Foundation Engineering

Set I

Differentiate disturbed and undisturbed samples.

What are the limitations of Static Cone Penetration test?

What are the modes of failure of shallow foundations?

List various methods of minimising total and differential settlement.

When does straps footing preferred?

Draw the contact pressure distribution diagram below rigid footing resting on clay and sand.

State Feld's rule for determining group capacity of pile groups.

What is under reamed pile? When is it preferred? Draw the variation of lateral earth pressure with wall movement.

Why SPT "N" values recorded in sand at different depths are corrected for

are applied? (8)

overburden and submergence? How these corrections

(i) Explain wash boring method of advancing bore hole.

(8)

(b)

sampler. State

OR

(i) Explain the arrangements and operation of stationary piston its advantages over other samplers.

(8)

(ii) Explain in detail the salient features of bore log report.

(8)

2

(a)

(0) Determine the ultimate bearing capacity of a strip footing. 1.5 m wide, with its base at a depth of Im, resting on a dry sand stratum. Take 7 17 kN/m: 6-38: Use IS code method. For 38, N-48.9 and N-56.2

(1)

A strip footing of 1.5 m wide, resting on a sand stratum with its base at a depth of Im. The properties of the sand are: y 17 kN/m², Y-20 kN/m. - 38 and 0. Determine, the ultimate hearing capacity of the footing using Terzaghi's theory if the ground water table is located at a depth of 0.5m below the base of the footing. For - 38°. assuming general shear failure N 60 and N-75.

(i) A group of nine piles, 12 m long and 250 mm in diameter, is to be arranged in a square form in a clay soil with an average unconfined compressive strength of 60 kN/m². Work out the center to center spacing of the piles for a group efficiency factor of 1. Neglect bearing at the tip of

the piles.

(10)

(1) Discuss the method of obtaining ultimate load and also allowable load on a single pile from pile load test.

(6)

15. (a) Explain Culmann's, graphical method for determining active lateral earth

pressure on rigid retaining wall.

(16)

OR

(b) Explain Rankine's theory for active and passive earth pressures on rigid wall cohesive soil. Consider both presence and absence of tension crack for active cene

Set II

What is mean dilatancy?

Write the uses of bore hole report

What is the allowable maximum settlement of commercial Industrial and ware house building?

What is the ultimate hearing capacity of a circular footing of 15 in diameter resting on the surface of a saturated clay of unconfined compressive strength of 100 Nie Take N-57, N, LN6 DO

Last out the types of footing

Write the componenta al total settlement?

What are the methods available to determine Load curing capacity of pale?

For pde designed for an allowable fond of 400 kN driven by Steam hammer (Single acting) with a hegy what is the appetuate terminal set of pile?

Define surcharge angle

(al Explain in detail about the geophysical method of site waploration with

nest sketch

Or

(b) Write short noted on

Selection of Foundation hased an sail condition

(1)Disturbed and Undisturbed anal sample

(4)

6) Uses of soil Exploration.

(a) A strp footing 2 m wide carries a loud intensity of 560 KN/m at a depth of 12 m in sand. The saturated unit weight of sand is 18 kN/m and unit weight have a water table is 16.8 kN/m

The shear strength parameters are CO and determine the factor safety with respect to ahoor failure for the following care of

location of water table

Water table is 2s below ground level (Water table at G.Litself level

(Water table in 4 m below ground level

(iv) Water tahle is 0.5 m below level

(b) Explain in detail about 15 cade method for computing the bearing capacity of soil with various types of Exilure and shape factor.

(a) Discuss in detail about the design producer for Rectangular combine footing and Trapezoidal combine footing with suitable sketch.

Or

(b) Write brief notes on:

G Mat Foundation

Floating Foundation () Seismic force consideration in footing design

34 (4) Explain in details about the various types of gile foundation with neal sketch and write their functions

Or

Write short notes on

01 Negative skin friction

(5)

01) Under reared piles

(iv) Settlement of pile group in clay

6) Under reared piles Piles Cap

Explain in details about the CUL MANN's graphical method for finding

active pressure with a neat sketch

Or

(b)

Discuss in detail about the Rankines theory for the following cases of cohesions soil and cohesive soil.

Submerged back fill

(8)

(ii) Back fill with sloping surface.