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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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01 Mar 2021
TL;DR: In this article, a numerical analysis was performed using PLAXIS software for calculating bearing capacity factor ǫ for rough circular and ring footings on sand, which was carried out using Mohr-Coulomb's criterion for soil.
Abstract: Nowadays, more and more ring footings are used in practice specially for axi-symmetric structures. In this paper, a numerical analysis was performed using PLAXIS software for calculating bearing capacity factor for rough circular and ring footings on sand. The analysis was carried out using Mohr-Coulomb’s criterion for soil. The bearing capacity was calculated for rough circular and ring footings and then the bearing capacity factor was calculated. The effect of different factors such as angle of internal friction of sand, , radius ratio () and different external diameters of circular and ring footings () were studied. The load settlement curves for circular and ring footings were compared, with emphasis on the ultimate bearing capacity. The analysis indicated that radius ratio has a significant effect on the ultimate bearing capacity of ring footings, were ultimate bearing capacity decreases with increasing radius ratio. However, little or no change in bearing capacity factor was observed. Also, the results indicated that there is no significant effect of footing size () on the bearing capacity factor value. It is found that the space in ring footing () has a significant effect on the change of failure mode of soil from both local and punching shear failure to a general shear failure for loose and medium sand, respectively. Also, the space in ring footing has a significant effect on the length and width of failure zone under ring footings. Nowadays, more and more ring footings are used in practice specially for axi-symmetric structures. In this paper, a numerical analysis was performed using PLAXIS software for calculating bearing capacity factor for rough circular and ring footings on sand. The analysis was carried out using Mohr-Coulomb’s criterion for soil. The bearing capacity was calculated for rough circular and ring footings and then the bearing capacity factor was calculated. The effect of different factors such as angle of internal friction of sand, , radius ratio ( ) and different external diameters of circular and ring footings ( ) were studied. The load settlement curves for circular and ring footings were compared, with emphasis on the ultimate bearing capacity. The analysis indicated that radius ratio has a significant effect on the ultimate bearing capacity of ring footings, were ultimate bearing capacity decreases with increasing radius ratio. However, little or no change in bearing capacity factor was observed. Also, the results indicated that there is no significant effect of footing size ( ) on the bearing capacity factor value. It is found that the space in ring footing ( ) has a significant effect on the change of failure mode of soil from both local and punching shear failure to a general shear failure for loose and medium sand, respectively. Also, the space in ring footing has a significant effect on the length and width of failure zone under ring footings.
Cites background or methods from "Foundation analysis and design"
...Some experiments have also been performed to compute the bearing capacity of ring footings [9, 10, 11, 12]....
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...According to Erickson and Dresher's proposal [9], the shape factor can be considered to modify the bearing capacity factors by ?̄?γ = Fγ s....
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...For axially loaded circular footings, which has a diameter of 𝐷𝑜 and rests on the surface of the cohesionless soil (C = 0 and no surcharge) with a unit weight, γ. Erickson and Drescher [9] proposed the generalized bearing capacity formula as follows: - 𝑞𝑢 = 0.5𝐹𝛾𝑠𝛾 𝐷𝑜𝑁𝛾 (5) where 𝐹𝛾𝑠 is the factor accounting for the shape of footings....
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...Erickson and Drescher [9] proposed the generalized bearing capacity formula as follows: qu = 0....
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TL;DR: In this paper, a boundary integral method is used to find an approximate solution to a problem of plane, uncoupled thermoelasticity inside an ellipse with hump, where part of the boundary is under a given variable pressure, while the other part is completely fixed.
Abstract: A previously introduced boundary integral method is used to find an approximate solution to a problem of plane, uncoupled thermoelasticity inside an ellipse with hump. Part of the boundary is under a given variable pressure, while the other part is completely fixed. The singular behavior of the solution is put in evidence at those points where the boundary conditions change. The solution is then sought for in the form of series in Cartesian harmonics, enriched with a specially chosen harmonic function with singular boundary behavior to simulate the existing singularities. The results are analyzed in detail and the functions of practical interest are represented on the boundary and also inside the domain by three-dimensional plots. This model may be useful in analyzing the stresses that arise in long elastic pad supports under real conditions.
