This report presents an overview of the results and findings of studies performed on the procedures and methods for defining the Engineering Properties of Mexico City Clay and, hence, to characterize them geotechnically. Research into this topic began formally in the 1950's and it is still on going. This paper summarizes the main aspects of these investigations. The author has recognized the impossibility of being exhaustive and has, instead, decided to describe mainly some of the results of research relevant to this topic in which he has participated directly and through some of his students, over the last 25 years or so. Index properties, compressibility and shear strength are all discussed from the view point of studies performed into these topics. The report also includes a brief discussion on the origins and effects of regional subsidence which affects the former lake area in the Basin of Mexico.
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