Comportamento geomecânico da Formação Guabirotuba: estudos de campo e laboratório. / Geomechanical behavoir of Guabirotuba geological formation: field and laboratory tests.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

The overconsolidated soils of the Guabirotuba Geological Formation are studied in order to achieve a better understanding of its geotechnical behavior. These soils are the main occurrence in the Curitiba Metropolitan Area. A revision of its geology is provided. The genesis and the sediments are described. The available data of the soils and published information about stiff and hard clays are analyzed in order to understand the unexpected behavior of foundations, excavations and slopes. It is given emphasis to the role of the fissures in the material behavior. A comprehensive experimental work is carried out at the Geotechnical Experimentation Site of the UFPR including field and laboratory studies. The geotechnical investigation comprises SPT, exploratory trenches, cone penetration, dilatometer and self boring pressuremeter tests. Scale effects in bored piles are assessed with high strain dynamic tests performed in elements with different cross sections. In the laboratory the composition and the microfabric are analyzed with X-ray diffraction and electron microscopy. Laboratory index soil tests are presented. Consolidation tests and characteristic curves of undisturbed and remolded samples provide information related with the stress history. The scale effects due to the fissures are assessed with direct shear and triaxial testing of specimens with different sizes. The conclusions indicate possible overconsolidation factors, chemical weathering effects and mechanisms affecting the in situ stress state and the shear strength.

ASSUNTO(S)

formação guabirotuba guabirotuba geological formation stiff and hard clay argilas rijas fraturadas geotechnical tests ensaios geotécnicos de campo ensaios geotécnicos de laboratório overconsolidated clay

ACESSO AO ARTIGO

Documentos Relacionados