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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, a parametric study of load-settlement behavior, load-carrying ratio, settlement reduction ratio, and stiffness factor, modulus of subgrade reaction and post-failure behavior of slopes reinforced with encased stone columns is presented.
Abstract: The use of industrial waste (ash) in large-scale earthworks for civil engineering applications such as construction of highway embankments, the rise of ash dykes, the filling low-lying areas, fillings of buildings, solves the problem of waste disposal besides in addition to the conservation of the natural soils. It is has a low density, low consolidation, lower potential for bearing and higher settlement. To use these areas for construction purposes, it is necessary to reinforce them at deeper depths. The present study uses highly confined stone columns to investigate the strengthening of ash fills. A total of six cases are investigated, including slope reinforced with an encased stone column. Model tests were conducted with pond ash at 40% relative density with a circular footing on untreated and treated ash fills. The enhanced cases include ordinary stone columns,vertically encased columns with geotextile, vertically encased columns with geogrid, highly confined vertically encased columns with both geotextile and geogrids (HC-1) and highly encased columns with both vertical encased geotextile and horizontal geogrid (HC-2) layers. The parametric study includes an examination of load-settlement behavior, load-carrying ratio, settlement reduction ratio, and stiffness factor, modulus of subgrade reaction and post-failure behavior of slopes reinforced with encased stone columns. In all cases, the high confined encased system yields better results. In each case, the stone column failure pattern of was observed at a distance range of 1–3 times the stone column diameter. Post-failure behavior indicates that for steep slopes where massive slip failures are expected, highly confined encased stone columns can be useful. Results are validated by the numerical modelling analysis of Plaxis.
4 citations
Additional excerpts
...4 (Bowles 1968)....
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01 Jan 2015
TL;DR: In this paper, a solved example is taken for the software assessment and study of different parameters like size of the raft, thickness, diameter of the piles, length of piles which affect the behavior of piled raft foundation is carried out by using Finite Element Software Ansys.
Abstract: 1* The use of piled raft foundations has become more popular in recent years, as the combined action of the raft and the piles can increase the bearing capacity, reduce settlement, and the piles can be arranged so as to reduce differential deflection in the raft. Piled raft foundation is a new concept in which the total load coming from the superstructure is partly shared by the raft through contact with soil and the remaining load is shared by piles through skin friction. In this paper a solved example is taken for the software assessment and study of different parameters like size of the raft, thickness of the raft, diameter of the piles, length of piles which affect the behavior of piled raft foundation is carried out by using Finite Element Software Ansys. This study is useful to decide the various parameters required in the design of piled raft foundation and suggest the suitable combination of Pile Raft Foundation.
4 citations
01 Jan 2012
TL;DR: In this article, a plane strain two-dimensional finite element method is presented to analyze a multilayered nonhomogeneous (Gibson-type) soil by determining the displacements and stresses under strip footing during applied incremental loading sequence.
Abstract: Natural soils are often comprised of separate layers. Foundations of engineering structures are designed to transfer and distribute their loading to the underlying soil and/or rock. Therefore, the designer must ensure that the structure does not suffer from excessive displacements. In this research, it is intended to make a generalized numerical solution through a computer program has written in MATLAB to analyze a multilayered nonhomogeneous (Gibson-type) soil, where the stiffness contrast exists between layers, by determining the displacements and stresses under strip footing during applied incremental loading sequence. This research presents a plane strain two-dimensional finite element method. In this method, the soil is divided into several 4-node quadrilateral elements. The general behavior of a multilayered soil profile and the influences of strip foundations resting on soils having homogeneous (constant modulus with depth) to Gibson-type (linearly increasing modulus) profiles are studied. The influences of foundation size and embedment, incremental loading, and soil stratifications are considered in this study.
4 citations
Cites background or result from "Foundation analysis and design"
...Even very thick ones deflect when loaded by the superstructure loads (Bowles, 1996)....
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...These results agree with that mentioned by Fox in Bowels' book (Bowles, 1996)....
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15 Jul 2017
TL;DR: This paper reviews the literature regarding the development of the analysis methods through time going all the way back to 1867 and the subgrade reaction method by winkler and reaches today and the current state of the art.
Abstract: Today’s structures impose a higher demand on their foundations as their height increases and their designs are more daring and complex. Naturally, the use of pile foundations, which provide the means for transferring the loads to greater depths, is increasing. Despite the advances in the construction of such foundations as well as the advances in software and technology, the analysis of pile foundations and especially those loaded laterally remains a challenge to the engineers. This paper reviews the literature regarding the development of the analysis methods through time going all the way back to 1867 and the subgrade reaction method by winkler and reaches today and the current state of the art. The analysis methods are grouped into the subgrade reaction methods, the ultimate limit state methods, the continuum methods and finally the finite element method. The main objective is to present the fundamentals of each method in an effort to make a contribution to the design of pile foundations by providing a reference and a critical discussion to the geotechnical engineers.
4 citations
08 Mar 2018
TL;DR: Ayrica, calisma sonucunda, saglam temel zemini kosullarindaki betonarme istinat duvarlarinda, duvar onundeki pasif direncin duvar maliyeti uzerinde etkisinin olmadigi anlasilmistir as mentioned in this paper.
Abstract: Uygulamada yaygin kullanim alani bulunan betonarme istinat duvarlarinin analiz ve tasarimi, geoteknik muhendisligi ve yapi muhendisliginin onemli problemlerindendir. Betonarme istinat duvarlarinin stabilitesi degerlendirilirken, ic ve dis stabiliteye dayali cok sayida gocme modunun birlikte dusunulmesi gerekmektedir. Minimum maliyetli betonarme istinat duvari tasarimi; dolgu ozellikleri, temel zemini ozellikleri ve duvar ozellikleri gibi cok sayida parametreden etkilenmektedir. Bu calismada, saglam temel zeminine oturan istinat duvarlarinin maliyeti uzerinde farkli dolgu icsel surtunme acilari, sursarj yukleri, duvar yukseklikleri ve duvarin on kisminda olusacak pasif direnclerin etkilerinin ayri ayri ele alindigi toplam 500 optimizasyon problemi tanimlanmistir. Bu problemlerin cozumu icin, yapay ari koloni (ABC) algoritmasi kullanilarak minimum maliyetli istinat duvari tasarimlari elde edilmistir. Calisma sonucunda, her bir metrelik duvar yuksekligi artisinin duvar maliyetini %31 ile %46 arasinda arttirdigi tespit edilmistir. Her 10 kPa’lik sursarj yuku artisi maliyeti ortalama %12.7 arttirirken, dolgunun icsel surtunme acisindaki artis duvar maliyetini %13.4 ile %18.9 arasinda azaltmaktadir. Ayrica, calisma sonucunda, saglam temel zemini kosullarindaki betonarme istinat duvarlarinda, duvar onundeki pasif direncin duvar maliyeti uzerinde etkisinin olmadigi anlasilmistir.
4 citations
Additional excerpts
...Örneğin, betonun kolay yerleşimini sağlayabilmek için gövdenin üst genişliği (x1) genellikle en az 0,3 m olarak seçilmeli [25, 31], donatı oranları ise kullanılan malzemenin özelliklerine bağlı olarak Eş....
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