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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Atrito lateral e resistência de base em tubulões a céu aberto em solos colapsíveis / Skin friction and base resistance of large diameter bored piles in collapsible soils

Túlia Ribeiro da Silva Santos 13 June 2001 (has links)
Este trabalho apresenta resultados de provas de carga em tubulões a céu aberto, com o monitoramento do teor de umidade através do processo de tradagem, a cada metro, até uma profundidade de 9,0 m, em um maciço de solo não-saturado e colapsível, representativo da região centro-oeste do interior do Estado de São Paulo. Ao todo, realizaram-se dez provas de carga, no Campo Experimental de Fundações da EESC/USP, com e sem inundação do terreno, com carregamento do fuste, foram introduzidas placas de isopor (E.P.S) a fim de, durante a realização dos ensaios, obter separadamente as parcelas de resistência de base e por atrito lateral. A partir dos dados obtidos, procedeu-se uma análise da influência da pressão de sucção, da inundação do terreno e do intervalo de tempo entre a escavação e os outros dois, concretados logo após a etapa de escavação. Observou-se que a sucção tem um efeito importante no comportamento dos tubulões a céu aberto: com o aumento da sucção maiores se tornam as resistências de base e por atrito lateral. Consequentemente, a influência do colapso apresenta-se mais significativa com o aumento da pressão de sucção. / This work presents results of static load tests, in large diameter bored piles, with measurements of soil moisture content in an unsatured collapsible soil, considered as representative of the middle - west region of the State of São Paulo, Brazil. Ten load tests were performed at Foundation Experimental Field of the EESC/USP, with and without wetting of the pit and the with quick maintained load (QML). In the large diameter bored piles were introduction, between the base and the shaft, an layer of \"isopor\", to separate the skin friction and the base resistance, during the static load tests. The gathered data allowed an assessment of the influence the soil suction, of the soil soaking and the effect between excavation and concrete in the behaviour these isolate elements of foundation.
12

Thermo-Hydro-Mechanical Effects of Climate Change on Geotechnical Infrastructure

Robinson, Joe Dylan 12 August 2016 (has links)
The main goal of this research is to quantitatively assess the resilience and vulnerability of geotechnical infrastructure to extreme events under a changing climate. In the first part, pertinent facts and statistics regarding California’s extreme drought and current status of its levees are presented. Weakening processes such as soil strength reduction, soil desiccation cracking, land subsidence and surface erosion, and oxidation of soil organic carbon are comprehensively evaluated to illustrate the devastating impacts that the California drought can have on earthen structures. In the second part, rainfall-triggered slope instabilities are analyzed using extreme precipitation estimates, derived using the historical stationary and a proposed future nonstationary approach. The extremes are integrated into a series of fully coupled 2D finite element simulations. The final part of this study investigates the impact of simultaneous variations in soil moisture and temperature changes in the California region on soil strength through a proposed thermo-hydro-mechanical framework.

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