Abstract
This study aims to determine the reasons for settlement on King Faisal Road in Jazan City, Kingdom of Saudi Arabia, using Geographical Information System (GIS) techniques. Pavement engineers and contractors in Saudi Arabia are often faced with the challenges of constructing pavement for desert sand dune areas, mountainous areas, and the sabkha or salt flat areas, and they are faced with problems of settlement. King Faisal Road in Jazan City is selected as a case study. This road suffers distress problems such as settlement and bleeding. The primary objective of this paper is to investigate the reasons for the settlement on King Faisal Road in Jazan City by using two criteria of investigations. These criteria of investigation include soil and asphalt laboratory test results, and analysis of the site’s drainage system by Geographic Information System (GIS). The obtained results show that the reasons for settlement along King Faisal Road were focused on the drainage systems on the road and the traffic loading characterized by different classes of vehicles. The purpose of this investigation was to determine the cause of settlement inconsistencies in pavement surface elevations at the distressed locations. There are different distressed locations on King Faisal Road, but the main distressed site is located in the area of intersection between King Faisal Road and Prince Sultan Road, encompassing the intersection’s traffic signal domain. Proposed solutions to the problem of settlement are presented in this paper. One of these solutions: Drilling under the road layers (sub-base, base, and asphalt) to a depth of at least five meters and drying the area using the appropriate means of water drainage such as vertical drilling wells. The second proposed solution: Using a chemically-enhanced solution to a depth of at least ten meters under the road layers, with a soil injection of high-softness cement, to increase the durability of the soil in the settlement areas.
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