Book•
Foundation analysis and design
01 Jan 1968-
TL;DR: In this paper, Fondation de soutenagement et al. presented a reference record for Dimensionnement Reference Record created on 2004-09-07, modified on 2016-08-08.
Abstract: Keywords: Fondation ; Mur de soutenement ; Pieux ; Capacite portante ; Ancrage ; Dimensionnement Reference Record created on 2004-09-07, modified on 2016-08-08
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TL;DR: In this paper, the authors compared eight popular methods for the prediction of immediate settlement of shallow foundations resting on cohesive soils and concluded that the results obtained from the comparisons of the methods evaluated in this study are considerably different depending on the ratios of L/B and Df/B.
Abstract: Many methods are available in literature for the prediction of immediate settlement of shallow foundations resting on cohesive soils. Of these, eight popular methods that are commonly used in practice are summarized briefly and compared using both hypothetical and real cases. In hypothetical cases, various scenarios with respect to the foundation geometry and embedment depth (i.e., different L/B and Df/B ratios) under fixed loading and soil conditions were considered. Real cases, including all parameters required for the immediate settlement computations, were derived from literature after intensive effort. The results obtained from the comparisons of the hypothetical cases showed that the immediate settlements computed by the methods evaluated in this study are considerably different depending on the ratios of L/B and Df/B . When the real cases were considered, for the majority of the cases, the best settlement estimates were obtained from the Bowles method. However, for mat foundations, the best settlement estimates were obtained from the Mayne method. In addition, immediate settlement values of foundations founded on multi-layer soil profiles were also compared for both hypothetical and real cases. Two soil layers having different elastic modulus and thickness under fixed loading conditions, embedment depth, and aspect ratio for the foundation were considered in the hypothetical cases. Immediate settlements were calculated by weighted mean, harmonic mean, and principles of superposition in conjunction with the Mayne method, as well as with the full Mayne method with Gibson modulus. Results obtained from the hypothetical cases demonstrated that the immediate settlements calculated by these procedures are remarkably different depending on the variation in the elastic modulus and thickness of the soil layers. For the evaluation of real cases, immediate settlements were calculated by both Mayne and Bowles methods, as well as with the full Mayne method itself. As a result, the full Mayne method with Gibson modulus was determined to produce perfect settlement estimates for real cases compared with the conventional procedures such as weighted mean, harmonic mean, and principles of superposition. In addition, among conventional procedures, principles of superposition in conjunction with the Bowles method provide comparable settlement estimates to the full Mayne method.
1 citations
Journal Article•
TL;DR: In this article, the effects of dilatometer penetration on the soil parameters estimated from the dilatometers data in sands were investigated, and the results indicated that the relation between the in situ earth pressure and the lateral earth pressure measured after dilatometry penetration is a function of particle shape characteristics as well as relative density and vertical overburden pressure.
Abstract: In situ evaluation of soil parameters in the lateral direction such as the at-rest lateral earth pressure coefficient, lateral subgrade coefficient, and lateral soil modulus is required for a variety of soil-structure interaction analyses. A practical device to estimate these parameters is the flat dilatometer. The flat dilatometer requires, however, as do most other in situ penetrometer-type devices, calibration under simulated in situ conditions for possible extrapolation of the results to undisturbed soil conditions. A series of laboratory experiments was conducted to investigate the effects of dilatometer penetration on the soil parameters estimated from the dilatometer data in sands. With regard to the at-rest lateral earth pressure coefficient, the results indicated that the relation between the in situ earth pressure and the lateral earth pressure measured after dilatometer penetration is a function of particle shape characteristics as well as relative density and vertical overburden pressure. The lateral subgrade coefficient and the lateral soil modulus were found to be reasonably linear functions of the corresponding soil parameters determined from the dilatometer data, namely the dilatometer subgrade reaction coefficient and the dilatometer modulus. The range of uncertainty, however, was found to increase with the angularity of the particles in soil. Both particle shape and relative density become controlling factors for the slope and linearity of these relationships in soils composed of angular particles.
1 citations
01 Jan 2003
1 citations
TL;DR: In this article, the effects of the relative thickness of the top strong clay, the strength ratio of clay layers and the size of spudcan foundation were investigated, and the soil flow mechanisms at various penetration depths were also discussed.
Abstract: Jack-up rigs are a popular offshore structure in medium water depth due to its mobility. Spudcan foundations are normally used to support each individual jack-up leg. When the seabed soils display a strong soil layer overlaying a soft soil layer, during foundation penetration, punch-through failure may occur. In this study, large deformation finite element (LDFE) analyses have been conducted to simulate spudcan continuous penetration into strong over soft clay soils. The numerical simulation was carried out using Remeshing and Interpolating Technique with Small Strain (RITSS) model. The LDFE/RITSS results were compared with existing data. The effects of the relative thickness of the top strong clay, the strength ratio of clay layers and the size of spudcan foundation were investigated. The soil flow mechanisms at various penetration depths were also discussed. It was found that the spudcan punch-through failure potentials increase with increasing top layer thickness. Moreover, it was also noticeab...
1 citations
Cites methods from "Foundation analysis and design"
...Methods for calculating the bearing capacity of multilayer soils range from averaging the strength parameter (Bowles, 1988), using limit equilibrium considerations (Button, 1953), to a more rigorous limit analysis approach (Chen and Davidson, 1973)....
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01 May 1998
TL;DR: CUTINSHEAR et al. as discussed by the authors performed performance assessment of an innovative structural FRP strengthening technique using an integrated system based on optical fiber sensors, using an optical fiber sensor network.
Abstract: Fundacao para a Ciencia e a Tecnologia (FCT) - POCTI/ECM/59033/2004 “CUTINSHEAR - Performance assessment of an innovative structural FRP
strengthening technique using an integrated system based on optical fiber sensors”
1 citations