wall of Lubuge Dam also reveals greater horizontal permeability coefficient in general than the vertical one [61].…”

Section: The Effect Of Anisotropymentioning

confidence: 99%