SUBJECT NAME : SOIL MECHANICS SUBJECT CODE : CE8491
YEAR / Branch : II/CIVIL SEMESTER : 04
DATE : TIME : 02.00 – 04.00 p.m.
DURATION : 2.00 HRS MAX. MARKS : 50
PART- A ( 5×2= 10)
Q.No Question Blooms
CO Marks
. Level
1. What are the different types of slope failure? C215.5 K1 2
Write the formula for finding factor of safety with respect to C215.5 K1 2
2.
Cohesion and friction.
3. Explain about the finite slope and infinite slope. C215.5 K1 2
4. Write the expression for FOS for cohesion. C215.5 K1 2
5. What are the factors leading to failures of slope? C215.5 K1 2
PART- B (5 × 8 = 40)
Q.No. Question Blooms
CO Marks
Level
1.a)
Explain the different types of slope failure with neat sketch. C215.5 K2 8
@
or
b) Explain about the friction circle method. C215.5 K2 8
Explain and derive the FOS of an infinite slope C215.5 8
2.a)
a. Cohesion less soil K2
@
b. C - ϕ soil.
or
An infinite sandy soil slope has a saturated unit weight of C215.5 K1 8
γsat=19.5kN/m3 and angle of internal friction ϕ = 35°.The
minimum factor of safety needed for the slope against is
b)
1.3.Find the safe angle of slope
a. When the slope is dry without seepage
b. If seepage occurs at and parallel to surface of the
slope.
Explain about the method of analysis of finite slopes and also C215.5 K2 8
3a)@
briefly explain the Swedish circle method.
or
Find the factor of safety with respect to cohesion of a clay C215.5 K1 8
slope laid at 1in 2 to a height of 10cm,if the angle of internal
b)
friction ϕ=10o ;C=15KN/m3 and γ=19KN/m3 .What will be the
critical height of the slope in this soil?
2 C215.5 K1 8
An earth slope of clayey soil having c=55kN!m and ϕ =0.
Corresponding to a trial Slip circle AB, we have the
following data :
4.a) i)Radius of slip circle=19m
@ ii)Weight of wedge ABD=2050kN
(iii)Distance of W fromA0=9m
iv)Angle subtend ed by the arc AB at the centre=64.5° .Find
the factor of safety against sliding along the slip surface.
or
A cut 9 m deep is to be made in clay with a unit weight of C215.5 K1 8
18 kN/m3 and cohesion of 27 kN/m 2. A hard Stratum exists
b) at a depth of 18 m below the ground surface. Find from
Taylor‟s charts if a 300 slope is Safe. If a factor of safety of
1.50 is desired,Find the safe angle of slope?
A canal with a depth of 5m has banks with slope 1:1 the C215.5 K2 8
properties of soil are C=20 kN/m2, ϕ = 15°, e = 0.7, G= 2.6.
5.a) Interpret the factor of safety with respect to cohesion.
a. When canal runs full and
b. It is suddenly and completely emptied.
or
An embankment of 10m high is inclined at 35°to the K1 8
horizontal. A stability analysis by method of slices gives the
following forces: Total normal forces = 900 kN; total
b)@ C215.5
tangential force = 420 kN; total neutral force= 200kN. If the
length of the failure arc is 23m, Find the FOS with respect to
shear strength. The soil has C=20 kN/m2 and ϕ = 15°.
