Specimen Preparation Techniques for Testing Fully and Partially Saturated Sands in Dynamic Simple Shear (DSS) Test Device with Confining Pressure
In this study, specimen preparation techniques for testing fully and partially saturated specimens were investigated. Various techniques were evaluated for obtaining loose to dense fully saturated sand specimens in a flexible membrane of DSS-C device, with minimal distortion to the specimen. Moist undercompaction technique in stages and then saturation with back pressure seem to be the best technique for obtaining loose to dense fully saturated uniform sand specimens. Gas/air entrapped partially saturated sand specimens were prepared by using a chemical powder: sodium percarbonate. The powder was mixed with water and predetermined amount of dry sand was rained into this solution. The chemical powder gets into reaction with water and generates oxygen gases which get entrapped in the sand voids. The techniques developed for obtaining uniform, repetitive sand specimens practically were discussed herein. The specimens prepared were tested under undrained conditions in Dynamic Simple Shear with Confining Pressure (DSS-C) testing device.
KeywordsSaturated Sample Saturated Sand Sand Specimen Loose Specimen Chemical Powder
This research is funded by TUBITAK (The Scientific and Technological Research Council of Turkey) under the grant No: 213M367. The support of TUBITAK is greatly appreciated. The support of VJ Tech Limited and DOTEK during and after the installation of DSS-C device is greatly appreciated. The authors present their gratitude to VJ Tech Technical Support Employee Prash Jeevagan and George Nikitas for their instant support. The support of Mr. Binaya Bhattarai is also greatly appreciated for the problems faced during the specimen preparation process. The authors also would like to thank our colleagues at ITU especially Dr. Mustafa Hatipoglu, Dr. Atila Sezen and Prof. Recep Iyisan for their guidance and support during our tests. Finally, the support of Istanbul Technical University in bringing the DSS-C device into our laboratory is greatly appreciated.
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