Name of the College : Ganesh College of Engineering
University : Anna University
Subject Code/Name : CE2305 Foundation Engineering
Dept : Civil Engineering
Degree : BE
Sem: IV
Website : ganeshenggcollege.org
Document Type : Question Bank
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/ganeshenggcollege.org/3363-ce2305-qb2.pdf
Ganesh College Foundation Engineering Question Paper
2 MARKS QUESTIONS & ANSWERS :
UNIT -1
1. What are components of total foundation settlement?
Elastic settlement, consolidation settlement, secondary consolidation settlement
2. What are the types of shear failure?
Related : Ganesh College of Engineering CE2203 Construction Techniques Equipment and Practice BE Question Bank : www.pdfquestion.in/3356.html
General shear failure, local shear failure, punching shear failure
3. What are assumptions in Terzaghi’s bearing capacity theory?
** The base of the footing is rough
** The load on footing is vertical and uniformly distributed
** The footing is continuous
4. List out the methods of computing elastic settlements?
Based on the theory of elasticity, Pressure meter method, Janhu –Bjerram method, Schmentmann’s method
5. What are the limitation of Terzaghi’s analysis?
** As the soil compresses, pi changes slight down ward movement of footing may not develop fully the plastic zones
** Error due to assumption that the resultant passive pressure consists of three components is small
6. Define ultimate bearing capacity?
Gross pressure at the base of the foundation at which the soil fails in shear is called ultimate bearing capacity.
7. Define net ultimate bearing capacity ?
Net pressure increase in pressure at the base of the foundation that causes failure in shear, is called as net ultimate bearing capacity
8. Define allowable bearing capacity?
It is the net loading intensity at which neither the soil fails in shear nor there is excessive settlement detrimental to the structure
9. Write the expression for correction due to dilatancy submergence?
Ne = 15 + ( No-15 )
10.What are the requirements for a stable foundation?
-must be safe from failure
-must be properly located
-must not settle or deflect sufficiently to damage the structure or impair its usefulness.
11. What are the factors which depends depth?
Type of soil, size of structure, magnitude of loads, environmental conditions, etc
12 .Define net pressure intensity ?
It is the excess pressure, of the gross pressure after the construction of the structure and the original overburden pressure.
13. What are the zones used in the Terzaghi’s bearing capacity analysis for dividing the failure envelope of the soil.?
Elastic equilibrium zone, Radial Stress zone, plastic zone
14. Write the ultimate bearing capacity equation for the general shear failure of soil in Terzaghi’s analysis for a strip footing.
qu = c Nc + _DNq + 0.5 _B N_
15. Define Shallow foundation.
If the depth of the foundation is less than its breadth, such foundation is known as shallow foundation.
UNIT -2
1.What are the information obtained in general exploration?
preliminary selection of foundation type depth of water, depth, extent and composition of soil strata engineering properties required disturbed or partly disturbed samples approximate values of strength and compressibility
2. Define significant depth?
Exploration depth, in general it should be carried out to a depth upto which increase in the pressure due to structural loading is likely to cause shear failure, such depth is known as significant depth.
3. What are the types of soil samples?
disturbed soil sample undisturbed soil sample
4. What is the difference between disturbed and undisturbed soil sample?
Disturbed soil sample Natural structure of soils get partly or fully modified and destroyed Undisturbed soil sample Natural structure and properties remain preserved
5. What are the disadvantages of wash boring?
It is a slow process in stiff soil It cannot be used effectively in hard soil, rocks ,etc.
6. What are design features that affect the sample disturbance?
Area ratio, inside clearance, outside clearance, inside wall friction, method of applying force
7. What are the corrections to be applied to the standard penetration number?
overburden pressure correction dilatancy correction
8. What are various methods of site exploration?
open exacavation, borings, geophysical methods, sub-surface soundings
9. What are the methods of boring?
auger borings, shell boring, wash boring, rotary boring, percussion boring
10. Define area ratio?
Area ratio is defined as the ratio of maximum cross sectional area of the cutting edge to the area of the soil sample
UNIT – 3
1. Under what circumstances, a strap footing is adopted?
When the distance between the two columns is so great, so that trapezoidal footing is very narrow and so it is uneconomical. It transfers the heavy load of one column to other column.
2. What is a mat foundation?
It is a combined footing that covers the entire area beneath a structure and supports all the walls and columns.
3. Where mat foundation is used?
It is used when the area of isolated footing is more than fifty percentage of whole area or the soil bearing capacity is very poor.
4. Define spread footing?
It is a type of shallow foundation used to transmit the load of isolated column, or that of wall to sub soil. The base of footing is enlarged and spread to provide individual support for load.
5. What are types of foundation?
shallow foundation , deep foundation
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Foundation engineering 5th sem