Geo-technical Engineering II - Well Foundations

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Advanced Surveying

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Geotechnical Engineering II - Question Bank

LAB MANUAL

Geotechnical Engineering – II

Unit 5:

1. It is proposed to lay a suitable type of foundation at a depth of 1.50m below the GL on soil a c-Φ soil with c=30 Kpa and Φ=25°, γ=17.50 kN/cum. Given Nc’=14.80; Nq’=5.60; Nγ’=3.20. Estimate the ultimate bearing capacity of a (i) 2m wide strip footing, (ii) 2m wide square footing, (iii) 2m wide circular footing. Comment on the results.

2. A 2m wide square footing is laid at a depth of 1.20 m below the GL on a c-Φ soil with c=40 Kpa and Φ=20°, γ=17 kN/cum. Given Nc’=11.80; Nq’=3.90; Nγ’=1.70. Using Terazaghi’s theory, compute the ultimate bearing capacity when the GWT is

(i) 5m below GL (ii) 2m below GL (iii) at GL.

Assume the change in shear parameters due to saturation is negligible.

3. Explain the types of shear failures experienced by shallow foundations. Mention the parameters to decide type of shear failure.

4. A continuous footing of width 2.5m rests 1.5m below the ground surface in clay. The unconfined compressive strength of the clay is 150kN/m². Calculate the ultimate bearing capacity of the footing. When there is no effect of water table and when water table reaches ground surface. Take γ=19kN/m³, γsat=20kN/m³

5. What is a strip footing? When it is preferred?

6. List out different types of foundations. State the circumstances to go for combined foundations

7. A continuous footing of width 2.5m rests 1.5m below the ground surface in clay. The unconfined compressive strength of the clay is 150kN/m². Calculate the ultimate bearing capacity of the footing. When there is no effect of water table and when water table reaches ground surface. Take γ=19kN/m³, γsat=20kN/m³.

8 Define the following:

i) Net ultimate bearing capacity.

ii) Unit soil pressure.

iii) Allowable bearing capacity.

9. A square footing 1.8mx1.8m is placed over loose sand of bulk density 1.6g/cc, saturated density 1.82g/cc and at a depth of 0.8m. The angle of shearing resistance is 300. Determine the ultimate bearing capacity when there is no effect of water table and when it is submerged (for φ= 300, Nc=30.14, Nq=18.4 and Nγ=15.1).

10. Differentiate between Safe bearing Capacity and Allowable bearing capacity.

Unit 6:

1. Distinguish between immediate and consolidation settlements. What are the limits of maximum and differential settlements according to I.S. codes?

2. A raft foundation of size 20m X 30m exerts a uniform pressure of 180kN/m² on sub soil. Determine the immediate settlement of soil by assuming E= 45Mn/m² and poisons ratio 0.5.

3 Discuss the situations for adopting the SPT test for determining the bearing capacity.

4. Determine the allowable bearing capacity of a 1.5m X 1.5m square footing placed at a depth of 2.0m in a sandy deposit having a unit weight of 19kN/m3 with SPT value of 37. Water table is at depth of 1.5m. Determine the allowable bearing capacity for 50mm permissible settlement after applying suitable corrections for SPT value.

Unit 7:

1. A 300mm dia. Pre-cast RCC pile is driven in to a clay bed to a depth of 9m. The average properties of the clay along the shaft of pile include, c = 40 kPa; α = 0.74. However, the un-confined compressive strength of clay at tip of the pile was found to be 120 kPa. Estimate the safe load carrying capacity of the pile with a FOS of 3.

2. Explain the construction and use of “Under-reamed Pile foundations”.

3. A group of 20 piles, arranged in 4x5 pattern are provided in a Clay deposit to a depth of 12m.The size of each pile is 600mm dia provided at a c/c spacing of 1.80m. The average properties of the clay are qu=160kPa, adhesion factor=0.58. Determine the safe load carrying capacity of the pile group. Adopt FS=2.50.

4. Give classification of piles.

5. A group of 15 piles of 450mm diameter each are arranged in 3 x 5 pattern to a depth of 9m in a 16m thick medium stiff clay. The average unconfined compressive strength of clay is found to be 120 kPa. The adhesion factor between concrete and in-situ clay is found to be 0.58. Estimate the safe load carrying capacity of the pile group with an overall factor of safety of 3.0, if the center to center spacing of piles is 0.9m

6. Write a note on “Dynamic formulae” and comment on their validity

7. A R.C.C. pile of size 30cm X 30cm and 10m long is driven into coarse sand with unit weight of 16kN/m³ and angle of internal friction of 31⁰. What is the allowable load on the pile? For φ=31⁰, N q= 16 and N γ = 14.Take K=1.0 and factor of safety of 3.0.

