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Effect of High Suction Measurement Technique on the SWCC of Expansive Soil
The determination of soil water characteristics curve (SWCC) for any particular soil is very essential to understand the suction variation or negative pore water changes with drying or wetting and to obtain the unsaturated soil property functions accurately. In this study, SWCC of three different types of expansive soil with liquid limit ranging from 300 to 500% was measured using two different techniques, namely dew point potentiometer (WP4) and relative humidity sensor (RHS). Based on the measured result, the influence of the two measuring device on SWCC was quantified for different qualities of expansive soils. It was observed that the suction measured using WP4 technique corresponds to only the desaturation portion of the WRCC. The near saturation portion and the residual portion were not clear from the measured plots. The result obtained from the RHS corresponds to very low water content as compared to WP4 technique and gives almost a straight line path while a nonlinear trend was obtained for WP4 measurement. So, it is difficult to conclude which part of the WRCC corresponds to the RHS results. This aspect was studied by plotting the WP4 and RHS results together. It was found that the RHS results falls in the residual portion of the WRCC. Both the results merge exactly at higher suction above 104 kPa. So, it was seen that both WP4 and RHS results were essential to obtain the WRCC of expansive soil, and the combination of these two results will help to obtain desaturation and residual part clearly. The SWCC fitting parameters of Fredlund and Xing (Can Geotech J 31(3):521–532, 1994, [16]) and van Genuchten (Soil Sci Soc Am J 44(5):892–898, 1980 [17]) models were obtained using the experimentally obtained data for both WP4, RHS and combined WP4 + RHS and the possible variation was studied.
Effect of High Suction Measurement Technique on the SWCC of Expansive Soil
The determination of soil water characteristics curve (SWCC) for any particular soil is very essential to understand the suction variation or negative pore water changes with drying or wetting and to obtain the unsaturated soil property functions accurately. In this study, SWCC of three different types of expansive soil with liquid limit ranging from 300 to 500% was measured using two different techniques, namely dew point potentiometer (WP4) and relative humidity sensor (RHS). Based on the measured result, the influence of the two measuring device on SWCC was quantified for different qualities of expansive soils. It was observed that the suction measured using WP4 technique corresponds to only the desaturation portion of the WRCC. The near saturation portion and the residual portion were not clear from the measured plots. The result obtained from the RHS corresponds to very low water content as compared to WP4 technique and gives almost a straight line path while a nonlinear trend was obtained for WP4 measurement. So, it is difficult to conclude which part of the WRCC corresponds to the RHS results. This aspect was studied by plotting the WP4 and RHS results together. It was found that the RHS results falls in the residual portion of the WRCC. Both the results merge exactly at higher suction above 104 kPa. So, it was seen that both WP4 and RHS results were essential to obtain the WRCC of expansive soil, and the combination of these two results will help to obtain desaturation and residual part clearly. The SWCC fitting parameters of Fredlund and Xing (Can Geotech J 31(3):521–532, 1994, [16]) and van Genuchten (Soil Sci Soc Am J 44(5):892–898, 1980 [17]) models were obtained using the experimentally obtained data for both WP4, RHS and combined WP4 + RHS and the possible variation was studied.
Effect of High Suction Measurement Technique on the SWCC of Expansive Soil
Lecture Notes in Civil Engineering
Satyanarayana Reddy, C. N. V. (editor) / Saride, Sireesh (editor) / Haldar, Sumanta (editor) / Deka, Abhijit (author) / Vadlamudi, Srikanth (author) / Sekharan, Sreedeep (author)
2021-08-03
10 pages
Article/Chapter (Book)
Electronic Resource
English
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