MCEGS201 Ground Improvement Techniques M.Tech Model Question Paper : mgu.ac.in

Name of the University : Mahatma Gandhi University
Department : Civil Engineering
Degree : M.Tech
Subject Code/Name : MCEGS 201/Ground Improvement Techniques
Sem : II
Website : mgu.ac.in
Document Type : Model Question Paper

Download Model/Sample Question Paper :
I : https://www.pdfquestion.in/uploads/mgu.ac.in/5257-1-MCEGS%20201%20Ground%20Improvemnt%20Techniques%20-set1.doc
II : https://www.pdfquestion.in/uploads/mgu.ac.in/5257-2-MCEGS%20201%20Ground%20Improvemnt%20Techniques%20-set2.doc

Ground Improvement Techniques :

M.TECH. Degree Examination :
Model Question Paper – I :
Second Semester :

Related : MGU MCEGS206-4 Earthquake Analysis & Design of Structures M.Tech Model Question Paper : www.pdfquestion.in/5263.html

Branch: Civil Engineering
Specialization: Geomechanics and Structures
MCEGS 201 Ground Improvement Techniques
(Regular – 2011 Admission onwards)
Time: Three Hours
Maximum: 100 marks
Answer all questions. :
1. Write short notes on
a) Vibro compaction piles
b) Preloading methods
c) Design of vertical drains (5+10+10 marks)
OR

2. What is a stone column? Discuss different construction techniques of stone column. How load carrying capacity is calculated? (25 marks)
3. a) Write a short note on types of grout and the desirable characteristics of a grout. (10 marks)
b) What is jet grouting? Explain the jet grouting process. Discuss the various application of jet grouting. (15 marks)
OR

4. a) What you mean by soil stabilization? Explain the principle and mechanism of lime stabilization. (15 marks)
b) Write short note on i) Applications of lime stabilization
ii) Mechanism of cement stabilization (10 marks)

5. Explain soil reinforcement. What is the mechanism? Explain reinforcement- soil interaction. Mention the various types of reinforcing elements. (25 marks)
OR

6. Design a reinforced earth retaining wall to retain 5 m height of fill material, which consist of sand ? = 18kN/m3, Ø = 40, FOS against tension and pullout failure can be assumed to be 2. No surcharge. The wall is designed using galvanized iron metallic strip as reinforcement. The properties of strip are as follows.

Width of strip = 10cm; thickness = 2mm; ultimate tensile strength = 24kN/m2; angle of friction between strip and soil = 28; Horizontal spacing of strips = 0.8 m; N? = 80 (25 marks)

7. An 8m high wall is to be built using sand fill and polymer-grid reinforcement. The sand has Ø’ = 30, ? = 18kN/m3 and is to be used for the wall and the backfill. A surcharge loading of 15kPa is to be allowed for; the maximum safe bearing pressure for the foundation soil is 300kPa.

Three grids of different design strengths are available: grid A at 24kN/m, grid B at 16.5kN/m and grid C at 10.5kNm (all having a bond coefficient fb of 0.9). The fill will be compacted in layers 250mm thick. Check the stability and design properly. (25 marks)
OR

8. a) Explain various types of geosynthetics. Explain the manufacturing process of geogrids. (15 marks)
b)Discuss the application of geosynthetics in i) Pavement construction ii) Environmental aspects.

MCEGS 201 Ground Improvement Techniques :
Answer all questions. :
1. Write short notes on
a) Dynamic compaction
b) Applications of a Vibro-float
c) Compaction piles
d) Sand drains with Preloading (5+5+5+10 marks)
OR

2. What is a stone column? What are the different construction techniques of stone column? How load carrying capacity is calculated? (25 marks)
3. a) What are the various types of grout injection methods? Explain any one with the aid of illustrative sketches. (10 marks)
b) Explain with neat sketches the various applications of grouting. (15 marks)
OR

4. a) What do you mean by soil stabilization? Explain the principle and mechanism of cement stabilization. (10marks)
b) Explain the chemistry of lime stabilization. How the optimum lime content decided. Write the applications of lime stabilization (15 marks)

5. (a) Explain soil reinforcement. What is the mechanism? Explain reinforcement- soil interaction. (15 marks)
(b) Explain the factors affecting behavior and performance of reinforced soil. (10 marks)
OR

6. A reinforced earth retaining wall to retain 12 m height of fill material, which consist of sand ? = 18kN/m3, Ø = 40, and steel reinforcement. FOS against tension and pullout failure can be assumed to be 2.There is no surcharge.

The top layer reinforcement is laid at a depth of 0.5m below ground surface and the bottom layer reinforcement is 0.5 m above the bottom of the wall. Given that yield stress in steel is 2.5×105 kN/m2; tand = 0.7 tan Ø, width of strip = 10cm;

Horizontal and vertical spacing of strips = 1 m; No. of reinforcement strips =12.Check the stability and find (a) the length Le of the strip reinforcement S10 such that the reinforcement will not slip out of the stable zone, and (b) the thickness, t, of the strip such that it will not rupture. (25 marks)

7. An 10m high wall is to be built using sand fill and polymer-grid reinforcement. The sand has Ø’ = 30, ? = 18kN/m3 and is to be used for the wall and the backfill. A surcharge loading of 15kPa is to be allowed for; the maximum safe bearing pressure for the foundation soil is 300kPa.

Three grids of different design strengths are available: grid A at 24kN/m, grid B at 16.5kN/m and grid C at 10.5kNm (all having a bond coefficient fb of 0.9). The fill will be compacted in layers 250mm thick. Check the stability and design properly. (25 marks)
OR

8. Explain various types of geosynthetics. Explain the functions and major applications of geosynthetics.