Banca de DEFESA: FELLIPE JOSÉ REIS BRANDÃO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : FELLIPE JOSÉ REIS BRANDÃO
DATE: 31/03/2022
TIME: 16:30
LOCAL: Pós-Graduação Engenharia Civil - on line
TITLE:

Evaluation of Compacted Sandy Soil Used in the Cover Layer of the Municipal Landfill of Altinho – PE

KEY WORDS:

Final cover layer. Anomalous soil. Compacted soil. Water permeability.

PAGES: 90
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

Among the various technologies for the treatment of Municipal Solid Waste (MSW), the landfill is one of the techniques widely applied in developing countries because the operation is simple, and the cost is relatively low compared to other forms of treatment. In a sanitary landfill, a final compacted soil cover layer is applied to isolate the waste from the outside environment, to minimize the entry of water into the waste massif, to reduce gas emissions into the atmosphere, and to avoid the proliferation of rodents and disease vectors. The Brazilian standards that deal with landfills in terms of design, implementation, operation, and closure, do not discriminate the type of soil to be used as a cover layer material, do not stipulate minimum thickness, do not present a methodology for its execution, and do not mention values for the soil water permeability coefficient of the cover system. In this sense, this scientific composition aims to investigate the performance of compacted soil used as a raw material constituent of the cover layer of the Municipal Landfill of Altinho - PE. To this end, the physical characterization of the soil used in the layer was performed, verification of its parameters regarding the feasibility for use in landfills, mineralogical analysis, evaluation of water permeability of the compacted soil at different moistures, the study of shear strength and numerical simulation of a cell of the landfill, obtaining the curve of the characteristic curve of the soil and analysis of the experimental points of the curve to the adjustments proposed in the literature. The relation between the optimum compaction moisture and the generalized air entry point (GAE) was verified. The results showed that, although the soil presents 69% sand, it has admissible water permeability for use in landfills according to international standards. This permeability seems to be directly related to the mineralogical composition of the soil, which is conducive to the occurrence of cementation reactions. The fit of the van Genuchten curve to the experimental points of the retention curve met the conditions of agreement from the statistical parameters analyzed. The optimum soil compaction moisture has a value close to the GAE, in which soil desaturation begins and the air starts to enter the largest pores formed moisture loss. The soil compaction should be done in the normal proctor energy obeying the addition of enough water to reach the optimum moisture. In conclusion, that type of final cover layer (compacted sandy-clay soil) used is inadequate for the landfill region due to the climatological characteristics to which the soil is subjected. The soil compaction of the cover layer can be performed at normal proctor energy at optimum moisture since in this scenario the cover layer presents concomitantly the highest shear strength and water permeability at adequate levels.

BANKING MEMBERS:
Externa à Instituição - CECÍLIA MARIA MOTA SILVA LINS - UFRPE
Externo à Instituição - EDUARDO ANTONIO MAIA LINS - IFPE
Presidente - 2130650 - JOSE FERNANDO THOME JUCA
Externa à Instituição - NAYARA TORRES BELFORT ACIOLI MAGALHAES