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Master's Dissertation
DOI
10.11606/D.18.2000.tde-10062008-082455
Document
Author
Full name
José Antonio Cancino Calle
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2000
Supervisor
Committee
Vilar, Orencio Monje (President)
Rohm, Sérgio Antonio
Stancati, Gene
Title in Portuguese
Análise de ruptura de talude em solo não saturado
Keywords in Portuguese
Estabilidade de taludes
Resistência
Retro-análise
Solo não saturado
Sucção matricial
Abstract in Portuguese
Apresenta-se neste trabalho uma análise de ruptura de um talude em solo não saturado. O talude, com cerca de 15 m de altura, é composto de areia fina a média argilosa, com grau de saturação da ordem de 55% e SPT variando entre 4 golpes no topo a 13 golpes na base. Determinaram-se as seguintes propriedades do solo: resistência, condutividade hidráulica saturada e não saturada e curva de retenção, além de medir-se a sucção matricial em campo ao longo do ano. Efetuaram-se análises paramétricas para avaliar o efeito da precipitação na mudança do perfil de sucção matricial do terreno e suas implicações na resistência e, por extensão, na estabilidade do talude. Construíram-se, também, ábacos que incluem o efeito da variação da sucção matricial, utilizáveis para taludes com características semelhantes ao talude estudado. Verificou-se que para as condições do talude natural, no auge da estação seca, as sucções matriciais são de tal magnitude que fornecem estabilidade ao talude. À medida que ocorrem precipitações, as sucções matriciais reduzem-se e o fator de segurança do talude diminui, o que justifica a ruptura ocorrida.
Title in English
Slope back analysis in unsatured soils
Keywords in English
Back analysis
Shear strength
Slope stability
Suction
Unsatured soils
Abstract in English
In this article is showing an slope back analysis in unsaturated soil. The slope, with about 15 m of height, it is composed of a fine to medium clayey sand, with degree of saturation of the order of 55% and SPT varying among 4 blows in the top to 13 blows in the base. The following properties of the soil were determined: resistance, saturated and unsaturated conductivity and it curves of retention, besides measuring the suction along the year. Parametric analyses were made to evaluate the effect of the precipitation in the changes of the ground matricial suction profile and its implications in the resistance and, by extension, in the slope stability. They were also made, some abaci that include the effect of the matricial suction variation, usable for slopes with similar characteristics to the studied slope. It was verified that for the conditions of the natural slope, next to the peak of the dry station, the matricial suction is of such magnitude that it supply stability to the slope. In the successive events of precipitations the matricials suctions is reduced and the slope security factor decreases, that justifies the happened rupture.
 
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200ME_JoseAntonio.pdf (6.69 Mbytes)
Publishing Date
2008-06-11
 
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