Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-06-02T22:25:25Z No. of bitstreams: 1 NathaliaMarinhoBarbosa_DISSERT.pdf: 5916722 bytes, checksum: 23ebb525979e506e69d2ca101608e58b (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-06-08T22:06:34Z (GMT) No. of bitstreams: 1 NathaliaMarinhoBarbosa_DISSERT.pdf: 5916722 bytes, checksum: 23ebb525979e506e69d2ca101608e58b (MD5) / Made available in DSpace on 2017-06-08T22:06:34Z (GMT). No. of bitstreams: 1 NathaliaMarinhoBarbosa_DISSERT.pdf: 5916722 bytes, checksum: 23ebb525979e506e69d2ca101608e58b (MD5) Previous issue date: 2017-03-31 / Esta Disserta??o trata da obten??o das propriedades geot?cnicas de sedimentos da Forma??o Barreiras e da an?lise da estabilidade das fal?sias localizadas no Centro de Lan?amentos da Barreira do Inferno, munic?pio de Parnamirim, no estado Rio Grande do Norte. ?reas costeiras despertam um grande interesse pela popula??o em geral e empreendimentos nessas regi?es s?o bastante comuns, fazendo com que os processos erosivos precisem ser estudados a fim de proporcionar um maior entendimento dos fatores que influenciam na estabilidade das fal?sias e consequentemente na sua seguran?a. O local de estudo em quest?o, por ser uma ?rea militar protegida, encontra-se completamente livre de interfer?ncias humanas e sem nenhuma edifica??o em seu topo, fazendo com que as an?lises sejam representativas de condi??es naturais impostas aos taludes estudados. As atividades desenvolvidas durante a elabora??o desta disserta??o est?o agrupadas em quatro etapas: revis?o bibliogr?fica, trabalhos de campo, ensaios de laborat?rio e an?lise da estabilidade das fal?sias. Atrav?s de visitas realizadas na ?rea de estudo, foram colhidas informa??es necess?rias para a posterior obten??o dos perfis cr?ticos das fal?sias para an?lise de estabilidade. Foram observados que os perfis em geral n?o s?o ?ngremes, com a presen?a de incis?o basal em alguns trechos. Verificou-se nas an?lises que as tens?es de tra??o atuantes apresentam valores baixos. O principal mecanismo respons?vel por deflagrar os processos de instabilidade ? o aumento parcial da satura??o dos solos ocasionado pelas precipita??es pluviom?tricas, o que diminui sua resist?ncia e gera movimentos de massa. Pelos ensaios realizados observou-se que o intercepto de coes?o dos solos saturados ? em torno de 26% do valor obtido para os solos no teor de umidade natural. Contudo, os ?ngulos de atrito em ambos os casos sofrem inexpressivas varia??es. Concluiu-se que a presen?a da incis?o basal n?o apresentou efeitos significativos na redu??o da estabilidade nas configura??es analisadas pelos m?todos por Equil?brio-Limite, enquanto que pela an?lise de tens?es observa-se um aumento de tens?es de tra??o na face da se??o. O estudo da an?lise de estabilidade realizado neste trabalho representou efetivamente os tipos de ruptura observados nas fal?sias do litoral do Rio Grande do Norte, sendo bem mais coerentes que os obtidos pelos m?todos tradicionais. / This Dissertation treat of obtaining geotechnical properties of sediments of Barreiras Formation and the stability analysis of the cliffs located at the Barreira do Inferno Launches Center, Parnamirim, Rio Grande do Norte State. Coastal areas attracts great interest for the population in general, and developments in these regions are quite common, causing erosive processes to be studied in order to provide a better understanding of the factors influencing the Stability of the cliffs and consequently their safety. The study site in question, being a protected military area, is completely free of human interference and without any edification at its top, making the analysis representative of natural conditions imposed on the slopes studied. The activities developed during the elaboration of this dissertation are grouped in four stages: bibliographic revision, fieldwork, laboratory tests and stability analysis of the cliffs. Based on visits accomplished in situ, information was collected for the subsequent retrieval of the critical profiles of the cliffs for stability analysis. It was observed that the profiles in general aren?t steep, with the presence of basal incision in some areas. It was verified in analyzes that the tensile tensions acting are low. The main mechanism responsible for triggering the instability processes is the partial increase of soil saturation caused by rainfall, which decreases its resistance and generates mass movements. From the tests carried out, it was observed that the cohesion intercept of the saturated soils is around 26% of the obtained value in the natural moisture content. However, the angles of friction in both cases suffer inexpressive variations It was concluded that the presence of the basal incision had no significant effect on the reduction of stability in the configurations analyzed by the limit equilibrium methods, while stress analysis showed an increase in tensile stresses on the face of the section. The study of the stability analysis performed in this work effectively represented the types of rupture observed in the cliffs of the coast of Rio Grande do Norte, being more coherent than those obtained by traditional methods.