Managing Pavement Settlement Risk: Impact of Waterlogging and Soil Conditions

Birendra Kumar Singh

Abstract

In the context of road infrastructure, the occurrence of waterlogging due to rainfall can have significant repercussions. Rainwater often infiltrates the road surface and, depending on factors such as the depth of the foundation and the extent of penetration into the ground, can lead to the soil beneath the road becoming either moist or saturated. This, in turn, can result in a reduction of the soil's bearing capacity. When vehicles traverse such road sections, the loads they exert on the pavement must be adequately supported by the underlying soil. If the applied load from vehicles surpasses the bearing capacity of the weakened soil, settlement becomes a likely outcome. It is crucial to establish permissible settlement limits to ensure the safe and effective functioning of road networks. For sandy soil conditions, the permissible settlement limit is typically set at 40 mm, while for clayey soil, a somewhat greater tolerance of 65 mm is generally considered acceptable. These settlement thresholds serve as essential guidelines for road engineers and planners when designing, maintaining, or assessing road infrastructure in areas susceptible to waterlogging. Efforts to mitigate settlement risks in such areas may include improved drainage systems, reinforcing the pavement structure, or adjusting the roadbed's foundation depth. A comprehensive understanding of the complex interplay between rainfall, soil conditions, and pavement settlement is essential for the sustainable and resilient development of road networks.

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