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For uniformly graded soil the uniformity coefficient (Cu) is ...........
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1
For a uniformly graded soil, the particle size distribution curve is nearly vertical, indicating that all particles are of approximately the same size. Consequently, the diameter at 60% finer (D60тАЛ) is equal to the diameter at 10% finer (D10тАЛ), making the uniformity coefficient CuтАЛ equal to 1.
For a uniformly graded soil, the particle size distribution curve is nearly vertical, indicating that all particles are of approximately the same size. Consequently, the diameter at 60% finer (D60тАЛ) is equal to the diameter at 10% finer (D10тАЛ), making the uniformity coefficient CuтАЛ equal to 1.
CuтАЛ=D10тАЛD60тАЛтАЛ тАФ Definition of the Uniformity Coefficient
CcтАЛ=D10тАЛ├ЧD60тАЛ(D30тАЛ)2тАЛ тАФ Definition of the Coefficient of Curvature
The uniformity coefficient (CuтАЛ) is a dimensionless parameter used to assess the range of particle sizes in a soil sample. It is defined as the ratio D60тАЛ/D10тАЛ. In perfectly uniform soil, D60тАЛ=D10тАЛ, leading to CuтАЛ=1. As the range of particle sizes increases (well-graded soil), CuтАЛ increases significantly, often exceeding 4 or 6 for sands and gravels respectively.
Uniformly graded soil is also known as poorly graded or gap-graded depending on the distribution.
A soil is considered well-graded if CuтАЛ>4 for gravel and CuтАЛ>6 for sand.
Uniformly graded soil is characterized by a very steep grain size distribution curve.
Simple parameter to represent the uniformity of grain size distribution.
Helps in distinguishing between well-graded and poorly-graded soils.
Does not account for the shape of the particle size distribution curve between 10% and 60% finer.
Cannot be used alone to fully characterize the engineering properties of soil.
Soil classification according to the Unified Soil Classification System (USCS).
Assessing suitability of materials for base course construction and filtration.
The diameter DnтАЛ represents the size such that n% of the soil particles are finer than this diameter.
Options B, C, and D represent higher values of CuтАЛ, which correspond to well-graded soils, not uniformly graded ones.
A is correct тАФ For a uniformly graded soil, the uniformity coefficient is 1 because D60тАЛ and D10тАЛ are approximately equal.
Remember that CuтАЛ measures the range of sizes; higher values mean a wider range of particle sizes, whereas CuтАЛ=1 is the theoretical lower limit for a single-sized soil.
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