ON THE BOUNDARY CONDITIONS OF THE PROBLEM OF ASSIGNING THE REQUIRED STRENGTH OF FLEXIBLE PAVEMENTS AND ITS SOLUTION UNDER EXTREME TRAFFIC CONDITIONS

Abstract

Determination of the required strength of flexible pavements for more than six decades has been carried out using logarithmic functions based on the relationship between the required elastic modulus and the traffic intensity reduced to the calculated load: prospective or total for the service life. At the same time, since the mid-80s of the last century, MADI scientists have been conducting research, including the analysis of large-scale foreign experiments, which have shown that an alternative and in many cases more accurate way to determine the required elastic modulus depending on the total size of motion can be power functions. As the design experience has shown, the increase in turnaround times, as well as errors made during the processing of regulatory documents for the design and calculation of flexible pavements, led to the need to make changes to the currently used dependence to determine the required strength, namely to its more correct calculation by power functions. The need for these changes is especially relevant for roads with an extremely high total traffic size, when the logarithmic dependence goes beyond its boundary conditions, preventing the design of a structure corresponding to the integral movement.