By C. R. Scott B.A., M.I.C.E., M.I.Struct.E. (auth.)
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Additional info for An Introduction to Soil Mechanics and Foundations
The solute suction may be as much as one atmosphere (pF = 3) between the layers of a montmorillonite crystal, but seldom exceeds one tenth of this value (pF = 2) in the free water between the particles. In many cases, therefore, it is of small significance. Many of the methods used to measure soil suctions do not distinguish between the matrix and solute suctions. 12 Desaturation and resaturation: Consider a soil sample, initially saturated with water at zero pressure, and then subjected to an increasing suction.
40 INTRODUCTION TO SOIL MECHANICS AND FOUNDATIONS (b) The type of cation in the adsorbed layer. g. g. Ca 2+) since twice as many of the former are required to balance a given charge. Also, the water shell surrounding a sodium cation has a much larger diameter. The rate of diffusion of the ions out of the adsorbed layer depends on their size, so that this will also affect the thickness of the layer. 18 Base exchange: The type of cation in the adsorbed layers may be altered by altering the type of cation in the soil water.
1. For equilibrium where Tis the surface tension (per unit length of air/water interface). Then 2Tsin a r 2T where rm is the meniscus radius. It may therefore be seen that (a) Ua is always greater than uw, and (b) the pore pressure difference (ua - uw) increases with decreasing radius of the meniscus at the interface. The meniscus radius depends on the pore size. In sands, therefore, the pressure difference is relatively small, seldom exceeding 5 kNfm 2 • In clay soils, where the mean pore diameter is very much smaller, pressure differences of more than 10 000 kN/m 2 may occur.
An Introduction to Soil Mechanics and Foundations by C. R. Scott B.A., M.I.C.E., M.I.Struct.E. (auth.)