Title: In-situ permeability test using pressure infiltrometer method
Abstract: An in-situ permeability test of soil using a pressure infiltrometer method is introduced and its applicability is examined. The pressure infiltrometer method involves a measurement of a steady-state infiltration rate required to maintain a steady depth of water within a single ring inserted a small distance into the soil. An equation to determine a field-saturated hydraulic conductivity is derived based on an infiltration theory. An apparatus as well as a procedure to measure the steady-state infiltration rate is quite simple. Firstly theoretical aspects of the pressure infiltrometer method are discussed. Two special features of the pressure infiltrometer method, a theoretical treatment of three-dimensional water flow out of the ring and a simple assumption of an exponential relationship between unsaturated permeability and pressure head of soil, are established. Then soil data published in the literatures are analyzed and numerical calculations to simulate a constant-head infiltration into soil are conducted to show the assumption of the exponential relationship affects significantly an accurate determination of the field-saturated hydraulic conductivity. It's also shown that values of soil parameter which has been recommended for the exponential relationship of unsaturated soil properties are something higher than real values of soils
Publication Year: 1999
Publication Date: 1999-01-01
Language: en
Type: article
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