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-06-02T22:25:24Z No. of bitstreams: 1 AndrieleNascimentoDeSouza_DISSERT.pdf: 14510659 bytes, checksum: b589d39cc71e5725449a5974847ba202 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-06-08T21:37:57Z (GMT) No. of bitstreams: 1 AndrieleNascimentoDeSouza_DISSERT.pdf: 14510659 bytes, checksum: b589d39cc71e5725449a5974847ba202 (MD5) / Made available in DSpace on 2017-06-08T21:37:57Z (GMT). No. of bitstreams: 1 AndrieleNascimentoDeSouza_DISSERT.pdf: 14510659 bytes, checksum: b589d39cc71e5725449a5974847ba202 (MD5) Previous issue date: 2017-03-30 / A Barragem Eng. Armando Ribeiro Gon?alves, mais conhecida como Barragem de A?u, ? uma obra geot?cnica de expressiva notoriedade e import?ncia no Rio Grande do Norte e no Nordeste. Al?m do seu porte ? ? a maior barragem do RN ? e import?ncia, ganhou destaque na literatura nacional e internacional pelo rompimento do talude de montante no final do per?odo construtivo. A partir da an?lise dos dados de instrumenta??o dispon?veis no meio acad?mico, o presente trabalho teve como objetivo analisar o comportamento da obra nas etapas de constru??o do maci?o, primeiro enchimento e opera??o do reservat?rio. Em cada etapa, foi analisado: o comportamento tens?o-deforma??o; a varia??o de poro-press?es; e a estabilidade de taludes. As an?lises foram feitas com os softwares Sigma/W, Seep/W e Slope/W, pertencentes ao pacote Geo-Studio, da empresa Geo-Slope. Os resultados das modelagens foram comparados aos dados da instrumenta??o, dispon?veis em Rocha (2003). Na an?lise comparativa dos deslocamentos verticais, a maior diferen?a entre os resultados da modelagem e os dados da instrumenta??o foi de 8,9 cm, no extens?metro T7, no final do primeiro enchimento. Na an?lise da estabilidade, o fator de seguran?a mais baixo foi de 1,3, fornecido pelo m?todo dos elementos finitos, para o talude de montante, na fase de opera??o do reservat?rio. Entretanto, a m?dia dos fatores de seguran?a obtidos pelos m?todos baseados no equil?brio-limite nesta etapa foi de 2,4. Para o talude de jusante, esse fator foi de 1,6 em todas as etapas. Esses resultados comprovam a condi??o est?vel da barragem de A?u. Na an?lise de poropress?es, os piez?metros pneum?ticos apresentaram maiores diverg?ncias, entre modelagem e instrumenta??o, do que os de tubo aberto. A diferen?a mais expressiva foi de 46% (23 kPa), no piez?metro PZP1, no primeiro enchimento do reservat?rio. Entretanto, considerando as diferen?as obtidas por outros autores que tamb?m estudaram o fluxo nesta barragem, conclui-se que os resultados da an?lise s?o satisfat?rios e que os par?metros adotados s?o adequados para caracterizar os solos modelados. / The A?u Dam is an important geotechnical built in Rio Grande do Norte and in Northeast Brazilian, especially because of its size and complexity. In addition to its size and importance, it has gained prominence in the national and international literature because of the collapse in upstream slope in the end of construction period. This paper aimed to analyze its behavior in stages of dam construction, first filling and operation of the reservoir. In each step, were analyzed: the stress-strain behavior, the flow and the pore-pressure variation, and the slope stability. These analyses were performed with the software Sigma/W, Seep/W and Slope/W, which are components in a suite of geotechnical products called GeoStudio, produced by Geo-Slope International Ltd. The results were compared with the instrumentation dates available in Rocha (2003). In the comparative analysis of vertical displacements, the largest difference between modeling results and instrumentation data was 8.9 cm, in the T7 extensometer, at the end of the first filling. In the stability analysis, the lowest safety factor was 1.3 for the upstream slope in the reservoir operation phase, but the media of the safety factors obtained by the methods based on limit equilibrium was 2.4. For a downstream slope, this factor was equal to 1.6 in all stages. These results confirm the dam stable condition. In pore-pressure analysis, the pneumatic piezometers presented greater divergences between modeling and instrumentation than those of the Casagrande type. The most significant difference was 46% (23 kPa), in the PZP1 piezometer, at the first filling of the reservoir. However, considering the differences obtained by other authors who also studied the water flow in this dam, we conclude that the results of the present analysis are satisfactory and that the adopted parameters are adequate to characterize the soils modeled.