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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?

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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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? 

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
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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