rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Determination of diffusion coefficient through laboratory tests and analytically validating it using empirical relations for unsaturated soils
  name:
    name part: Thakur, Anshuman B., 1981-
    role:
      role term: creator
  name:
    name part: Lytton, Robert L.
    role:
      role term: thesis advisor.
  name:
    name part: Aubeny, Charles Paul
    role:
      role term: thesis advisor.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2005
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: electronic
    form: remote
  abstract: Soil suction is one of the most important physical variables affecting the soil engineering behavior, moisture content. Suction has a major controlling influence on soil shear strength. The moisture diffusivity properties of unsaturated properties of soils exert a critical influence on the depth to which seasonal variations of moisture and suction at the ground surface extend into the soil mass. Hence, a study of moisture diffusion coefficient is pivotal. In this research the drying test originally proposed by Mitchell (1979) has been validated by back calculating the moisture diffusion values using the empirical relation established by Lytton (2003). The non-linear flow through unsaturated soils has been simplified to a linear problem for simplicity in this study. Owing to this simplification, certain refinements have therefore been applied in the determination of diffusion coefficient. Thermocouple psychrometer was used to measure the soil suction along the length of the sample and at different times in the laboratory. Initial suction measurements were done using the filter paper test. Curve fitting procedure established by (Aubeny and Lytton, 2003), has been used for the determination of the diffusion coefficient. Analytical validation of the moisture diffusion coefficient, required coefficient of permeability, 'k', slope of suction water characteristic curve 'S' and air entry value 'h₀' as the major input parameters. Mitchell (1979) assumed the value of 'h₀' to be 100 cm. In this research air entry value, 'h₀' has been re-evaluated and it comes out to be higher than the pre estimated value. The value of slope of suction water characteristic curve, 'S' obtained from pressure plate tests, compares well to the empirical equation of Lytton (2003). The results of moisture diffusion coefficient obtained from the empirical equation come out in the same range as obtained from the refined Mitchell's (1979) drying test. The refinements includes introduction of constant te…
  note: by Anshuman B. Thakur.
  note: "Major Subject: Civil Engineering"
  note: Title from author supplied metadata (automated record created on Nov. , 09:45:50.)
  note: Vita.
  note: Abstract.
  note: Electronic resource.
  note: Mode of access: World Wide Web.
  note: System requirements: World Wide Web access and Adobe Acrobat Reader.
  note: M. S. Texas A&M University 2005.
  note: Includes bibliographical references.
  note: Text (Thesis).
  subject:
    topic: Major civil engineering
  subject:
    topic: Air entry value
  subject:
    topic: Diffusion coefficient
  subject:
    topic: Slope of suction water characteristic curve
  identifier: http://hdl.handle.net/1969.1/2713
  record info:
    record content source: TXA
    record creation date: 061116
    record change date: 20151104085122.0
    record identifier: in00002203468