Civil Engineering PE

Category - Subsurface

When classifying a soil using the Unified Soil Classification System, what can be assumed for a given soil sample based on the following sieve analysis results?
Sieve: Percent Finer
# 4: 100
# 10: 100
# 20: 98
# 40: 94
# 60: 80
# 100: 75
# 200 60
0.01 mm: 62
0.002 mm: 63
  1. Soil is fine-grained
  2. Soil is medium-grained
  3. Soil is coarse-grained
  4. Not enough information provided
Explanation
Answer: A - Based on the provided sieve analysis results, the given soil sample is assumed to be fine-grained when classifying a soil using the Unified Soil Classification System. Since 50% or more of the sample passes through the #200 sieve, the soil is considered to be fine-grained. If less than 50% of the sample passed through the #200 sieve, the soil would have been considered to be coarse-grained.
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