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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 bearing capacity of shallow foundations is investigated by both the shear strength and the geometry of the problem, and the finite element and the limiting equilibrium methods are applied to investigate the problem in detail.
Abstract: The bearing capacity of shallow foundations is affected by both the shear strength and the geometry of the problem. In this regard, the neighboring of two or more shallow foundations can affect their bearing capacity, which has been studied in this research. The finite element and the limiting equilibrium methods are applied to investigate the problem in detail. In traditional bearing capacity problem, the effect of a uniformly distributed surcharge at the level of the footing base or, at the ground level, which is governed by the second bearing capacity term has been well studied. The main emphasis of this research is on the effect of a finite area in the proximity of the footing, which is loaded uniformly. The main goal of this research is to estimate the bearing capacity of neighboring strip footings on sand and to find distances maximizing or minimizing the ultimate bearing pressure. A series of correction factors have been presented which represent the effect of neighboring of two footings and they can be used to find the reduced and/or increased bearing capacity.
7 citations
TL;DR: In this paper, a parametric study is carried out to investigate the behavior of ordinary and encased floating stone columns in different conditions, and different parameters are studied to show their effect on the bearing improvement and settlement reduction of the stone column.
Abstract: The finite element method is utilized as a tool for carrying out different analyses of stone column-soil systems under different conditions. A trial is made to improve the behaviour of stone columns by encasing them by geogrid as reinforcement material. The program CRISP-2D is used in the analysis of problems. The program allows prediction to be made of soil deformations considering Mohr-Coulomb failure criterion for elastic-plastic soil behaviour. A parametric study is carried out to investigate the behaviour of ordinary and encased floating stone columns in different conditions. Different parameters are studied to show their effect on the bearing improvement and settlement reduction of the stone column. These include the length to diameter ratio (L/d), the area replacement ratio (as) and thickness of the stone cap layer. It was found that for encased stone column, the bearing improvement ratio increases with the increase of length to diameter (L/d) even when (L/d) ratio becomes more than 8 for all area replacement ratios. This means that in case of encased stone column, there is no limitation on the effective (L/d) ratio. The strength of stone column increases when encased with geogrid compared with ordinary stone column and the increasing in bearing capacity (q treated /q untreated) is higher when (L/d) increases. The use of stone cap above the stone column increases the bearing improvement ratio and decreases the settlement for all L/d ratios. The increase in stone cap thickness increases the bearing improvement ratio and decreases settlement for all L/d ratios.
7 citations
Cites background from "Foundation analysis and design"
...The modulus of elasticity E of the clay is assumed to be = Cu × 250 (E = 200 to 500 × Cu) (Bowles, 1996) [6]....
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TL;DR: In this paper, the authors focused on the numerical analysis of the undrained bearing capacity for a strip footing near a slope, and subjected to a centered vertical load, using the explicit finite difference code FLAC (Fast Lagrangian Analysis of Continua).
Abstract: The bearing capacity of shallow foundation near slope has always been one of the subjects of major interest in geotechnical engineering for researchers and practical engineers. This study focuses on the numerical analysis of the undrained bearing capacity for a strip footing near a slope, and subjected to a centered vertical load, using the explicit finite difference code FLAC (Fast Lagrangian Analysis of Continua). Theoretical and experimental studies confirm that, when a strip footing is near a slope, the bearing capacity must be assessed using reduction coefficients. In this study, several geometrical and mechanical parameters have been considered in order to evaluate the effect of the slope on the undrained bearing capacity. The numerical values have been compared with those available in the literature. The results show the influence on the undrained bearing capacity of the location of the footing with respect to the slope.
7 citations
TL;DR: In this article, the authors developed a chart that structural engineering practitioners can use to quickly quantify the restraining effect at the bases of columns and walls supported on shallow foundations, and calculated rocking responses for rigid footing models under combined axial load and moment are found to compare reasonably well with experimental results.
7 citations
14 Oct 2007
TL;DR: In this paper, a full-scale test embankment incorporating a geosynthetic-reinforced LTP and supported by rammed aggregate piers (geopiers) was built in Malaysia.
Abstract: Column-supported embankments provide a rapid means of construction in areas where subsurface consists of fine-grained soft soils. A load transfer platform (LTP) is usually provided at the base of the embankment to even out differential settlement and minimize overall deformation of the embankments. The mechanism of load transfer in geosynthetic-reinforced LTPs (GRLTP) supported on columns is, in general, poorly understood. Especially, the case of soil arching within the embankment fill from which the proportion of the embankment load that is transferred to the columns and to the subsoil is determined. A well instrumented full- scale test embankment incorporating a catenary GRLTP and supported by rammed aggregate piers (geopiers) was built in Malaysia. The results of the numerical analysis and its relation to field data are presented along with implications for arching ratio. Overall, the relatively simple elastic-perfectly plastic Mohr-Coulomb constitutive model was able to capture the essential embankment/load transfer platform behavior based on conventional data regarding material properties and subsurface conditions. The arching ratio assumed in the design of catenary load transfer platform based on the British design method is significantly higher than that indicated by the field-calibrated numerical analysis and the field measurements.
7 citations