Cites background from "Foundation analysis and design"
...For example adding a shear stress on the boundary or treating a multilayer foundation [8]....
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DOI•
08 Feb 2017
TL;DR: In this paper, a finite element methods analysis was carried out assisted by the software Abaqus to predict the mechanical behavior of the soil-pipe system, and a correlation between deformation/failure and relative stiffness of the system was established.
Abstract: . To avoid the economic and environmental lost caused by failing buried pipes, it is a must to predict the mechanical behaviour of the soil-pipe system. That is because different stiffness between the pipe and its surrounding soil leads to different deformations. The objective of this research is to correlate deformation and failure of buried pipes with the soilpipe relative stiffness. To achieve a reliable level of precision, a finite element methods analysis was carried out assisted by the software Abaqus. Different physical and mechanical parameters of both pipe and soil were tested on the FEM software in order to find the desired correlation. When discretizing the soil, an adaptive mesh was necessary. Thus, regions with differently sized elements were created where discontinuity was found to be high. By computing the results of this study, two points were observed. First, ratios of relative stiffness lesser than 1% have a failure controlled by the pipe since external forces are resisted by this structure. Second, a correlation between deformation/failure and relative stiffness of the system was established. Therefore, this research presents a simple and reliable approach in analyzing the failure mode of buried pipes. Keywords: Buried pipes, relative stiffness, finite element methods.
Cites background from "Foundation analysis and design"
...Thus, they were gathered from Bowles (1996), see table 1 and 2....
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...Thus, they were gathered from Bowles (1996), see table 1 and 2. predefined void ratios, and the geostatic one to account for consolidation and/or settlements of the soil layer....
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01 Apr 2022
TL;DR: In this article , a numerical simulation is performed on two piled raft configurations having uniform loading on a piled raft foundation to investigate the interaction between various parameters of pile soil foundation with varying components of its length of pile, diameter and raft thickness.
Abstract: In this paper, the numerical simulation is performed on two piled raft configurations having uniform loading on a piled raft foundation. To investigate the interaction between various parameters of pile soil foundation with varying components of its length of pile, diameter and raft thickness. These components are critical for increasing the foundation’s bearing capacity. It’s important aspect to achieve a reliable design to optimize piled raft foundations subjected to uniformed load- settlement behaviors of the curves. These load – settlements are basically depending on the changing of their components piled raft foundation. These component of piled raft foundations to choose an optimal selection of embedded length of pile (L/dP), normalized diameter of pile (L/dP) and normalized raft thickness (tR/dP). The effect of load-settlement on distributions of shear force and bending moments is also investigated. In this study, a finite elements methods based on numerical tools ELPLA software is used for numerical simulation. The study’s findings validate the numerical analysis for the calculation of proper pile configuration arrangement, as a result of settlements. It will be generated as formation of contours patterns as shear stress and bending moments on the rafts, may be minimized with the total pile length. The conclusion drawn from the study validates the numerical analysis for the computation of proper pile arrangement can results in total and differential settlements, as well as generated shear stress and bending moments on the rafts, are all being reduced, with identical total pile length. Moreover, it captures the contours patterns of different behaviors of piled raft settlements, maximum shear force and maximum moments.
Journal Article•
TL;DR: In this article, the failure probability of piles under lateral loads is analyzed by means of p-y curves, and an inverse analysis is performed to compute the reaction modulus and p-Y curves for piles bored in silty soils.
Abstract: Summary Reliability Base Design (RBD) allows geotechnical engineers to better understand the behavior of systems that depend on soil parameters with a high variability. RBD is used in this work to determine the failure probability of piles under lateral loads. This paper analyzes piles in unstable soils under lateral loads by using resistance and deformation criteria. Pile behavior is analyzed by means of p-y curves. An inverse analysis is performed to compute the reaction modulus and p-y curves for piles bored in silty soils. Reliability base design is implemented to determine a relationship between safety factor, failure probability and applied loads. The main advantages of this method are presented.