This document appears to be an exam for a Geotechnical Engineering course. It contains 9 multi-part questions testing students' knowledge of topics like soil sampling techniques, bearing capacity, slope stability, earth pressure, pile foundations, and more. Students are asked to define terms, briefly describe concepts, differentiate between ideas, and perform calculations to solve engineering problems related to foundations and retaining structures. The exam aims to evaluate students' understanding of key geotechnical engineering principles through questions ranging from conceptual to applied/calculations based.

1. Subject Code
R11CED1125 R11
VNR VIGNANA JYOTHI INSTITUTE OF ENGINEERING AND TECHNOLOGY
(AUTONOMOUS)
B.Tech. III Year II Semester Supplementary Examinations, July, 2014
GEOTECHNICAL ENGINEERING -II
(CE)
Time: 3Hours Max. Marks: 70M
PART- A
1. Answer in one sentence 5X1=5M
a) Area Ratio
b) Infinite Slope
c) Cantilever Retaining wall
d) Allowable bearing Pressure
e) Friction Pile
2. Answer the following very briefly 5X2=10M
a) Boring Log
b) Taylors Stability Number
c) Earth pressure at rest condition
d) Expansive Soil
e) Efficiency of group of piles
3. Answer the following briefly 5X3=15M
a) Reconnaissance survey
b) Types of slope failures
c) Assumptions made in Rankin’s Active earth pressure
d) Measures to reduce settlement
e) Negative skin friction
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2. PART- B
Answer any FOUR questions 4X10=40M
4. a) Differentiate between disturbed and undisturbed soil samples? What are the factors that affect the
sample disturbance?
b) Discuss Standard Penetration Test. What are the various corrections?
5. a) Describe Plate load test. What are its limitations?
b) Find the Gross safe bearing capacity of strip and square footing in a saturated clay with the following
properties.
Unit weight of Clay=20kN/m3
, Depth of footing=1.0m, Factor of Safety=2.0
Breadth of footing=1.0m, Unconfined Compressive Strength =20 t/m2
6. a) What are different types of settlements which can occur in a foundation? Explain
b) Write short note on Under-reamed pile foundation
7. a) What are the design criteria to be satisfied for the stability of a gravity retaining wall? Indicate
briefly- how you will ensure the same.
b) A smooth backed vertical wall is 6.3m high and retains a soil with bulk unit weight of 18kN/m3
and
φ=180 .
The top of the soil is level with top of the wall and is horizontal. If the soil surface carries a
uniformly distributed load of 45kN/m2
.Determine the total active thrust on the wall per linear metre of
the wall and its point of application.
8. a) What are different types of factor of safety used in the stability of slopes
b) A slope is to be constructed on a soil for which c=0 and φ =360
.It is to be assumed that water level
may occasionally reach the surface of slope, with seepage taking place parallel to the slope. Determine
the maximum slope angle for a factory of safety of 1.5. Assuming a potential failure surface parallel to
slope. What would be the factor of safety of slope, constructed at this angle? If water table should be
well below the surface.
9. a) Describe various types of pile foundations.
b) A square group of 9 piles was driven into soft clay extending to a large depth. The diameter and
length of piles were 30cm and 9m respectively. If the unconfined compressive strength of clay group is
9 t/m2
and the pile spacing is 90cm c/c. What is the capacity of group? Assume a factory of safety of
2.50 and adhesion factor of 0.75.
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