GATE CE 2022: Soil Mechanics & Foundation Engineering#16

Undisturbed soil samples are required for

A 300 mm square bearing plate settles by 15 mm in a plate load test on a cohesive soil when the intensity of loading is 0.25 N/mm². The settlement of a prototype shallow footing 5 m square under the same intensity of loading is:

Choose the correct sentence:

X: area ratio must be less than 10%

Y: inside clearance should be between 1 to 5 %

Z: outside clearance should be between 1 to 3%

During the subsurface investigation for design of foundation, a standard penetration test was conducted at 4.5 m below the ground surface. The record of number of blows is given as:
Penetration depth (cm) Number of blows
0 – 75 6
75 – 150 6
150 – 225 12
225 – 300 12
300 – 375 16
375 – 450 20
Assume water table at level of 1.5 m below G.L. and soil as fine sand and correction factor for overburden as 1.1, the correct N value for the soil would be

Boring method is to be chosen depending upon the type of exploratory strata. In this context, Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I
A) Auger boring
B) Wash boring
C) Percussion drilling
D) Rotary drilling

List-II
1) Partly saturated sands, silts and medium of stiff cohesive soils.
2) All types of soils and rocks except in stony or porous soils and fissured rocks.
3) Practically all types of soils except hard and commented soil or rock.
4) All types of soils and rocks. Difficult in loose sands and soft sticky clays.

During the subsurface investigations for design of foundations, a standard penetration test was conducted at 4.5m below the ground surface. The record of number of blows is given below.

Assuming the water table at ground level, soil as fine sand and correction factor for overburden as 1.0, the corrected ‘N’ value for the soil would be