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Previous issue date: 2015-02-27 / O litoral do Estado do Rio Grande do Norte ? caracterizada pela presen?a de dunas
e fal?sias. Estas ?ltimas consistem em taludes com altura de at? 40 metros e
inclina??o variando de 30o
a 90o
com a horizontal. Assim, esta disserta??o teve
como objetivo a avalia??o da estabilidade da fal?sia da Ponta do Pirambu em Tibau
do Sul/RN, e a realiza??o de um estudo param?trico sobre a estabilidade de uma
fal?sia homog?nea considerando como vari?veis a coes?o do material, a altura da
fal?sia e a inclina??o do talude. O estudo na Ponta do Pirambu considerou ainda a
possibilidade da exist?ncia de uma cobertura coluvionar com espessura variando de
0,50 a 5,00 metros. As an?lises foram realizadas pelo m?todo de Bishop, utilizando
o programa GEO5. Na an?lise param?trica foram produzidos gr?ficos que
relacionam altura da fal?sia com a inclina??o, para fatores de seguran?a iguais a
1,00 e 1,50; al?m de gr?ficos onde ? poss?vel obter facilmente o menor fator de
seguran?a a partir da coes?o, altura da fal?sia e sua inclina??o. Concluiu-se que
esses gr?ficos s?o muito ?teis para an?lises preliminares, para a defini??o de ?reas
cr?ticas em mapeamentos de riscos em ?reas de fal?sias e para determina??o de
uma equa??o para obten??o do menor fator de seguran?a em fun??o dos
par?metros de resist?ncia e da geometria de um talude. Em rela??o ? fal?sia da
Ponta do Pirambu, os resultados mostraram que a fal?sia est? sujeita a
deslizamentos superficiais localizados nos pontos onde pode haver a presen?a do
col?vio com espessuras superiores a dois metros. Entretanto, a fal?sia se mant?m
est?vel, apresentando fator de seguran?a global igual ou superior a 2,50 na
condi??o saturada. / The coastline from Rio Grande do Norte state is characterized for the presence of
dunes and cliffs. The latter consist of slopes with height up to 40 meters and
inclinations ranging from 30? to 90? wich horizontal. Thus, this dissertation had as
objective the evaluation of the stability of cliff from Ponta do Pirambu in Tibau do
Sul/RN, and the realization of a parametric study on the stability of a homogeneous
cliff considering as variables the material's cohesion, the cliff height and the slope
inclination. The study in Ponta do Pirambu considered yet the possibility of the
existence of a colluvial cover with thickness ranging from 0.50 to 5.00 meters. The
analyzes were performed by Bishop method, using GEO5 software. In parametric
analysis were produced graphics that relate height cliff with the inclination, to safety
factors equals to 1.00 and 1.50; besides graphics where it is possible easily get the
lowest safety factor as from the cohesion, cliff height and its inclination. It was
concluded that these graphs are very useful to preliminary analyzes, for the definition
of critical areas in risk mappings in areas of cliffs and for determination of an
equation for obtaining the lowest safety factor function of the strength parameters
and of slope geometry. Regarding the cliff from Ponta do Pirambu, the results
showed that the cliff is subject to superficial landslides located in the points where
may there be the presence of colluvium with thicknesses greater than two meters.
However, the cliff remains stable presenting the global safety factor equal or superior
to 2.50 in the saturated condition.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/20061 |
| Date | 27 February 2015 |
| Creators | Ribeiro, Jo?o Ronyberto Cavalcante |
| Contributors | 35816384449, http://lattes.cnpq.br/1573496204231636, Scudelari, Ada Cristina, 52265854972, http://lattes.cnpq.br/6556306307432176, Coutinho, Roberto, 07531893487, Severo, Ricardo Nascimento Flores, Santos J?nior, Olavo Francisco dos |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA CIVIL, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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