Estudo das correlações entre os parâmetros de resistência ao cisalhamento dos solos e o índice de resistência à penetração (NSPT)

Abstract

This article proposes a study of the correlation between the penetration resistance index (NSPT) provided in the SPT surveys, and soil friction angle, using the results of nine probes to percussion and three triaxial compression tests of the type CIU, located on the hillside in the city of Manhuaçu-MG, by the methods of Peck et. (1953), Meyerhof (1956), De Mello (1971), Peck, Hanson and Thornburn (1974), Parry (1977), Mitchell, Guzikowski and Villet (1978), Godoy (1983), Décourt (1989), Hatanaka and Uchida (1996), Teixeira (1996). The results showed that, for block 1 tested, the methods that came closest were from Teixeira (1996) and Peck, Hanson and Thornburn (1974). For block 2, the value of friction angle was shown to be too low, which may be explained by an inadequate sampling that led to its lowering and loss of in situ strength characteristics. For block 3, it was observed that all the results were acceptable, in which the method of Stroud (1989) showed a greater discrepancy, with a variation of 16.84%. It is concluded that such correlations are obtained in an empirical way and, for the specific conditions, it is necessary to analyze if the study situation fits with those established by each method