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Shear wave velocity anisotropy of salt- and polymer-amended kaolinite |
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| Authors: | Kang X Cao J Bate B |
| Institution: | 1.Department of Geotechnical Engineering, College of Civil Engineering, Hunan University, Changsha, China ;2.Department of Civil, Architectural, and Environmental Engineering, Missouri University of Science and Technology, Rolla, USA ;3.Institute of Geotechnical Engineering, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, China ; |
| Abstract: | Shear wave velocity (Vs) anisotropy of kaolinite mixed with sodium chloride (NaCl) and organic polymer (polyethylene oxide, xanthan gum, and chitosan) solutions was investigated using a custom-made floating wall consolidometer-type bender element testing system. The addition of salt and polymers influenced the microfabric anisoopy of platy kaolinite particles, thus resulted in the increment or decrement in the Vs anisotropy. The Vs of kaolinite in all three orthogonal directions increased as the NaCl concentration increased; however, the Vs anisotropy decreased. PEO and chitosan increased the Vs of kaolinite, while xanthan gum exhibited counter-effects. Vs anisotropy (Vs?hh/Vs?vh and Vs?hv/Vs?vh) of polymer amended kaolinite was found to decrease. In addition, both salt- and polymer-modified kaolinite did not show Vs cross-anisotropy. |
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