Field Estimates Strength Fine Soils

Question 1

S1

Answer 1

Consistency: Very soft
Aprox strength(kPa): less 25
Easily penetrated 5 cm by fist
SPT N less 2

Question 2

S2

Answer 2

Consistency: soft
Aprox strength(kPa): 25 -50
Easily penetrated 5 cm by thumb
N-SPT 2-4

Question 3

S3

Answer 3

Consistency: Medium
Aprox strength(kPa)
Penetrated 5 cm by thumb with moderate effort
N-SPT 4-8

Question 4

S4

Answer 4

Stiff
Aprox strength: 100 - 200 kPa
Readily indented by thumb but penetrated only with great effort
N-SPT: 15 - 30

Question 5

S6

Answer 5

Hard
Aprox strength: higher than 400 kPa
Indented with difficulty with thumbnail
N-SPT: higher than 30

Question 6

S5

Answer 6

Very stiff
Aprox strength: 200-400 kPa
Readily indented by thumbnail
N-SPT: higher than 30