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Estudo do comportamento mecanico de um solo residual de arenito da Formacao Botucatu

Ferreira, P; (2002) Estudo do comportamento mecanico de um solo residual de arenito da Formacao Botucatu. Doctoral thesis, UNSPECIFIED.

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Abstract

The objective of this thesis is to study the mechanical behaviour of a residual soil of sandstone of Botucatu Formation, originated from a quarry near the RS 239 state road, in Novo Hamburgo/RS. Undisturbed block samples with 3 different natural void ratios were cut from this quarry. A new triaxial testing equipment was developed to study structured soils. It was provided with local strain measurement, automatic data acquisition and stress control by computer. Peak and large-strain shear strength envelopes, yield surfaces and Young's moduli over a wide strain range were determined with these tests. Optical microscopy, scanning electron microscopy as well as X-ray diffraction analyses were also performed in order to explain the observed mechanical behaviour. The mechanical behaviour of undisturbed samples was shown to depend on bonding type and degree, fabric, initial void ratio and applied values of effective confining pressure and axial strain. On the other hand, the behaviour of samples remoulded in the same initial void ratios was used as a reference to demonstrate the structured character of this residual soil. In some tests, it was noticed the effect of inherent anisotropy on shear strength and Young's moduli.

Type:Thesis (Doctoral)
Title:Estudo do comportamento mecanico de um solo residual de arenito da Formacao Botucatu
Keywords:Residual, structure, triaxial test
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Civil, Environmental and Geomatic Engineering

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