21.2.5. Plate Bearing Test

Try these first

1. 1.

   What is the purpose of the Plate Bearing Test?

   Hint

   Think about why we need to know how much weight the soil can bear.

2. 2.

   What does the modulus of subgrade reaction signify in pavement design?

   Hint

   Relate this to how much a pavement can hold.

3. 3.

   What does the Plate Bearing Test evaluate?

   • A) Soil composition
   • B) Support capacity of subgrades
   • C) Water drainage

   Hint

   Consider the name of the test.

4. 4.

   True or False: The modulus of subgrade reaction is calculated from the settlement data.

   • True
   • False

   Hint

   Reflect on how we analyze the results from the tests.

5. 5.

   You conduct a Plate Bearing Test on a site and get settlements of 1.2 mm, 1.5 mm, and 1.3 mm under successive loads of 160 kg, 180 kg, and 170 kg, respectively. Calculate the average modulus of subgrade reaction.

   Hint

   Don’t forget to sum the settlements and divide by the number of readings!

6. 6.

   A construction project finds that the anticipated modulus calculated isn't sufficient for expected traffic loads. Suggest alternative methods to improve subgrade support.

   Hint

   Think about both materials and structural changes that can enhance support.