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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 article, the suitability of pozzolanic fly ash as a hydraulic barrier and the use of bentonite to enhance geotechnical properties of fly ash was examined not only with water but also with different pore fluids, such as acid, alkali, salts, and neutral organic fluid.
Abstract: This study examines the suitability of pozzolanic fly ash as a hydraulic barrier and the use of bentonite to enhance geotechnical properties of fly ash. The behavior of fly ash is studied not only with water but also with different pore fluids, such as acid, alkali, salts, and neutral organic fluid to assess its chemical compatibility. While some geotechnical properties of fly ash meet the requirements of liner material, the disadvantage of using of fly ash alone is that it has a low cation exchange capacity and high hydraulic conductivity. The compressibility of fly ash reduces with alkaline solution but increases with acidic solutions. While alkaline or neutral inorganic solutions do not affect the hydraulic conductivity of fly ash, the addition of dilute acid increases the hydraulic conductivity. Addition of bentonite improves the geotechnical properties of fly ash such as cation exchange capacity, shrinkage and volume change behavior, etc. Fly ash-bentonite mixtures possess low shrinkage and hence do ...
37 citations
Cites methods from "Foundation analysis and design"
...The coefficient of consolidation cv, was calculated by rectangular hyperbola method (Bowles, 1996)....
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...Coefficient of Consolidation (cv ) The coefficient of consolidation cv, was calculated by rectangular hyperbola method (Bowles, 1996)....
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TL;DR: In this paper, a study of the cause of defects in light structures and the toppling of a wall constructed on a fill material rich in Ankara clay was conducted, and the results showed that in the vicinity of the toppled wall, swelling pressures in the horizontal direction were greater than those measured in the vertical direction.
Abstract: The paper reports a study of the cause of defects in light structures and the toppling of a wall constructed on a fill material rich in Ankara clay. Laboratory tests were carried out on vertical and horizontal samples from boreholes and a trial pit was excavated near the damaged structures. The results showed that in the vicinity of the toppled wall, swelling pressures in the horizontal direction were greater than those measured in the vertical direction. The swelling properties of the fill material were higher than those of original Ankara clay as determined previously by other investigators, suggesting that breakdown of the cementing bonds and a change in the fabric are the main factors affecting the swelling pressure of disturbed and compacted expansive soils. The calculations to predict uplift showed a good agreement with the observations in the damaged structures. It is concluded that swelling was the main cause of the damage to the light structures at the study site and resulted from the highly expansive nature of the fill material, poor drainage, the semi-arid climate, poor construction methods and ineffective precautions. Some recommendations for minimizing the effects of swelling at the study site are briefly outlined.
37 citations
Cites methods from "Foundation analysis and design"
...SPp can be calculated using the equation proposed by Bowles (1989)....
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TL;DR: In this article, a methodology for practical application of the Endurance Time (ET) method in seismic assessment of storage tanks has been presented, which has been applied in three-dimensional nonlinear analysis of a particular anchored steel tank using Finite Element method, and results are compared with conventional codified design procedures.
Abstract: Endurance Time (ET) method is a time history based method for seismic evaluation of structures using intensifying dynamic excitation as the loading function. In this paper, application of this method in the analysis of steel tanks has been investigated. A methodology for practical application of ET method in seismic assessment of storage tanks has been presented. This methodology has been applied in three-dimensional nonlinear analysis of a particular anchored steel tank using Finite Element method, and results are compared with conventional codified design procedures. Results of the analyses indicate reasonable accuracy of the proposed method in estimation of seismic responses of steel tanks and its applicability in enhancing the design process of steel tanks considering various sources of complicated behavior. Comparative study of seismic response of the tank in anchored and unanchored states utilizing ground motions has been presented. Advantages and limitations of the procedure have also been discussed.
37 citations
01 Jul 2006
TL;DR: In this paper, the authors argue that coastal forests and mangroves need to be restored and even created to enhance the capacity of estuaries and coastal waters to provide ecological services to the human population living on their shores.
Abstract: This paper argues that coastal forests and mangroves need to be restored and even created to enhance the capacity of estuaries and coastal waters to provide ecological services to the human population living on their shores. Further, coastal forests and mangroves protect the coast from wind damage, salt spray, coastal erosion, typhoons, and can even save human lives during a tsunami. It is stressed that these coastal bioshields cannot provide complete protection; they must be part of a regional plan to reduce the risk of loss of life, property and infrastructure to an acceptable level. A sacrificial zone within this bioshield must be incorporated in the management plan. The appropriate choice of vegetation depends on the severity of the natural hazards, bathymetry, the climate, the local land use and the available options to survive extreme events. It is stressed that the solution to protecting the coast from natural hazards is not just local; it also involves the whole river catchment. Indeed, vegetation must be used to protect the coastal population from landslides in mountainous areas and along river banks, and large dam operations must ensure that the coarse riverine sediment flow necessary to prevent coastal erosion is maintained. Bioshields, including mangroves, provide important ecohydrological services such as creating self-scoured navigable channels, sheltering coastal seagrass beds and coral reefs from excess sedimentation, and enhancing fishery capacity; these are all resources that human populations living along tropical estuaries and coasts rely on for their livelihoods and quality of life.
37 citations
Journal Article•
TL;DR: In this paper, the bearing-settlement behavior of combined pile-raft foundations on medium dense sand was investigated using a 1g physical model test was performed on a circular rigid raft underpinned with four model piles and numerical simulation was also carried out on the model test, using FLAC-3D to show compatibility of the numerical analysis with the test.
Abstract: The pile-raft foundation is a combination of a raft foundation with piles Pile-raft foundation has been widely designed, assuming all structure loads to be transferred to piles without considering contribution of the load taken by contact surface between raft and soil Methods of analysis currently used in practice are based upon relatively conservative assumptions of soil behavior or on the less realistic soil-structure interaction In this study the bearing -settlement behavior of combined pile-raft foundations on medium dense sand was investigated 1g physical model test was performed on a circular rigid raft underpinned with four model piles Numerical simulation was also carried out on the model test, using FLAC-3D, to show compatibility of the numerical analysis with the test The obtained results showed very good accuracy of the numerical method used in this study as long as the applied load does not exceed the working load, while the performance of numerical model was relatively good for the loads beyond working load
37 citations
Cites background from "Foundation analysis and design"
...60 gr/cm3 and the relative density of soil was obtained to be about 45 percent representing medium sand [11]....
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