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Establishing soil-water characteristic curve and determining unsaturated hydraulic conductivity of kaolin by ultracentrifugation and electrical measurements

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Title Establishing soil-water characteristic curve and determining unsaturated hydraulic conductivity of kaolin by ultracentrifugation and electrical measurements
 
Creator RAO, BH
SINGH, DN
 
Subject kaolin
geotechnical centrifuge
electrical measurements
soil-water characteristic curve
unsaturated soil hydraulic conductivity
FINE-GRAINED SOILS
CENTRIFUGE
EQUATIONS
MOISTURE
 
Description To establish soil-water characteristic curves (SWCCs) of fine-grained soils, researchers have employed geotechnical centrifuges. However, most of these studies were confined to small acceleration levels and as a result the suction, psi, created in the soil mass was extremely low (< 100 kPa). Hence, researchers have resorted to ultracentrifuges, which are capable of generating psi approximate to 300 kPa. However, the volume of the soil mass used in these centrifuges is too small to be representative of field conditions and determination of moisture content of the soil specimen is done by invasive and destructive techniques. Under these circumstances, utility of electrical measurements (i.e., voltage across two points in the soil mass) for determining soil moisture content, which has the distinct advantage of being both nondestructive and noninvasive and facilitates development of the SWCC, seems to be quite promising. Validity of the technique has been demonstrated by comparing the resultant SWCC, for kaolin, vis-a-vis the SWCCs reported in the literature and those obtained from the pedo-transfer function (PTF). Further, unsaturated hydraulic conductivity (k(u)) of the kaolin was determined by employing various PTFs available in the SoilVision database and using the relationship proposed by Corey in 1977. It has been observed that the k(u) values obtained from these relationships match extremely well for psi
 
Publisher CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS
 
Date 2014-10-15T12:04:57Z
2014-10-15T12:04:57Z
2012
 
Type Article
 
Identifier CANADIAN GEOTECHNICAL JOURNAL, 49(12)1369-1377
http://dx.doi.org/10.1139/cgj-2011-0341
http://dspace.library.iitb.ac.in/jspui/handle/100/14859
 
Language en