FUNDAMENTALS OF GEOTECHNICAL ANALYSIS During a Standard Penetration Test on silty clay soil, blow counts of 7, 11 & 16 were recorded for the 1st, 2nd, and 3rd, with 6-inch intervals of an 18-inch split spoon. a) What is the N value? and, b) What is the consistency of the soil?
FUNDAMENTALS OF GEOTECHNICAL ANALYSIS During a Standard Penetration Test on silty clay soil, blow counts of 7, 11 & 16 were recorded for the 1st, 2nd, and 3rd, with 6-inch intervals of an 18-inch split spoon. a) What is the N value? and, b) What is the consistency of the soil?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
FUNDAMENTALS OF GEOTECHNICAL ANALYSIS
During a Standard Penetration Test on silty clay soil, blow counts of 7, 11 & 16 were recorded for the 1st, 2nd, and 3rd, with 6-inch intervals of an 18-inch split spoon.
a) What is the N value? and,
b) What is the consistency of the soil?
Transcribed Image Text:SAMPLING METHODS
PENETRATION RESISTANCE
AS
auger sample
cored sample
direct push
field vane
Standard Penetration Test (SPT) resistance ('N' values) is defined as the number of
blows by a hammer weighing 63.6 kg (140 lb.) falling freely for a distance of 0.76 m (30
in.) required to advance a standard 50 mm (2 in.) diameter split spoon sampler for a
distance of 0.3 m (12 in.).
CORE
DP
FV
grab sample
split spoon
shelby tube
wash sample
GS
Dynamic Cone Test (DCT) resistance is defined as the number of blows by a hammer
weighing 63.6 kg (140 lb.) falling freely for a distance of 0.76 m (30 in.) required to
advance a conical steel point of 50 mm (2 in.) diameter and with 60° sides on 'A' size
drill rods for a distance of 0.3 m (12 in.)."
ST
ws
COHESIONLESS SOILS
COHESIVE SOILS
COMPOSITION
Undrained Shear
Compactness
Consistency
'N' value
Term (e.g)
% by weight
'N' value
Strength (kPa)
<2
2-4
4 -8
8 – 15
15 – 30
> 30
< 12
12 - 25
25 – 50
50 – 100
100 – 200
> 200
very loose
loose
compact
dense
very dense
< 4
4 – 10
10 – 30
very soft
soft
trace silt
some silt
silty
sand and silt
< 10
10 – 20
20 – 35
> 35
firm
30 – 50
stiff
> 50
very stiff
hard
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