Numerical Investigation of Suction Profiles Under Cracked Soil Conditions

This chapter delves into the significant impact of shrinkage cracks on the behavior of expansive soils, particularly in regions like South Australia where such soils are prevalent. Through advanced numerical modeling using the finite element method, the study examines how cracks of varying widths and depths influence moisture movement and suction profiles. The research reveals that the presence of cracks can significantly increase the depth of suction change (Hs), which is a crucial parameter for designing resilient infrastructure. The study also highlights the importance of considering crack geometry in the design stage to ensure the serviceability of lightweight structures. Additionally, the chapter discusses the potential for cracks to create preferential flow paths, affecting water infiltration and evapotranspiration processes. The findings are supported by data from an instrumented site in Australia, providing practical insights into the behavior of expansive soils under real-world conditions. This research underscores the need for further investigation into the volume and degree of cracking, as well as the influence of climate extremes on cracked soil conditions.