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Previous issue date: 2013-12-20 / As mudan?as naturais e antr?picas que v?m ocorrendo na zona costeira em todo o mundo representam um dos maiores problemas para a sociedade neste s?culo. Essa import?ncia se torna mais evidente devido ? elevada densidade das cidades litor?neas, ? crescente especula??o tur?stico-imobili?ria dessas ?reas e ?s altera??es clim?ticas que tendem a desencadear e acelerar esses processos. Nesse contexto, percebe-se cada vez mais um aumento significativo dos problemas relacionados ? eros?o costeira e recuo de fal?sias no estado do Rio Grande do Norte. A ?rea de estudo desta pesquisa localiza-se na zona costeira do munic?pio de Ba?a Formosa/RN, no litoral oriental-sul do Rio Grande do Norte, e possui uma extens?o de cerca de 1200 m ao longo da praia do Porto. O objetivo principal deste trabalho ? analisar a estabilidade dessas fal?sias, atrav?s de investiga??es de campo, ensaios e an?lises computacionais utilizando o M?todo dos Elementos Finitos e o M?todo de Bishop. Para atender aos objetivos deste trabalho, a ?rea foi subdividida em quatro trechos, e foram aplicados checklists e tamb?m realizados ensaios de caracteriza??o e de cisalhamento direto com materiais obtidos ao longo desses trechos. Os segmentos de fal?sia nessa zona costeira possuem alturas variando em torno de 4 m e 14 m e inclina??es de aproximadamente 40? a 90?. Os solos constituintes das fal?sias foram classificados, em termos gerais, como areias argilosas ou siltosas e argilas arenosas, sendo os solos mais argilosos e variegados pertencentes ? base da fal?sia. As an?lises de estabilidade mostraram que os fatores de seguran?a variaram, no trecho 01, de 2,38 a 6,06, no trecho 02, de 1,01 a 1,62, no trecho 03, de 1,29 a 1,78, e no trecho 04, de 0,83 a 2,48. Assim, os trechos 02 e 03, foram considerados como mais inst?veis. Entretanto, pode-se considerar o trecho 03 como o mais cr?tico devido ? aus?ncia de estruturas de prote??o costeira e ? estreita faixa de praia. Fato que n?o ocorre no trecho 02, o qual possui uma extensa faixa de praia e ? protegido por um muro de arrimo que restringe o acesso dos banhistas ?s ?reas adjacentes do p? da fal?sia. / The natural and anthropogenic changes that are occurring at the coastal zone around the world represent the greatest problem to society in this century. This problem becomes more evident due to high density of coastal cities, to growing tourist-estate speculation of those areas and to climate change that tend to trigger and accelerate the erosive processes that operating in the littoral. In this context, it?s possible perceive ever more a significant increase of problems associated to the coastal erosion and retreat of cliffs in the state of Rio Grande do Norte, where this study area of this search is located. The area is located in the coastal zone of the city of Ba?a Formosa/RN, in south-eastern coast of Rio Grande do Norte, and has a extension of about 1200 meters along the Porto beach. The main objective of this study is to analyze the stability of these cliffs in this region. Through field investigations, testings and computational analysis using the Finite Element Method and Equilibrium Limit Methods. The area was divided into four sections, and were applied checklists, and also realized characterization tests and direct shear tests with materials obtained along these sections. In this manner, it was found that the segments of cliff in this coastal zone have heights around 4 meters to 14 meters and inclinations of approximately 40? to 90?.However the constituents soils of the cliffs were classified, in general terms in accordance to Unified Soil Classification System (USCS), as clayey sands or silty sands, clays of low plasticity, clayey gravels and poorly graduaded sands. The most variegated and clayey soils belong to base of the cliff. The stability analysis showed that the safety factors ranged in section 01, from 1.92 to 4.93, in the section 02, from 1.00 to 1.43, in the section 03, from 1.36 to 1.75 , and section 04, from 1.00 to 3.64. Thus, the sections 02 and 03 were considered more unstable. However, the section 03 can be considered as the most critical section due to the absence of coastal protection structures and the narrow strip of beach.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/19368 |
| Date | 20 December 2013 |
| Creators | Souza J?nior, Carlos de |
| Contributors | 35816384449, http://lattes.cnpq.br/1573496204231636, Freitas Neto, Osvaldo de, 04738377493, http://lattes.cnpq.br/6335708403185496, Amaro, Venerando Eust?quio, 35385839191, http://lattes.cnpq.br/4215328958233942, Scudelari, Ada Cristina, 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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