Soil Mechanics II
Three Credit Hours
Soil Classification and Physical Properties
and General Mechanical Behavior of Soil
2. Permeability and Seepage
Coefficient of Permeability
Constant Head Permeability Test
Falling Head Permeability Test
Field Permeability Test
Equation of Continuity
Flow Net and Rate of Flow
3. Stress in a Soil Mass
Normal and Shear Stresses Along a Plane
Principal Stress and Principal Plane
Stress Due to a Point Load
Stress Due to a Live Load
Stress Due to a Strip Load
Stress Due to a Circular Load
Vertical Stress Caused by Rectangular Load
New Mark Channel
4. Compressibility of Soil
Normally Consolidation and Over Consolidation Clays
Rate of Consolidation, Terzaghi Theory of Consolidation
Flexible and Rigid Foundation
5. Shear Strength of Soil
Mohr-Coulomb Failure Criterion
Determination of Shear Strength Parameters
Direct Shear Test, Triaxial Compression Test
Field Shear Test (Vane Shear Test, Penetration Test)
6. Lateral Earth Pressure
Earth Pressure At-Rest
Active Earth Pressure
Passive Earth Pressure
Coulomb's Earth Pressure Theory
Graphic Solution of Coulomb's Method
Retaining Walls, Pressure Distribution and Stability of Retaining Wall
7. Slope Stability
Stability of Infinite Slopes
Circular Failure Surface
Method of Slices
There will two midterm exams each carries 20% and homework 10%. The final carries 50%.
"Principles of Geotechnical Engineering by Braja M. Das
a)Draw Mohr circles for both the avtive and passive earth pressure for the given failure envelope.
b)A frictionless retaining wall is shown below. Draw the pressure distribution for both the active and passive cases ,and find the active and passive forces per unit length of the wall due to the surcharge q only
For the retaining wall shown below. Determine the active force per unit length of the wall for Rankine state.Also, find the location of the resultant.
a)For the infinite slope shown below,find the factor of safety against sliding along the planeAB
b)if there were seepage through the soil, and the ground water table coincided with the ground surface,what will be the value of the factor of safety(assume the unit weight is 18.5Kn/m3)
a)List two disadvantages othe direct shear test.
b)State the assumptions made in the ordinary method of slices.
c}From the figure,determine the copression index
d)Draw Mohr cicle for the unconfined copression test.Show and write relationship between the undrained shear strength and the unconfined copression strength.
For the soil profile shown below caculate the consolidation settlement for the following cases
i) The precopression pressureis 70 knlm2
ii)the precopression pressure is 100 knlm2
Laboratory test on a clay sample of thickness 19 mm(drained at the top and bottom)indicated that the time for 50 percent consolidation is 40 minutes
(a) Find the time for a clay layer in the field(similar to the soil sample)of a thickness of 2m to undergo 50 percent consolidation that there is a rock statum at the bottom of the clay layer
(b)Finf the time for the clay layer(described in part a) to reach 80 percent consolidation.
(a) Write down Mohr -Coulomb failure criterion(shear strength equation),Define each term
(b) A consolidated undrained triaxial test on normally consolidated clay yielded the following results
Confined pressure is 90 knlm2
Deviator stress is 60 knlm2
Pore pressure is 40 knlm2
Find the shear strength parameters in terms of total and effective stresses What will be the normal stress and shear strength at failure?
(a) State the main difference between Rankine and Coulomb theory for lateral earth pressure.
(b) For the retaining wall shown ,plot the active pressure distribution and determine the active pressure force and its location
For the slope shown below ,determine the factor of safety with respect to strength.
There are several books which can be use as an alternative text book or reference book in geotechnical engineering.