DEPÓSITOS DE ARGILA ORGÂNICA MOLE – UM EXEMPLO EXTREMO NA BACIA DO RIO BARIGUI
Resumo
The Barigui River is a tributary of the Iguaçu River, located at Parana State, Brazil. This river is the main water
stream of the Metropolitan Area of Curitiba, Southern Brazil. In the flood plain of the Barigui River final stretch,
nearby its delta at the Iguaçu River, very soft organic clay deposits are found. The region suffered until some
years ago predatory mining activities of both clay and sand, for construction material purposes. Consequently,
a degradation process took place resulting in lack of vegetation, excavation open pits and random materials
dump areas. Simultaneously several engineering activities have been installed along the river banks such as the
Petrobras Oil Refinery (located at the right bank), the Santa Rita Rural Subdivision, the CIC Sewage Treatment
Plant of the State owned company Sanepar, the Bolívia-Brazil Gas Pipeline (Gasbol) and the Rio Bonito Housing
Development (all located along the left bank). The flood plain area considered herein is located on the river left
bank, encompassing approximately an area of 500 m wide by 1000 m long. This paper describes the geological
and geotechnical characteristics of the flood plain area, presenting results of several soil tests. A discussion about
some practical experiences, including engineering difficulties and solutions implemented during the construction
of the facilities above described, are shown. This paper concludes that even though the local organic clay deposits
are very soft and compressible, this natural material of the Barigui River flood plain area presents unique
engineering behavior, much more complex than well known problematic soils.
stream of the Metropolitan Area of Curitiba, Southern Brazil. In the flood plain of the Barigui River final stretch,
nearby its delta at the Iguaçu River, very soft organic clay deposits are found. The region suffered until some
years ago predatory mining activities of both clay and sand, for construction material purposes. Consequently,
a degradation process took place resulting in lack of vegetation, excavation open pits and random materials
dump areas. Simultaneously several engineering activities have been installed along the river banks such as the
Petrobras Oil Refinery (located at the right bank), the Santa Rita Rural Subdivision, the CIC Sewage Treatment
Plant of the State owned company Sanepar, the Bolívia-Brazil Gas Pipeline (Gasbol) and the Rio Bonito Housing
Development (all located along the left bank). The flood plain area considered herein is located on the river left
bank, encompassing approximately an area of 500 m wide by 1000 m long. This paper describes the geological
and geotechnical characteristics of the flood plain area, presenting results of several soil tests. A discussion about
some practical experiences, including engineering difficulties and solutions implemented during the construction
of the facilities above described, are shown. This paper concludes that even though the local organic clay deposits
are very soft and compressible, this natural material of the Barigui River flood plain area presents unique
engineering behavior, much more complex than well known problematic soils.
Palavras-chave
solo muito mole; argila orgânica; compressibilidade do solo; geotecnia; very soft soil; organic clays; soil compressibility; geotechnical work
Texto completo:
PDFDOI: http://dx.doi.org/10.5380/geo.v62i0.7019
