Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) ) BE/BTech Civil Engineering (CE) 2020 March 7th and 8th Sem BTCE 812 Earth And Earth Retaining Structures Previous Question Paper
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech (Civil Engineering) (2012 to 2017) (Sem.?7,8)
EARTH AND EARTH RETAINING STRUCTURES
Subject Code : BTCE-812
M.Code : 71871
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.
SECTION-A
Q1. Answer briefly :
a. Zoned Dam
b. Downstream slope protection measures
c. Instruments to measure stress in earth dam and its foundation
d. Assumptions in Coulomb?s theory of earth pressure
e. Stability checks in gravity retaining walls
f. Influence of wall friction on passive earth pressure
g. Stability checks in coffer dam
h. Differentiate between rigid and flexible retaining structures
i. Types of Diaphragm walls
j. Pressure diagram on cantilever sheet pile embedded in cohesive soils
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1 | M-71871 (S2)-1485
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech (Civil Engineering) (2012 to 2017) (Sem.?7,8)
EARTH AND EARTH RETAINING STRUCTURES
Subject Code : BTCE-812
M.Code : 71871
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.
SECTION-A
Q1. Answer briefly :
a. Zoned Dam
b. Downstream slope protection measures
c. Instruments to measure stress in earth dam and its foundation
d. Assumptions in Coulomb?s theory of earth pressure
e. Stability checks in gravity retaining walls
f. Influence of wall friction on passive earth pressure
g. Stability checks in coffer dam
h. Differentiate between rigid and flexible retaining structures
i. Types of Diaphragm walls
j. Pressure diagram on cantilever sheet pile embedded in cohesive soils
2 | M-71871 (S2)-1485
SECTION-B
Q2. What are the basic design studies necessary for design of a earth dam?
Q3. Discuss in detail the Terzgahi?s filter criteria for its design.
Q4. For a layered backfill behind a 10m high retaining wall with a smooth vertical backfill,
Draw the active earth pressure distribution and its magnitude and point of application :
S. No. Depth Backfill properties
1. 0-3 m c = 30kN/m
2
, ? ?= 0?, ? = 19kN/m
3
2. 3-6m c = 0kN/m
2
, ? = 32?, ? = 18kN/m
3
3. 6-10m c = 50kN/m
2
, ? = 0?, ? = 17kN/m
3
Q5. A trapezoidal masonry retaining wall 1.5m wide at the top and 5m wide at its bottom is
5m high. The vertical face is retaining soil ( ? = 30?) at a surcharge angle of 15? with the
horizontal. Unit weights of soil and masonry are 20kN/m
3
and 24kN/m
3
.The coefficient
of friction at the base of the wall is 0.40. Check the stability of the retaining by applying
necessary checks if the soil bearing capacity is 90kN/m
2
.
Q6 The height of cantilever sheet pile from the top of dredge level is 8m. The water level in
the backfill is at 1m from top. Find the depth of penetration for a factor of safety equal
to 1. Assume that above the water table, the soil is dry. The other properties of soil are :
? = 32?, saturated unit weight 20kN/m
3
, G = 2.65.
SECTION-C
Q7. The retaining wall having 6m height having back of wall is inclined at +ve batter angle of
15? and ground surface has an upward inclination of 20? retains a backfill with following
properties : ? ?= 19kN/m
3
, ? = 34?, ? = 20?.
(a) Determine the total active thrust by Rebann?s graphical construction.
(b) A surcharge of 50kN/m
2
is acting on the backfill. What is the magnitude of total
active thrust?
Q8. A braced cut 3m wide 6m deep is proposed in moist sajid with ? = 38?. Sketch the
suitable scheme of sheeting , bracing and also determine the maximum sheet load.
Assume the density of soil as 18kN/m
3
.
Q9. What are different types of Coffer dams? Discuss in detail the step by step procedure for
design of a diaphragm type coffer dam.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 21 March 2020