Question

13.
In a flexible pavement
(A) vertical compressive stresses decrease with depth of the layer
(B) vertical compressive stress is maximum at the lowest layer
(C) tensile stresses get developed
(D) maximum stress induced by a given traffic load is dependent on the location of
load on the pavement surface​

Answer 1

ans is a vertical compressive

Answer 2

Given:

In a flexible pavement. which option is incorrect,

To Choose:

which option is incorrect in given options ?

(A) vertical compressive stresses decrease with depth of the layer .

(B) vertical compressive stress is maximum at the lowest layer .

(C) tensile stresses get developed .

(D) maximum stress induced by a given traffic load is dependent on the location of  load on the pavement surface​.

Solution:

firstly , lets know something about flexible pavement;

• Flexible pavements are so named because the total pavement structure deflects under loading.
• A flexible pavement structure is typically composed of several layers of materials. Each layer receives loads (stresses) from the above layer, spreads them out, and passes on to the next layer below.
• Thus the stresses will be reduced, which are maximum at the top layer and minimum at the lowest layer (top of subgrade).

Hence, from above we conclude that-

option (B) is incorrect.

Hence, vertical compressive stress is not maximum at the lowest layer.