VARDHAMAN COLLEGE OF ENGINEERING
(AUTONOMOUS)
B. Tech VI Semester Regular Examinations, May 2018
(Regulations: VCE-R15)
GEO TECHNICAL ENGINEERING-II
(Civil Engineering)
Date: 17 May, 2018 FN
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1.

What are the objectives of soil exploration? Explain.
7M
With the sketch of the soil sampler, Define: i. Area ratio ii. Outside clearance iii. Inside clearance
8M
2.
Explain various methods of borings adopted for soil exploration.
7M
Explain standard penetration test with the help of neat sketch.
8M
Unit II
3.

Explain the Method of Slices of determining the factor of safety of finite slopes.
8M

A slope 1 in 2 with a height of 8m has the following soil properties: γ=18 KN/m3, C=28KN/m2 and Φ=100. Calculate:
i. factor of safety with respect to cohesion
ii. Critical height of slope
7M
4.

A finite slope has failed in your city. What may be the possible causes? Explain any two of them briefly.
5M

An embankment has a slope of 1.5H 1V with a height of 9m and the soil properties are C=25kPa, Φ=200 and γ=18kN/m3. Determine the factor of safety for a trial slip circle passing through the toe using the method of slices. The Fellinius angles are α=260 and β=350. Use method of slices.
10M
Unit III
5.

Derive the equations of active and passive earth pressures.
5M
Discuss Culmann's method for the determination of active earth pressure.
10M
6.

Briefly explain any two types of retaining walls.
5M

Calculate the total lateral thrust and its location on the retaining wall of height 6 m high using the data given below:
For top 2.5m soil: Φ=360 and γ=18 kN/m3
For bottom 3.5m soil: Φ=320 and γ=17 kN/m3
Plot the variation of active earth pressure and locate the point of action of total active thrust.
10M
R
Unit IV
7.

What are different types of shallow foundations? Explain with neat sketches
8M

Compute the Safe bearing capacity of a continuous footing of 1.5m wide at a depth of 1.5m in a soil with γ=18 KN/m3, C=18KN/m2 and Φ=250. What is the safe load per metre run if factor of safety is 3. Take the values of Terzaghi's bearing capacity factors as Nc=25, Nq=12.5 and Nγ=10.
7M
8.

Differentiate between general shear failure and local shear failure.
7M

Discuss the effect of water table on the bearing capacity of soil.
8M
Cont…2
2
Unit V
9.

In what circumstances do you recommend the deep foundations for a structure? List the different types of piles based on the load transfer mechanism.
5M

There are 9 piles of 400mm diameter and 10m length driven into a sandy soil at 1m centre-to-centre in a 3x3 arrangement. If the soil has K=1.5 and γ=15.45kN/m3, calculate the load carrying capacity of the pile group using Factor of safety=2. Take Nq=10 and Nγ=5.39.
10M
10.

What are the functions of well foundations? Explain the different components of a Well foundation with a neat sketch.
8M

Briefly explain the different types and shapes of well foundations.
7M