Anais do XXXIV Congresso Brasileiro de Ciência do Solo

SOIL COMPRESSION CURVE PARAMETERS DETERMINED FROM DIFFERENT LINEAR REGRESSION METHODS

DIEGO TASSINARI⁽¹⁾; MOACIR DE SOUZA DIAS JUNIOR⁽¹⁾; PAULA SANT‘ANNA MOREIRA PAIS⁽¹⁾; DANIEL RUME CASAGRANDE⁽¹⁾; MARIA LUIZA DE CARVALHO ANDRADE⁽¹⁾; ANA CLÁUDIA PEREIRA CARDOSO⁽¹⁾;
1 - UFLA;

Soil precompression stress (σp) from 72 soil compression curves was calculated using four different methods. The σp was determined as the intersection of two lines: one is the line associated with stresses of 800 and 1600 kPa; the other is the regression line obtained from the first two, three, or four points, and as suggested by Dias Junior & Pierce (1995), which combines two methods depending on the sample water content (two points for samples with water content above 100 kPa and four points for samples with water content below 100 kPa). The σp and the slope of the secondary compression curve were statistically different depending on the method chosen. The method proposed by Dias Junior & Pierce (1995) and the regression method with the first four points yielded the greatest σp values. However, as water content is considered on the first method, σp values were lower when the soil is more vulnerable to compaction, i.e. when water content is high.

[baixar arquivo pdf]