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Previous issue date: 2017-03-30 / Este trabalho tem por objetivo avaliar as condi??es de susceptibilidade a
ocorr?ncia de movimentos de massas e a estabilidade de encostas do Centro de
Lan?amentos da Barreira do Inferno (CLBI), mediante o m?todo da redu??o da
resist?ncia ou SRM (Strength Reduction Method), sob condi??es n?o saturadas no
Nordeste de Brasil. Para a an?lise da susceptibilidade a ocorr?ncia de movimentos de
massas foi utilizada a metodologia de processo de an?lise hier?rquica ou AHP
(Analytic Hierarchy Process) em combina??o com o uso dos sistemas de informa??o
geogr?fica SIG. A determina??o dos par?metros de resist?ncia dos solos, foi realizado
atrav?s de ensaios de compress?o triaxial tipo CU em condi??es saturadas, e ensaios
de compress?o triaxial tipo CW para a condi??o de umidade residual. Para a
determina??o das curvas de reten??o dos solos foi usado o m?todo do papel filtro, e
as equa??es de Chandler et al. (1992) e posteriormente foi realizado o ajuste das
curvas de reten??o pelo m?todo de Van Genuchten (1980). A partir dos resultados de
ensaios triaxiais, foi ent?o, realizada a previs?o da resist?ncia ao cisalhamento dos
solos n?o saturados a partir do modelo hiperb?lico proposto por Vilar (2007). A partir
das se??es suscept?veis ? ocorr?ncia dos movimentos de massa e dos par?metros de resist?ncia dos solos estudados, foram realizadas an?lises da estabilidade das
encostas a fim de quantificar o fator de seguran?a das mesmas. O m?todo utilizado
nas an?lises de estabilidade foi o SRM, implementado no Software OPTUM,
considerando diferentes condi??es de satura??o, a saber: solos sob condi??o natural
de campo, solo com 50% do grau de satura??o e, por fim, considerando o solo
completamente saturado. Nas an?lises foram consideradas tamb?m a presen?a de
camadas de solo cimentado e fendas de tra??o presentes no topo da fal?sia. Ao todo
a encosta foi subdividida em tr?s solos predominantes, os quais est?o posicionados
na base, na se??o intermedi?ria e no topo da fal?sia, denominados solo-1, solo-2 e
solo-3, respectivamente. Estes solos foram caracterizados como areia argilosa (SC),
areia Silto-Argilosa (SM), areia mal graduada (SP). Quanto as curvas de reten??o, os
tr?s solos apresentam comportamento bimodal, t?picas de solos com granulometrias
de material com macroporos e microporos. Finalmente os resultados obtidos destas
an?lises num?ricas, foram relacionados inicialmente com o modelo de
susceptibilidade produzido a partir da metodologia AHP-SIG, concluindo que este
modelo encontra-se em boa concord?ncia, evidenciado pelos resultados das an?lises
num?ricas e pelos vest?gios de movimentos vistos em campo. Os resultados das
an?lises tamb?m foram relacionados com os tipos de movimentos de massa,
concluindo que tanto os fatores geomorfol?gicos, quanto os graus de satura??o
resultam em diferentes tipos de movimentos para se??es caracter?sticas pr?prias
destas geomorfologias (fal?sias), verificando desta forma os movimentos sugeridos
nos estudos de Santos Jr et al.(2004) e Souza J?nior (2013), onde foram relacionados
tr?s tipos de perfis com diferentes morfologias e seus poss?veis movimentos de
massa, tombamentos, quedas de blocos e escorregamentos. / The aim of this research is to evaluate the susceptibility conditions to the
occurrence of mass movements and slope stability of the Center of Launches from
Barreira do Inferno (CLBI) using the method of Strength Reduction Method ou SRM,
on unsaturated conditions in the Northeast of Brazil. The analysis of the susceptibility
to the occurrence of mass movements, the methodology called the Analytic Hierarchy
Process was used along with the GIS geographic information systems. In order to
determine the resistance parameters of the soils, triaxial compression tests were
carried out under saturated conditions CU and triaxial compression tests CW were
performed for the residual moisture condition. The determination of soil retention
curves, the filter paper method was considered, equations by Chandler et al. (1992),
and the adjustment of the retention curves developed by Van Genuchten (1980). From
the results of the triaxial tests, the prediction of the shear strength of the unsaturated
soils was performed using the hyperbolic model proposed by Vilar (2007). Then, from
the susceptible sections to the occurrence of mass movements and the resistance
parameters of the studied soils, analyzes of slope stability were applied with the
intention of quantify the safety factor of the same. The method used in the stability analyzes was the SRM, implemented in the OPTUM Software, considering different
saturation conditions, as follows: soil under natural field saturation condition, soil with
50% degree of saturation, and finally Completely saturated soil. The analysis also took
into account the presence of layers of cemented soil and traction cracks present in the
upper part of the cliff. The slope was divided into three sections with predominant soils,
which were positioned at the base of the intermediate section, and at the top of the
cliff, called soil-1, soil-2, and soil-3 respectively. These soils were characterized as
clayey sand (SC), silty sand (SM) and poorly graded sand (SP). As for the retention
curves, the three soils present bimodal behavior, typical of soils with granulometry of
material with micropores and macropores. Finally, the results obtained from these
numerical analyzes were initially related to the model of susceptibility produced from
the AHP-GIS methodology, concluding that this model is in good agreement,
evidenced by the results of the numerical analysis and by the vestiges of Movements
observed in the field. The results of the numerical analyzes were also related to the
types of mass movements, presenting as an outcome that both geomorphological
factors and degrees of saturation result in different types of movements for the
characteristic sections of these geomorphologies (cliffs). Verifying in this way the
movements suggested in the studies of Santos Jr et al. (2004) and Souza Junior
(2013), where three types of profiles with different morphologies and their possible
mass movements, toppling, fall of blocks and landslides were related.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/23723 |
| Date | 30 March 2017 |
| Creators | Taquez, David Esteban Diaz |
| Contributors | 04738377493, http://lattes.cnpq.br/6335708403185496, Santos J?nior, Olavo Francisco dos, 35816384449, http://lattes.cnpq.br/1573496204231636, Rodrigues, Roger Augusto, 25710057827, http://lattes.cnpq.br/8656303055040496, Scudelari, Ada Cristina, Freitas Neto, Osvaldo de |
| Publisher | 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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