Layer Coefficient For Subbase Course Using Structural Number Calculator

Layer Coefficient Formula:

\[ a_n = \frac{SN_3}{T_a \times M_n} \]

Layer Coefficient (an):

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1. What is the Layer Coefficient Formula?

The Layer Coefficient formula calculates the strength coefficient of pavement materials based on structural number, actual thickness, and drainage characteristics. It represents the relative strength contribution of each layer in a pavement system.

2. How Does the Calculator Work?

The calculator uses the Layer Coefficient formula:

\[ a_n = \frac{SN_3}{T_a \times M_n} \]

Where:

\( a_n \) — Layer Coefficient (represents material strength)
\( SN_3 \) — Structural Number for Subbase Course (mm)
\( T_a \) — Actual Thickness Base Course Payment (mm)
\( M_n \) — Drainage Coefficient

Explanation: The formula calculates the relative strength contribution of a pavement layer by considering its structural capacity, actual thickness, and drainage performance characteristics.

3. Importance of Layer Coefficient Calculation

Details: Accurate layer coefficient calculation is crucial for pavement design, ensuring proper material selection, thickness determination, and overall structural integrity of the pavement system.

4. Using the Calculator

Tips: Enter structural number in mm, actual thickness in mm, and drainage coefficient. All values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What does the Layer Coefficient represent?
A: The Layer Coefficient represents the strength of the material and is the primary variable that factors in the type of material used for each pavement layer.

Q2: What is the Structural Number for Subbase Course?
A: It describes the ability of the subbase course to withstand axle loads and represents the structural capacity of the layer.

Q3: What is the Drainage Coefficient?
A: Drainage coefficient is a value assigned to a pavement layer that represents its relative loss of strength due to drainage characteristics and exposure to moisture saturation.

Q4: What are typical values for Layer Coefficient?
A: Values vary depending on material type, but typically range from 0.05 to 0.5 for different pavement materials.

Q5: How does drainage affect the Layer Coefficient?
A: Poor drainage reduces the effective strength of pavement materials, which is accounted for through the drainage coefficient in the calculation.