Proposed integration of enhanced lateral drainage geotextiles in moisture-sensitive subgrade stabilisation

AUTHORS: G. Matthews and B. Kok

Wicking geotextiles have emerged as a pivotal innovation in pavement design, addressing moisture management challenges that impact the performance and durability of road structures. Traditional drainage systems often fall short in managing capillary water under partially saturated conditions, leading to subgrade instability and pavement deterioration.

This paper explores the key functions and benefits of wicking geotextiles, including improved moisture control, enhanced lateral drainage, and subgrade stabilisation. Extending from Austroads (2017) and AASHTO (1993) design frameworks, we outline applications and design considerations tailored to diverse climatic conditions. A review of the Montana Department of Transportation studies (2009-2014) highlights the material’s potential and underscores the need for further research. Key gaps, such as localised climate data, laboratory testing, and long-term durability, are identified, along with future research recommendations. By integrating wicking geotextiles into pavement designs, the construction industry can achieve cost-effective, sustainable, and resilient road infrastructure.