Numerical Analysis to Assess the Vertical Drainage Within Flexible Pavement.

Aqeel Al-Adili,Rasha H Abdul-Amir,Osamah Hassan Chfat

doi:10.14419/ijet.v7i4.20.25856

Abstract

In this research the work methodology include the software program SEEP/W routine of the GEOSLOPE 2012; which was used to simulate and analyze the vertical drainage of the pavement cross section using steady-state and transient analysis. A laboratory model consisting of typical structure layers of flexible pavement was considered in this research with a 2% slope with the influence of three different rain intensities (30mm/min, 60mm/min and 90mm/min); in which each one has a duration differs from the other. The results indicated that the value of the pore-water pressure in the surface layer resulting from 90 mm/min rainfall intensity is 83.65% greater than the pressure generated by the 60mm/min intensity of rain and 91.076% greater than the pressure produced from 30mm/min intensity. The average of accumulation water produced by the 30mm/min rainfall intensity in the pavement structure is 44.73 % greater than the average of accumulation of water from the 60mm/min intensity and 77.85% higher than the 90mm/min intensity of rain. The water flux through the pavement cross section during the rainy period of 30 mm/min was 8.42% higher than the water flux of 60 mm/min and 49.82% of the water flux of 90 mm/min intensity of rain.

Highlights

Providing adequate drainage to a pavement system has been considered as an important design consideration to prevent premature failures due to water related problems such as pumping action, loss of support, and rutting, among others
In a point on the surface of the pavement, which has a depth of 0 meters, the greatest value of pore water pressure is equal to 283.32 kPa
The transient analysis resulted from numerical analysis model showed that the value of the pore-water pressure in the surface layer resulting from 90mm/min rainfall intensity and presence of wheel load is 32.21% greater than the pressure generated by the 60mm/min intensity of rain and 85.9% greater than the pressure produced due to 30mm/min intensity

Summary

Introduction

Providing adequate drainage to a pavement system has been considered as an important design consideration to prevent premature failures due to water related problems such as pumping action, loss of support, and rutting, among others. Most water in pavements is due to rainfall infiltration into unsaturated pavement layers, through joints, cracks, shoulder edges, and various other defects, especially in older deteriorated pavements. Water seep upward from a high groundwater table due to capillary suction or vapor movements, or it may flow laterally from the pavement edges and side ditches (Rokade et al, 2012). Drainage quality is an important parameter which affects the highway pavement performance. The aim of this research is to simulate and analyze the vertical drainage on flexible pavement cross section using steady-state and transient analysis by considering three different rain intensities (30, 60 and 90mm/min) and three different duration

Objectives

Methods

Results

Conclusion