CE-632 Foundation Analysis and Design. Instructor: Dr. Amit Prashant, FB 304, PH# 6054. E-mail: [email protected] Reference Books. Grading Policy. Two 60-min Mid Semester Exams ……. 30% End Semester Exam ……………........... 40% Assignment ……………………………… 10%
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Course Website: http://home.iitk.ac.in/~aprashan/ce632/
Typical Values of Parameters:
Particle size < 2 µm (.002 mm)
Kaolinite, Illite, Montmorillonite (Smectite)
- negatively charged, large surface areas
- e.g. finely ground quartz, feldspar or mica of "clay" size
- Valance, Size of Hydrated cation, Concentration
Thickness of double layer decreases when replaced by higher valence cation - higher potential to have flocculated structure
When double layer is larger swelling and shrinking potential is larger
Classification may be based on – grain size, genesis, Atterberg Limits, behaviour, etc. In Engineering, descriptive or behaviour based classification is more useful than genetic classification.
Where: K = hydraulic conductivity
∆h =difference in piezometric or “total” head
∆L = length along the drainage path
Definition of Darcy’s Law
Darcy’s law is valid for laminar flowReynolds Number: Re < 1 for ground water flow
where, i = hydraulic gradient =∆h /∆L
∆h = change in TOTAL head
Downward seepage increases effective stress
Upward seepage decreases effective stress
Determine the effective stress distribution with depth if the head in the gravel layer is a) 2 m below ground surface b) 4 m below ground surface; and c) at the ground surface.
Steps in solving seepage and effective stress problems:
Stress due to a Point Load
Concept of superposition may also be employed to find the stresses at various locations.
may be complex, expensive, several configurations
Consolidated Drained Test
Undrained Loading (f= 0 Concept)
Empirical Correlations for cohesive soils
Generalized Hook’s Law for cross-anisotropic material
Five elastic parameters