Influence of Compaction Energy and Bentonite Clay Content in the Soil Hydraulic Conductivity

Abstract:

This paper intends to evaluate changes in permeability of a soil sample from Formação Barreiras, in Natal, the capital city of Rio Grande do Norte State, related to the degree of compaction and the adding of clay to the soil sample. In field works, samples were collected and permeability and density tests were performed. In laboratory, grain size distribution, Attemberg limits and particle density tests were conducted. Afterwards, compaction and permeability tests fulfilled the set of laboratory tests, with changes in compactive energy and sample clay content. The results from field and laboratory tests were compared and the relationship between compaction energy and sample clay content were portrayed. The soil was classified as silty sand. Field and laboratory test results were quite similar. As expected, the tests indicated that permeability is inversely proportional to both compaction energy and sample clay content in the soil tested.

• Periodical: Applied Mechanics and Materials (Volume 851)
• Pages: 858-863
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.851.858
• Online since: August 2016
• Authors: Osvaldo de Freitas Neto*, Olavo Francisco dos Santos Jr., Fagner Alexandre Nunes de França, Ricardo Nascimento Flores Severo
• Keywords: Barreiras Formation, Clay Content, Compacted Soils, Compaction Effort, Hydraulic Conductivity

References

[1] K. H. Head, Manual of Soil Laboratory Testing, Second ed., John Wiley & Sons, Inc., New York – Toronto, (1994).

[2] A. M. S. Oliveira and D. Corrêa Filho, Hydraulic conductivity tests on soils – Guidelines for their implementation in the field, ABGE, São Paulo, (1996).

[3] Brazilian Association of Technical Standards, NBR 7185: Soil – Determination of apparent density in situ, with employment of sand bottle (test method), Rio de Janeiro, (1986).

[4] Brazilian Association of Technical Standards, NBR 7181: Granulometric analysis, Rio de Janeiro, (1984).

[5] Brazilian Association of Technical Standards, NBR 6459: Determining the liquid limit, Rio de Janeiro, (1984).

[6] Brazilian Association of Technical Standards, NBR 7180: Soil – Determination of plastic limit, Rio de Janeiro, (1984).

[7] Brazilian Association of Technical Standards, NBR 6508: Soil grains passing through a sieve of 4. 8mm – Determination of Density, Rio de Janeiro, (1984).

[8] Brazilian Association of Technical Standards, NBR 7182: Soil – Compaction test, Rio de Janeiro, (1986).

[9] Brazilian Association of Technical Standards, NBR 13292: Soil – Determination of permeability coefficient of granular soils at constant load, Rio de Janeiro, (1995).

[10] Brazilian Association of Technical Standards, NBR 14545: Soil – Determination of soil permeability coefficient clay at variable load, Rio de Janeiro, (2000).

[11] E. L. Pastore and R. M. Fortes, Engineering Geology, ABGE, São Paulo, 1998 (in Portuguese).

[12] C. S. Pinto, Basic course of Soil Mechanics in 16 classes, Oficina de Textos, São Paulo, 2006 (in Portuguese).

[13] T. W. Lambe and R. V. Whitman, Soil Mechanics – SI Version, John Wiley & Sons, Inc. New York, (1979).