World hydraulic engineering practice shows that the use of practically any earth material is possible for constructing fill structures, provided appropriate laboratory and field investigations are conducted. One such soll is chalk. Despite the fact that the existing Construction Norms and Regulations (SNIP) II-53-73 do not prohibit the use of carbonate rocks (and, consequently, chalk) for fill structures, distrust of the possibility of using chalk as the foundation of structures and the more so as a construction material persists. A good example of using chalk, mainly as a constructlonmaterlal, is the construction of three large dams in the USA (Gavins Point, Fort Randall, and Harlan County).The Euphrates hydrostatlon in Syria was constructed on a chalk foundation and with chalk rocks in the left-bank abutment and is operating successfully.
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