Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 5th Semester (Fifth Semester) 2018-2019 RCE 501 Geotechnical Engineering Question Paper
puma: Ron N... I?T?I?T?I?m
KTECH.
(SEM V) THEORY EXAMINATION 2018-19
GEOTECHNICAL ENGINEERING
Time: 3 Hours T atal Marks: 70
Note: 1. Attempt all Sections. If require any missing data; then choose suitably.
SECTION A
l. Attempt all questions in brief. 2 x 7 = 14
a Define origin of soil.
b. Draw the ?gure of element separated Soil Into three phases.
c. Compute the range for capillary rise in silt deposits.Assume value of void ratio
as 0.7.
d. De?ne Analogy method by Laplace equation.
e What are the preconsolidated stress?
f. De?ne undrained shearing strength
g. What are the Limitations of Coulomb?s IhCOfyqu': .-
SECTION II " 1 ,
2. Attempt any three of the following: ? a 4
a, What IS the use of particle size distnbution curve. " with the help of pamciersme
distribution curve ' ~_
b. The speci?c gravity of. soil solids fo. a given soil sample was determined by
density bottle methqd using kcmsene, Foliowmg observations were recorded
Compute the speCI?c gravity of soil solids at test temperature which was
maIntamcd at 27": Also report the value at 4? C. Take speci?c gravity of
kerosene at 279 C as 0 733
c Define the terms (i) Quick sand conditmn (II) Exit gradient (ii) UU Test
d In the laboratory 3 2 cm thick soil sample takes} 25 minutes to reach 30%
degree of consolidation. Find the time taken f9! 2) 5 m thick clay layer In ?eld
to reach 40% consolidation . Assume doubic drainage both cases.
C. Using the Rankines theory. the totral active thrust on a vertical wall 10 m high ,
II' the soil retained has the following gfw?rtics (b=?35? ~y=19kN/m3
SECI?I'OIQ C
3. Attempt any one part of the followmg: 7 x l :- 7
(a) The plastic limit of am? Is 24% and Its plasticity index 15 8 % When the soil
is dIIed from its state :{II plastic limit, the volume change Is 26% of Its volume
oI plastic limIt . The corresponding volume change from liquid limit to dry
state is 35% of its volume of liquid limit I determine the shrinkage limit and the
shrinkage I?atiuov
(bl De?ne clay minerals. Also discuss Mommoriilon::e with neat sketchces.
4. Attempt any one part of the following: 7 x 1 - 7
(3) Explain calelary siphoning With neat sketchAnd alkso discuss about partially
. satm'ated soils
(bi What are the assumptions and Limitations oI'DupuILs ?s theory
,1"),
5. Attempt any one part of the following: 7 x l = 7
(a)
(b)
Find out the expression for the law of de?ection of ?ow line at the interface of
two dissimilar soils.
Write the difference between compaction and consolidation. The in situ void
ratio of a granular soil deposits is 0.50 . The maximum and minimum soil ratio
of the soil were determined to be 0.75 and 0.35. Gs=2.61 also determine the
relative density and relative compaction of the deposit.
6. Attempt any one part of the following: 7 x l - 7
(a)
(b)
In a consolidation test , the void ratio of the specimen which was 1.068 under
the effective pressure of 2M kN/m2 , changed to 0.994 when the pressure was
increased to 429 kN/m2 . calculate the coef?cient of permeability ,
compression index i Also find the settlement of foundation resting on above
type of clay, if thickness of layer is 8 m and the increase in pressure is 10
kN/m2_
A rectangular area 2mx4m carries a uniform load of 8 t/m2 at the ground
surface . ?nd the vertical pressure at 5 m below the centre and corner of the
loaded area
7. Attempt any one part of the following: 3:: 7 x 1 - 7
(a)
(b)
A group of 16 piles of 600 mm diameter Is arranged in a square pattern with clc
spacing of 1.2 m the pilkes are 10 m lgng arid are embedded in soft clay with ,
cohesion of 30 lcN/mz Bearing resistance may be neglected for the phasing?
Adhesion factor is 0. 6. detenninenitlmate load carrying capacity of the p'tie ?
group
What are the cased cast-in ?s'tu: eoncrete piles Explain any two of them With
neat sketches <31,
w
H
x.
1?
This post was last modified on 29 January 2020