Abstract
Vegetation transpiration may significantly decrease the moisture content of active soils causing soil shrinkage and deformation. Severe damage to engineering structures may result. This phenomenon has been identified in reports from South Africa, Australia, and China as a cause of structural damage. This paper contains analyses of data collected in Mengzi County and other regions in China. The relationship between vegetative transpiration rates and deformation of high void ratio expansive soils is examined, and a formula for calculating estimated maximum contraction is presented. Also, current practices for dealing with active soils are discussed.
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