Caracterização e determinação de parâmetros de resistência e deformabilidade do solo da UFFS Campus Cerro Largo/Rs

Abstract

The high growth in the civil construction, whether of small or large works, needs knowledge about the geotechnical properties of the soil, in order to avoid problems in the works carried out, and pathologies in the foundations. The researches involving the geotechnical characteristics are related to studies on the behavior, resistance and deformability of the soil, being possible to define the most suitable uses for soils of certain regions. So, the objective of the present work was to define the geotechnical characteristics, as well as the resistance to shear, consolidation and simple compression of the soils collected in three different points located in the territory of the UFFS, Campus Cerro Largo. The research methodology consisted of collect samples disturbed and undisturbed, performing characterization tests, direct shear tests saturated and unsaturated, edometric densification tests and test of simple compression. As results, were obtained the values corresponding to the natural moisture, physical indexes, Consistency Limits (Liquidity Limit, Plasticity Limit), resistence to saturated and unsaturated direct shear, pre - densification tension, compression and coefficient of recompression through the test of edometric densification, maximum stress through test of simple compression and soil classification. In relation to the soil characterization tests, Points 1 and 3 presented higher values of humidity, with 37.07% being Point 1 and 39.67% Point 2, the actual grain density was between 2.62 g.cm -3 and 2.67 g.cm -3 and the particle size showed larger fractions of fine particles, such as clay and silt followed by fine to medium sand. Regarding the limits of consistency, the values of the liquidity limits were around of 50% for all Points analyzed and of the plasticity limits values were between 7% and 15% for Points 1 and 2, and Point 3 was presented as No Plastic. The studied soils were classified as MH - Silte of High Compressibility, according to the classification SUCS and according to the classification HRB as Clay Soils of High Compressibility and Silt Soil of High Compressibility. The sample submitted to the direct shear test in the unsaturated condition showed higher resistance than the test sample in the saturated state, due to the fact that the flooded sample present higher humidity, thus reducing the resistance. The maximum value of the pre-densification tension was 75 kN.m -2 for Point 1 and the lowest value was 35 kN.m -2 for Point 3, and the average Point 1 rupture voltage was 21,13 kN.m -2 .