I want to know how the practicing Engineers are calculating in the field to design a Concrete pavement on this cross section of pavement.
Check out the following links:
https://www.fhwa.dot.gov/engineering/geotech/pubs/05037/05c.cfm
https://sjce.ac.in/wp-content/uploads/2018/01/CV530_04_Pavement-Design.pdf
Check out the following links:
https://www.fhwa.dot.gov/engineering/geotech/pubs/05037/05c.cfm
https://sjce.ac.in/wp-content/uploads/2018/01/CV530_04_Pavement-Design.pdf
The modulus of subgrade reaction can be evaluated based on plate loading test results.
In South Africa, as a first conceptual/prelim design, I use the M10 Manual's nomographs** to determine the structural capacity of the sub strata. The values are conservative and robust, but needs refinement during detail design phase. During detail design, I revert back to mechanistic-empirical design methods and make use of transfer functions for each specific material type in order to quantify the design life of the pavement structure as a whole. Programs like cncPave are fantastic, but can be manipulated to give favourable results, not necessarily realistic values.
Below is a link to the South African Pavement Engineering Manual - Chapter 10. It's a fantastic document. The relevant section you are looking for is 8.1. This document refers to excellent sources expanding on the concepts.
** http://www.nra.co.za/live/click.php?u=%2Fcontent%2FSAPEM-Chapter-10-2nd-edition-2014.pdf&o=Item%2B232
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