8. What is negative skin friction in piles? Explain.

9. Sketch an open well foundation and show the various components. Explain the functions of various components

10. Explain the “Pile Load Tests” in detail

Unit 8:

1. Describe various types of Caisson Foundations and comment on their suitability.

2 Explain in detail the procedure of “Sinking of Well foundations”.

3. With the help of a neat sketch, show the components of an “Open Caisson” and explain the function of each component.

4. With the help of neat sketch, show the components of a “Pneumatic Caisson” and explain their function. Also explain the procedure of sinking of “Pneumatic Caissons”.

ArcGIS Lab - Excercise

ArcGIS LAB:

Steps:

1.      Create Project using ArcCatalog

1.1.           Programs à ArcGIS à ArcCatalog

1.2.           Create New Folder (eg. 5-13)

1.3.           Copy .jpg file into Project Folder

1.4.           Open ArcMap

1.5.           Add .jpg File (using AddData Option)

2.      Geo-reference the Raster File

2.1.           View à Toolbars à Georeference

2.2.           Zoom In to Left-Top Corner

2.3.           Select Add to Control Point from Toolbar

2.4.           Click on Co-ordinate Point

2.5.           Right Click à Select “Input X Y”

2.6.           Type Lat/Longs (1 Degree = 60 Minutes) àOK à Zoom Extent

2.7.           Continue for all other corners

2.8.           Select Georeference Tool à Rectify à Save

3.      Create Layers (using ArcCatalog)

3.1.           Roads

3.1.1.                 Select Folder à New à Shape File à Roads à Polyline à Edit à Select à GCS à World à WGS_1984.prj  à Add à Apply à OK à OK

3.1.2.                 Open Roads.shp into ArcMap

3.1.3.                 Remove .jpg file

3.1.4.                 Add .img file

3.2.           Village

3.3.           River

3.4.           After adding all layers, save the project (.mxd)

     

II Year - Survey Lab Manual

Download Survey Lab Manual

IV Year - Mini Project

Presentation Guidelines:


Download PPT Template


Submit Project Report (1 Copy - Spiral binding). 


After review and making necessary changes, Student has to submit individual copy + 2 additional copies (one for department, one for library)


Include Data Sheets:

• Concrete Mix Design Specifications for M20, M25, M30, M35, M40, M50
• Market Rates for Sand, Cement, 12mm, 20mm, 40mm Metal
• Material Requirement factors eg., Cum of Sand per 1 Cum of RCC
• Labour Charges per sft for Construction, Earthwork, and Refilling
• Weight of Steel per Metre Length for various dia.: 8mm, 10mm, 12mm, 16mm, 20mm, 25mm, 32mm

Templates:

Detailed Estimate
S.No	Item of work	No's	L	B	D/H	Quantity

Abstract Estimate
S.No	Item of work	Quantity	Rate	Per	Amount

BBS - Calculation
S.No	Item of Work	Type of Bar	No's	L	Total Length	Dia. Of bar	Kg/Meter	Total Weight

Material Requirement Statement
S.No	Item of Work	Quantity	Cement	Sand	12mm Metal	20mm Metal	40mm Metal	CR Stone

IV YEAR - ArcGIS Lab Material

All students are requested to submit ArcGIS Lab Record on or before 22-Nov-2011. It should contain work you have done during LAB hours.

• Toposheet (.jpg file)
• GIS Data Layers - Villages, Roads, Rivers (Shape data)
• Summary data: Length of Roads, Rivers, Area of Lakes etc.,

Download Tutorial File (2 to 32 Pages)

Time Table for LAB INTERNAL EXAMS

TIME TABLE
IV Year:
Batch	LAB	Lab Incharge	Date		Time
I	CT & TE	Sai Bhargavi, Uma Radha	23-Nov-11		10AM - 12.30PM
II	GIS & CAD	Rambabu, Vineeth Thomas			1.30PM - 4.00PM
I	GIS & CAD	Rambabu, Vineeth Thomas	25-Nov-11		10AM - 12.30PM
II	CT & TE	Sai Bhargavi, Uma Radha			1.30PM - 4.00PM
III Year:
Batch	LAB	Lab Incharge	Date		Time
I & II	Engineering Geology	Arati Reddy	19-Nov-11		10AM - 12.30PM
I	FM & HHM	Ram Gopal Verma	22-Nov-11		1.30PM - 4.00PM
II	FM & HHM	Ram Gopal Verma	26-Nov-11		10AM - 12.30PM
II Year:
Batch	LAB	Lab Incharge	Date		Time
I	Surveying	Rambabu, Ghouse Mohiuddin	22-Nov-11		1.30PM - 4.00PM
II	SM Lab	Uma Radha, Vineet Thomas
I	SM Lab	Uma Radha, Vineet Thomas	24-Nov-11		1.30PM - 4.00PM
II	Surveying	Rambabu, Ghouse Mohiuddin