The effect of rock fragments on the hydraulic properties of soils

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Description

Many soils contain rock fragments the sizes of which are much larger than the average pore size of the sieved soil. Due to the fact that these fragments are often fairly large in relation to the soil testing apparatus, it is common to remove them before performing hydrologic tests on the soil. The question then arises as to whether or not there is a simple way to correct the laboratory-measured values to account for the fragments, so as to arrive at property values that can apply to the soil in situ. This question has arisen in the surface infiltration studies ... continued below

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26 p.

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Zimmerman, R.W. & Bodvarsson, G.S. April 1, 1995.

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Description

Many soils contain rock fragments the sizes of which are much larger than the average pore size of the sieved soil. Due to the fact that these fragments are often fairly large in relation to the soil testing apparatus, it is common to remove them before performing hydrologic tests on the soil. The question then arises as to whether or not there is a simple way to correct the laboratory-measured values to account for the fragments, so as to arrive at property values that can apply to the soil in situ. This question has arisen in the surface infiltration studies that are part of the site characterization program at Yucca Mountain, where accurate values of the hydraulic conductivities of near-surface soils are needed in order to accurately estimate infiltration rates. Although this problem has been recognized for some time, and numerous review articles have been written there are as yet no proven models to account for the effect of rock fragments on hydraulic conductivity and water retention. In this report we will develop some simple physically-based models to account for the effects of rock fragments on gross hydrological properties, and apply the resulting equations to experimental data taken from the literature. These models are intended for application to data that is currently being collected by scientists from the USGS on near-surface soils from Yucca Mountain.

Physical Description

26 p.

Notes

INIS; OSTI as DE95016523

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  • Other Information: PBD: Apr 1995

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  • Other: DE95016523
  • Report No.: LBL--37018
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/102527 | External Link
  • Office of Scientific & Technical Information Report Number: 102527
  • Archival Resource Key: ark:/67531/metadc623689

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  • April 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 4, 2016, 9:18 p.m.

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Zimmerman, R.W. & Bodvarsson, G.S. The effect of rock fragments on the hydraulic properties of soils, report, April 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc623689/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.