EVALUATION OF FLEXIBLE PAVEMENT PERFORMANCES FOR OVERLOADING SCENARIO

摘要

The present investigation studies the practicality and evaluation of the Indian flexible pavement performance under an overloading scenario. Variation in the traffic load influences the behaviors of the pavement structure, especially in an overloading scenario. In the present study, the impact of overloading conditions on the Indian flexible pavement design specifications is discussed and analyzed. A 2 km stretch of National Highway was selected on NH 31 (old NH 19) near Chapra, Bihar and Axle load survey, where the vehicles weighing over the maximum permissible limit are considered. IITPAVE is used to develop a flexible pavement model using field data and calibrated to design specifications. Transfer functions, rutting, and fatigue are estimated assuming the overloading axle load, traffic volume, and tire pressure ranging from 0.56 MPa to 1.0 MPa. For the design traffic volume, allowable tensile strain is determined and compared with IITPAVE results. It is observed that even 25% of overloading imparts adverse effects on the pavement's fatigue life and makes Wet Mix Macadam (WMM) and Granular Sub-Base (GSB) layer most sensitive against the early deterioration. However, higher tire pressure than design consideration displays the tendency of fatigue failure even'at lower value of overloading percentage. In a thin bituminous layer with the Dense Bituminous Macadam (DBM) layer, rutting failure is more critical. The cementitious base and sub-base layer with SAMI interlayer have the best structural performance under overloading conditions. The study will help engineers to decide the crust thickness for the industrial activity zones where vehicles' percentage of overloading is relatively high to make flexible pavement more sustainable.