Foundation engineering course aims at providing engineering students in their senior year with the knowledge that enables them to designfoundation for engineering structures. this includes shallow and deep foundations. The design must be safe and economical and can be practically constructed.
soil sampling,disturbed and undisturbed samples
standard penetration test.SPT
cone penetration test.CPT
vane shear test
v-subsoil exploration report
i-ultimate bearing capacity
ii-general bearing capacity
iii-bearing capacity factors
iv-modification of bearing capacity equations for water table
3-foundation of special cases
i- foundation on rigid base at shallow depth
ii-bearing capacity for layered soils
stonger soil underlain by weaker soil
bearing caoacity of foundation on top of slopes
4-bearing capacity and foundation settlement
i-stess incease in soil below loaded area.approximate method for stres increase
ii-elastic settlement using theory of elasticity
iii-primary consolidation settlement
v-field load test
vi-tolerable settlement of buildings
iii-settlement of mat foundations
elastic and consolidation settlement
i-lateral earth pressure
ii-types of retaining walls
gravity wall,cantilever wall,counterfort wall
iii-stability of retaining wall against,overturning.stability,and bearing
iv-drainage of retaining wall
geotextile reinforcement,geogrid reinforcement
i-typesof piles,steel piles,concrete piles-plain concrete and reinforced
concretepiles-cast in place and precastpiles
iii-load transfer mechanism
iv-pile load capacity,point bearing capacity,frictional resistance
for sandy and fine grained deposits
v-pile load test
vi-elastic and consolidation settlement of piles
vii-pile driving formuls
viii-negative skin friction
ii-load capacity of group piles in sandy and clayey deposites
iii-consolidation settlement of group piles
principles of foundation engineering
by Braja M. Das
foundation analysis and design
evaluation and grading
1-there will be two mid term exams each carries 20 percent
2-homework and quizzes 10 percent
3-final exam 50 percent
Final Exam Example
Time; 3 hours
First semester 1429/1430
Answer all questions
a) List types of field tests.Explain one of them in some details.
b)What is the difference between disturbed and undisturbed soil samples?
c) Define recovery ratio and rock quality designation.How to classify rock
according to RQD ?
d)What is the purpose of subsoil exploration?
a) Define general shear failure, local shear failure, and punching shear
failure.Illustrate your answer with neat drawing.
b) A rectangular foundation L=1.5 B is to be placed at depth1.5m in
soil which has unit weight of 17 kn/m3 and saturated unit weight
18.5 kn/m3, c=25 kn/m2 and angle of friction=22.The water table is at
1.0 m below the ground surface.Find the width B and lenth L of the
foundation if the applied load is 400 kn and FS=3.
a) A square foundation 2m by 2m is acted upon by a load of 300kn
a moment of 150kn.m.Calculate and draw the pressure distribution
below the foundation
b) Find the allowable bearing capacity of a square foundation;
1.5m by 1.5 m resting on stong sand, unit weight of 18.5kn/m3
and angle of friction=35 underlain by soft soil with c2=50 kn/m2 and
angle of friction=0 assuming fs=3
for two cnditions;
1-sand layer thicknessis2m,and
2-sand layer thickness is 1m.
a) What are the types of settlement? Explain one of them in some
b) Asquare foundation 2m by 2m is placed on a soil profile as shown
below. Find the allowaple bearing capacity assuming the failure
surface is within the sandy layer. FS=3
c) Calculate the consolidation settlement in the silty clay layer. Use
the approximate method to find delta segma z
a) What the types of retaining walls? Draw neatly each type.
b) A cantilever retaining wall is as shown below. Determine
the factor of safety against overturning,sliding,and bearing
a) Expain how to install a pile into the soil. What are the different
methods that are used for this purpose?
b) Compare steel pile with reinforced precast pile.
c) A precast concrete pile is driven into soil , the profile of
which is shown in the fihure below. Calculate the pile load
capacity( frictional resistance and end bearing). assume F IS 4
Typical Mid -Term Exam
(a) What are the purposes of soil exploration program?
(b)Explain the Standard Penetration test .Use neat drawing to illustrate your answer. What are the type of samples obtained from this test?
(c) Draw the piston sampler.Compare this sampler with thin-walled tube sampler in obtaining undisturbed soil samples
(d)Define the rock recovery and RQD in rock sampling.
(e) Prepare a borehole log indicating all the necessary information that should be included.
a) What are the assumptions used by Terzaghi in the bearing capacity theory?
b)A rectangular foundation (2mby2m) is to be established on a soil at a depth of 1 m below the ground surface .Find the allowable colmn load that can be applied to the foundation using the folowing data
Dry unit weight 16.8 knlm3 saturated unit weight is 18.2 knlm3,cis 25 knlm2 angle of friction 24
(Note use the general bearing capacity equation assuming the water table is at the base of foundation Use FS 3.
a) Draw the different types of pressure distribution beloww an eccentrically loaded foundation .What is the pressure distribution mostly acceptable and why?
b)Find the alloable bearing capacity of a rectangular foundation (Bis 1m L is 2M) located at depth 1m below the ground surface for stronger saturated clay underlain by weaker saturated clay located at a depth H of .75m measured from the bottom of foundation
Top layer c is 150 knlm2
unit weight is 18.1
c is 50knlm2
unit weight is 16.2.