29.1.1 - Modulus of sub-grade reaction
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Practice Questions
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What is the modulus of sub-grade reaction?
💡 Hint: Think about how soil reacts to weight.
At what deflection value is the modulus of sub-grade reaction typically calculated?
💡 Hint: It's a small value that represents slight bending.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does the modulus of sub-grade reaction measure?
💡 Hint: Focus on what K represents in rigid pavement analysis.
True or False: A higher modulus of sub-grade reaction allows for a thinner pavement.
💡 Hint: Consider the relationship between support and thickness.
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Challenge Problems
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In a pavement project, a soil survey indicates a sub-grade with a modulus of 50 kg/cm³. If a standard load of 10,000 kg is applied at a deflection of 0.2 cm, calculate the pressure applied and discuss the implications on pavement design.
💡 Hint: Break down the formula.
Analyze a situation where increasing the modulus from 30 kg/cm³ to 60 kg/cm³ allows for a thinner slab. If the original design was 20 cm thick, how much could this thickness be reduced while maintaining structural integrity?
💡 Hint: Think about the balance of support and deflection limits.
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