Highway Research Record

I.HIGHWAY PLANNING, MANAGEMENT, PERFORMANCE EVALUATION AND INSTRUMENTATION
2. PAVEMENT EVALUATION
NEW PROJECTS
Equivalent Half Space Model for Evaluation and Design of Airfield Pavement

Duration: June2004
Soil Engineering and Material Testing (SEMT) Wing, College of Military Engineering, Pune (R)

Scope and Objectives
Development and evaluation of design methodology for airfield pavements based on the concept of equivalent half space derived from stochastic modelling.

Methodology

The reinforcing action of stiffer layers laid over elastic half space has been considered for developing a model of equivalent half space with enhanced stiffness. The methodology involves: -
(i) Assimilation and analysis of load - deflection data obtained by Falling Weight Deflectometer.
(ii) Development of stochastic model for generation of deflection data and equivalent half space elastic constants.
(iii) Comparison of results with multi-layered elastic theory.
(iv) Development of methodology for PCN evaluation and design of airfield pavements.

Conclusions
The results obtained using equivalent half space model and those obtained by using multi-layered elastic theory are comparable with respect to PCN results and design of overlay for airfield pavements. The supporting load-deflection data obtained by using Falling Weight Deflectometer (FWD) and the results of analysis using multi-layered elastic theory are available with SEMT Wing

Significance/ Utilisation potential
The method is simplistic solution for determining behaviour of airfield pavements under load as compared to multi-layered elastic theory. The methodology can be utilized more effectively for evaluation and design of airfield pavements and has potential for extending the methodology for highway pavements as well.

Limitations
The equivalent half space model provides consistent and comparable results with multilayered elastic theory. However it requires validation by national/international institutions/organizations.