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Test: McLeod and Burmister Method - Civil Engineering (CE) MCQ


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10 Questions MCQ Test Transportation Engineering - Test: McLeod and Burmister Method

Test: McLeod and Burmister Method for Civil Engineering (CE) 2024 is part of Transportation Engineering preparation. The Test: McLeod and Burmister Method questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: McLeod and Burmister Method MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: McLeod and Burmister Method below.
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Test: McLeod and Burmister Method - Question 1

McLeod method is based on the test results of ______ test.

Detailed Solution for Test: McLeod and Burmister Method - Question 1

McLeod is an empirical method used for the design of flexible pavements. The results from the plate load bearing test are used for the McLeod method. Bearing stress is not a test, it’s a strength parameter. The shear test is not used to compute the bearing capacity of the soil.

Test: McLeod and Burmister Method - Question 2

Burmister considered the pavement structure as a homogeneous half space.

Detailed Solution for Test: McLeod and Burmister Method - Question 2

Burmister Method:
(i) This method is based on young's modulus of elasticity of different layers of pavement. As flexible pavement composed of layers and elastic modulus of top most layer is maximum.
Assumptions:

  • Materials in each layer are isotropic, homogeneous, and elastic.
  • Pavement forms a stiffer layer having higher value of E than that of subgrade.
  • Layers are in constant contact.
  • The surface layer is infinite in horizontal direction but finite in vertical direction means infinite area with finite depth.

This method gives the following design deflection values for pavements with different layers –
For flexible pavement:

For rigid pavement:

Where, p = contact pressure at road surface due to wheel load (kg/m2)
Es = modulus of elasticity of subgrade (kg/cm2), a = radius of contact area(cm) and
F2 = deflection factor which depends upon Es/EP  and h/a,  for single layer system F2 = 1.

Test: McLeod and Burmister Method - Question 3

What is the equation for the thickness of pavement using McLeod method of design?

Detailed Solution for Test: McLeod and Burmister Method - Question 3

For computing the thickness of gravel base using McLeod method is given by  The equation uses the base course constant, the wheel load and the subgrade support.

Test: McLeod and Burmister Method - Question 4

What is the deflection at the surface of a flexible pavement due to a wheel load of 40 kN and a tyre pressure of 0.5 MPa? The value of E for pavement and subgrade is 20 MPa.

Detailed Solution for Test: McLeod and Burmister Method - Question 4

Burmister’s Method:
Assumptions

  • Materials in each layers are isotropic, homogeneous and elastic.
  • Pavement forms a stiffer layer having higher value of E than that of subgrade.
  • Layers are in constant contact.
  • Surface layer is infinite in horizontal direction but finite in vertical direction.

This method gives the following design deflection values for pavements with different layers

Where, p = contact pressure at road surface due to wheel load (kg/m2)
Es = modulus of elasticity of subgrade (kg/cm2), a = radius of contact area(cm) and
F2 = deflection factor which depends upon Es/EP  and h/a,  for single layer system F2 = 1.
Formula used:-
Design deflection for single-layered flexible pavement is given by,

Radius of contact area is given by,

Calculation:
Wheel Load, P = 40kN
Modulus of elasticity for subgrade and pavement, ES = EP = 20MPa
Tyre pressure, p = 0.50 MPa

Design deflection for flexible pavement

Test: McLeod and Burmister Method - Question 5

The surface layer is considered to be ______ in the vertical direction.

Detailed Solution for Test: McLeod and Burmister Method - Question 5

The surface layer is considered to be infinite in the horizontal direction and finite in the vertical direction. The surface layer is the topmost layer and hence it has a particular thickness and it extends infinitely along the horizontal direction. It is elastic and is homogeneous.

Test: McLeod and Burmister Method - Question 6

The design subgrade support can be obtained by ______ the ratio and the ______

Detailed Solution for Test: McLeod and Burmister Method - Question 6

In order to compute the design subgrade support, there are design charts available. The ratio of design subgrade support to the standard subgrade support is obtained from the chart and the ratio is found out. On multiplying the ratio by the contact pressure of the design load, the design subgrade support can be found out.

Test: McLeod and Burmister Method - Question 7

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

Detailed Solution for Test: McLeod and Burmister Method - Question 7

The equation for the thickness of pavement using McLeod method is 
From the question, P = 4100 kg; K = 85 and S = 1810 kg 

Test: McLeod and Burmister Method - Question 8

Find the thickness of the pavement using McLeod method for the soil subgrade having following details:
Wheel load, P = 4100 kg
Tyre pressure, p = 6.5 kg/cm2
Total subgrade support, S = 2050 kg
Base course constant, K = 80

Detailed Solution for Test: McLeod and Burmister Method - Question 8

The equation for the thickness of pavement using McLeod method is 
From the question, P = 4100 kg; K = 80 and S = 2050 kg 

Test: McLeod and Burmister Method - Question 9

What will be the subgrade support for a wheel load of 4100 kg and tyre pressure of 7 kg/cm2 if the subgrade soil is subjected to plate load bearing test using 30 cm diameter plate and it yielded a pressure of 2.5 kg/cm2 after ten repetitions of load at 0.5 cm deflection?

Detailed Solution for Test: McLeod and Burmister Method - Question 9

The radius of the contact area can be found out using the relation between wheel load (P), tyre pressure (p) and radius (a) as πa2 = P/p. So, the radius of the contact area can be obtained as 
In order to find subgrade support, perimeter area ratio and the plate load test details are required. The perimeter area ratio can be obtained as 
The design chart defined by Norman W. McLeod through the Canadian Department of Transport is used. A sample is shown below with the details for 0.5 cm deflection. The ratio for subgrade is obtained as 1.1 from the same.

Therefore, the design subgrade support is = Ratio obtained from chart X contact pressure of design load = 1.1 X 2.5 = 2.75 kg/cm2.

Test: McLeod and Burmister Method - Question 10

What is the deflection factor for a single layer in Burmister’s equation?

Detailed Solution for Test: McLeod and Burmister Method - Question 10

For a single layer, the pavement thickness or the thickness of the reinforcing layer, h is taken as 0. In the design chart, the value of the ratio of deflection factor is read for h/a = 0 and modulus of elasticity 1. It is obtained as 1.

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