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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: A numerical simulation of plate loading test, in order to underline the size effect on settlements and derived values of geotechnical parameters, is shown in this paper, where the results revealed that the subgrade reaction coefficient is strictly dependent on parameters like size of the loaded area and loading magnitude, and thus completely general and generic, and not a fundamental material property of soil that can somehow be determined rationally, as often one claims to be.
Abstract: A numerical simulation of plate loading test, in order to underlines the size effect on settlements and derived values of geotechnical parameters, is shown. The study is based on the comparison between the results obtained by Finite Element Method (FEM) using the Mohr-Coulomb soil model and by some observations from literature. The obtained numerical results revealed that the subgrade reaction coefficient is strictly dependent on parameters like size of the loaded area and loading magnitude, and thus completely general and generic, and not a fundamental material property of soil that can somehow be determined rationally, as often one claims to be.
10 citations
TL;DR: In this paper, the influence of matric suction and soil structure on unsaturated soil slope stability was investigated by using finite element (FE) modules, which can be used to simulate the stability of residual soil slope under different water contents and soil structures.
Abstract: In slope engineering, soils are ordinarily in an unsaturated state. Today the application of unsaturated soil mechanics theory to slope stability analysis has become an essential point in geotechnical engineering research. To explain the relationship between matric suction and soil structure with slope stability (via the pulling-out effect), reasonable finite-element (FE) modules can be created. By using FE analysis (which includes the existing soil parameters), the stability of residual soil slope can be simulated under different water contents (via changes in matric suction) and soil structures (via different Φ values). Inferring from the soil-water characteristic curve obtained from previous work, the influence of matric suction on unsaturated soil slope is determined. The importance of matric suction and soil structure is discovered during the root pulling-out analysis. The results show that because of increasing matric suction in unsaturated soil (which is the result of the decreasing degree ...
10 citations
24 Aug 2007
TL;DR: In this paper, a theoretical, numerical and experimental study of wall pressure in slender silos with the incorporation of stochastic properties of the parameters in pressures models used in the international literature is presented.
Abstract: Vertical silos are structures with a large number of deformations and failures mainly due to misunderstanding of pressure variability of the storage products. The aim of this work is theoretical, numerical and experimental study of wall pressure in slender silos with the incorporation of stochastic properties of the parameters in pressures models used in the international literature. The most relevant parameters of the pressure models were adjusted to the experimental data obtained from a pilot-silo using maximum likelihood function, and for this purpose, Genetic Algorithms (GA) were used in the optimization procedure. The experimental evaluation in pilot-silo was conducted with three different bulk solids, which are: maize, soy and animal feed mixture. With the pressures models parameters, the structural reliability of flat bottom corrugated cylindrical steel silos with was evaluated using Monte Carlo simulation (SMC) to simulate a stochastic process. The results showed that Janssen (1895) and Jenike et al. (1973) pressure models can be used to evaluate the pressures with the parameters uncertainties modeled to lognormal distributions. The reliability index determined in this structural system was less than international recommended values for the design of slender silos.
10 citations
Cites background from "Foundation analysis and design"
...Bowles (1997) fornece os deslocamentos necessários para que o estado ativo seja mobilizado em estruturas de contenção de solos com altura h (Tabela 2.1)....
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...Fonte: Adaptado de Bowles (1997)....
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...Fonte: Adaptado de Bowles (1997) ...................................................................... 22 Tabela 2.2 – Formulações para o valor de K, sugeridos por diversos pesquisadores ........................
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...Fonte: Adaptado de Bowles (1997) Tipo de solo e condição de compactação Deslocamento necessário para desenvolver o estado ativo Pouco coesivo (denso) 0,001 a 0,002.h Pouco coesivo (fofo) 0,002 a 0,004.h Coesivo (firme) 0,01 a 0,02.h Coesivo (mole) 0,02 a 0,05.h onde h é a altura da estrutura de…...
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...Fonte: Adaptado de Bowles (1997)....
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TL;DR: In this paper, two types of natural hydraulic limes (NHL2 and NHL35), in ratios ranging from 3% to 12%, were investigated for the stabilisation of compressed earth blocks, and the results indicated that the addition of NHL2 induced an increase in pore size and volume, in line with the behaviour exhibited by hydrated lime, while the opposite took place when NHL35 was used.
10 citations
TL;DR: In this article, an attempt has been made to predict the load-displacement behavior of driven piles in sand by direct and indirect implementation of the cone penetration test (CPT) data into the displacement field.
Abstract: The bearing capacity of piles is often estimated by a variety of methods such as the limit equilibrium or the limit analysis. In contrast, the load–displacement behavior, which should not be disregarded in common practices, cannot be obtained as simply as the bearing capacity. The reason is its dependency on the stress and the strain (or the displacement) fields around the pile. In the current work, attempt has been made to predict the load–displacement behavior of driven piles in sand by direct and indirect implementation of the cone penetration test (CPT) data into the displacement field. CPT often serves as a very successful in situ test which provides a close link between the soil resistance and the bearing capacity, although it brings no direct information. A rather simple procedure is presented to indirectly use the CPT data to find the stress and strain fields. While the pattern of the failure mechanism has been obtained by the method of stress characteristics, the displacement (and strain) field has been found by the kinematics of the failure mechanism. The proposed procedure has been calibrated and verified by 98 case histories including pile load test results in conjunction with CPT data. Comparisons made by this new method show that the CPT-based method of stress characteristics can be successfully used in load–displacement prediction of driven piles.
10 citations