Abstract
Mat foundation design requires an analysis of the mat when subjected to unsupported regions due to swelling or shrinkage of expansive soils. A study was conducted to investigate simple rational methods for calculating the active zone depth (z) and from it the edge moisture penetration distance (Lm) in expansive soils. Analysis of soil moisture diffusion assuming a periodic variation in surface‐soil suction indicated that z can be a function of the maximum suction change imposed, minimum suction change considered significant, climate frequency, and field diffusion coefficient. The Lm may be given by z-D where D is the depth of the foundation or perimeter stiffening beam below ground surface. Data required to evaluate z and Lm were obtained from field observations made during an 18‐month study on airport pavements on expansive soils. These climatic parameters may also be used in design of mat foundations supporting structures.
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