Question

D\(_{10}\) in soil mechanics represents that:

• A. 10% of the particles are finer than this size
• B. 30% of the particles are finer than this size
• C. 50% of the particles are finer than this size
• D. 60% of the particles are finer than this size

Hint:

D\(_{10}\) is used to calculate the coefficient of uniformity (C\(_u\)).
C\(_u\) = D\(_{60}\) D\(_{10}\).
Also, remember D\(_{30}\) for coefficient of curvature.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
D\(_{10}\) is a term used in grain size analysis.
It is a particle size parameter.

Step 2: Key Formula or Approach:
D\(_{10}\) is also called effective size.
It is the diameter corresponding to 10% finer in the grain size distribution curve.

Step 3: Detailed Explanation:
D\(_{10}\) is used to classify soils.
It represents the particle size below which 10% of the soil particles are finer.
D\(_{30}\) represents 30% finer.
D\(_{50}\) represents 50% finer.
D\(_{60}\) represents 60% finer.
Thus, D\(_{10}\) means 10% of the particles are finer than this size.

Step 4: Final Answer:
D\(_{10}\) means 10% of the particles are finer than this size.
Hence, the correct option is (A).