Effect of porewater salinity on residual shear strength of clays and their mixtures
Published:January 01, 2016
L. He, B.-P. Wen, 2016. "Effect of porewater salinity on residual shear strength of clays and their mixtures", Developments in Engineering Geology, M. J. Eggers, J. S. Griffiths, S. Parry, M. G. Culshaw
Download citation file:
It has been long recognized that the residual shear strength of clayey soil is influenced by porewater chemistry due to physico-chemical interactions between clay and porewater. However, although the correlation between the residual shear strength of clayey soils and salinity of porewater has been discussed by many researchers, it has not been quantitatively specified either in theory or experiment. In this study, the residual shear strength of pure and mixed clays made of smectite, interlayered illite/smectite and kaolinite were investigated after being saturated with NaCl solutions of various concentrations. It was found that the residual shear strength of smectite significantly increased when the concentration of the NaCl was in the range of 0–1 mol L−1 and showed little change when the NaCl concentration was higher. The residual shear strength of kaolinite displayed insignificant change when NaCl concentration varied. Variation of the residual shear strength of interlayered illite/smectite with porewater salinity was quite similar to that of smectite, but with much less magnitude. Moreover, the residual shear strength of the clay mixtures also displayed great variation with the porewater salinity, and the variation may be mainly attributed to aggregation when porewater salinity varied as a result of change in double-layer thickness among clay particles.
Figures & Tables
Developments in Engineering Geology
Developments in Engineering Geology is a showcase of the diversity in the science and practice of engineering geology. All branches of geology are applicable to solving engineering problems and this presents a wide frontier of scientific opportunity to engineering geology. In practice, diversity represents a different set of challenges with the distinctive character of the profession derived from the crossover between the disciplines of geology and engineering. This book emphasizes the importance of understanding the geological science behind the engineering behaviour of a soil or rock. It also highlights a continuing expansion in the practice areas of engineering geology and illustrates how this is opening new frontiers to the profession thereby introducing new knowledge and technology across a range of applications. This is initiating an evolution in the way geology is modelled in engineering, geohazard and environmental studies in modern and traditional areas of engineering geology.