By Braja M. Das
""...an first-class creation to complex thoughts of soil mechanics...easy to stick to by way of scholars and training engineers facing strategies to geotechnical problems...""
-Dr Sanjay Kumar Shukla, Edith Cowan college, Perth, Australia
""The options were defined in lucid demeanour that's of serious worth to scholars at undergraduate and postgraduate degrees. it really is a real asset for college and the examine workers.""
-Dr. Priti Maheshwari, Indian Institute of know-how Roorkee
""...an very good creation to complicated ideas of soil mechanics...easy to stick to via scholars and working towards engineers facing suggestions to geotechnical problems...""
-Dr Sanjay Kumar Shukla, Edith Cowan collage, Perth, Australia
""The thoughts were defined in lucid demeanour that's of significant worth to scholars at undergraduate and postgraduate degrees. it's a real asset for school and the examine workers.""
-Dr. Priti Maheshwari, Indian Institute of expertise Roorkee
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Extra info for Advanced Soil Mechanics, Fourth Edition
005(LL − 40)]— is the partial group index determined from the liquid limit. 01(F − 15) (PI – 10)—is the partial group index determined from the plasticity index. 59 yields a negative value for GI, it is taken as 0. 5 is rounded off to 4).
For a given value of Φ0 and x, the repulsive potential Φ decreases with the increase of ion concentration n 0 and ionic valence v. 14. 11 Variation of nondimensional potential with nondimensional distance. 12 Effect of cation concentration on the repulsive potential. 13 Effect of ionic valence on the repulsive potential. 14 Variation of Φ between two parallel clay particles. 15 Nature of variation of the nondimensional midplane potential for two paral lel plates. that at x = 0, Φ = Φ0, and at x = d (midway between the plates), Φ = Φd and dΦ/dx = 0.
High salt concentration will depress the double layer of clay particles and hence the force of repulsion. We noted earlier in this section that the Van der Waal force largely contributes to the force of attraction between clay particles in suspension. If the clay particles are suspended in water with a high salt concentration, the flocs of the clay particles formed by dominant attractive forces will give them mostly an orientation approaching parallelism (face-to-face type). 20a). Another type of force of attraction between the clay particles, which is not taken into account in colloidal theories, is that arising from the electrostatic attraction of the positive charges at the edge of the particles and the negative charges at the face.
Advanced Soil Mechanics, Fourth Edition by Braja M. Das