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Find the thickness of the pavement using McLeod method for the soil subgrade having following details:
Wheel load, P = 4100 kg
Tyre pressure, p = 5 kg/cm2
Total subgrade support, S = 1810 kg
Base course constant, K = 85
Wheel load, P = 4100 kg
Tyre pressure, p = 5 kg/cm2
Total subgrade support, S = 1810 kg
Base course constant, K = 85
- a)31 cm
- b)30 cm
- c)28 cm
- d)29 cm
Correct answer is option 'B'. Can you explain this answer?
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Find the thickness of the pavement using McLeod method for the soil su...
To find the thickness of the pavement using the McLeod method, we need to follow the given steps:
1. Determine the maximum allowable deflection (δ) for the pavement. This is typically specified by the design standards or guidelines. Let's assume the maximum allowable deflection is δ = 0.25 cm.
2. Calculate the equivalent radius (r) of the contact area between the tire and pavement using the equation:
r = (P/p)1/2
where P is the wheel load (4100 kg) and p is the tire pressure (5 kg/cm2).
Plugging in the values, we get:
r = (4100/5)1/2 = 90.7 cm
3. Calculate the subgrade modulus (k) using the equation:
k = (S/rδ)
where S is the total subgrade support (1810 kg) and δ is the maximum allowable deflection (0.25 cm).
Plugging in the values, we get:
k = (1810/90.7*0.25) = 79.5 kg/cm3
4. Determine the base course constant (K) from the design standards or guidelines. In this case, K = 85.
5. Calculate the thickness of the pavement (h) using the equation:
h = (k/K)1/4
Plugging in the values for k and K, we get:
h = (79.5/85)1/4 = 0.879 cm
6. Finally, convert the thickness to centimeters:
h = 0.879 cm = 30 cm (rounded to the nearest whole number)
Therefore, the thickness of the pavement using the McLeod method for the given soil subgrade is 30 cm, which corresponds to option B.
1. Determine the maximum allowable deflection (δ) for the pavement. This is typically specified by the design standards or guidelines. Let's assume the maximum allowable deflection is δ = 0.25 cm.
2. Calculate the equivalent radius (r) of the contact area between the tire and pavement using the equation:
r = (P/p)1/2
where P is the wheel load (4100 kg) and p is the tire pressure (5 kg/cm2).
Plugging in the values, we get:
r = (4100/5)1/2 = 90.7 cm
3. Calculate the subgrade modulus (k) using the equation:
k = (S/rδ)
where S is the total subgrade support (1810 kg) and δ is the maximum allowable deflection (0.25 cm).
Plugging in the values, we get:
k = (1810/90.7*0.25) = 79.5 kg/cm3
4. Determine the base course constant (K) from the design standards or guidelines. In this case, K = 85.
5. Calculate the thickness of the pavement (h) using the equation:
h = (k/K)1/4
Plugging in the values for k and K, we get:
h = (79.5/85)1/4 = 0.879 cm
6. Finally, convert the thickness to centimeters:
h = 0.879 cm = 30 cm (rounded to the nearest whole number)
Therefore, the thickness of the pavement using the McLeod method for the given soil subgrade is 30 cm, which corresponds to option B.
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Find the thickness of the pavement using McLeod method for the soil su...
The equation for the thickness of pavement using McLeod method is 
From the question, P = 4100 kg; K = 85 and S = 1810 kg
From the question, P = 4100 kg; K = 85 and S = 1810 kg
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Find the thickness of the pavement using McLeod method for the soil subgrade having following details:Wheel load, P = 4100 kgTyre pressure, p = 5 kg/cm2Total subgrade support, S = 1810 kgBase course constant, K = 85a)31 cmb)30 cmc)28 cmd)29 cmCorrect answer is option 'B'. Can you explain this answer?
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