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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 series of Centrifugal Model Tests (CMTs) were performed to investigate the variation of ground reaction and corresponding derived modulus at different embankment ratios.
Abstract: The objective of this study is to verify the feasibility of using centrifugal model tests to characterize the ground reaction response of a high-speed railway embankment to predict its ground settlement. To do so, a series of Centrifugal Model Tests (CMTs) of the embankment were performed to investigate the variation of ground reaction and corresponding derived modulus at different embankment ratios. The ground reaction determined from the CMTs was compared with those obtained from corresponding full-scale field tests of instrumented embankment. The results show that the ground reaction at the embankment centreline gradually approaches the embankment weight (γH) with increasing embankment ratio. Considering the embankment filling process with different embankment ratios, it seems inappropriate to employ the value of γH as the ground reaction without any correction in settlement prediction. Finally, the predictive capability of the proposed approach for embankment settlement estimation was assessed against the corresponding field measurements and those determined based on the calculation methods suggested in the current design standard in China. The results show that the proposed simple approach satisfactorily estimates the ground settlement of HSR embankments and its deviation of predicted settlements is below 11.9% compared with the data obtained from the field full-scale tests. However, the deviation of the result calculated by the current recommend design standard is 17.7%-148.3%.
3 citations
TL;DR: In this article, the authors tried to represent the behavior of shallow foundations under the effect of eccentric inclined loading in terms of the main criteria of design which are the ultimate bearingcapacity, permissible settlement, horizontal displacement and tilt.
Abstract: The present study attempts to represent the behavior of shallow foundations under the effectof eccentric inclined loading in terms of the main criteria of design which are the ultimate bearingcapacity, permissible settlement, horizontal displacement and tilt. Due to the square shape of the analysed foundations, three dimensional finite element analysis are used. Elastic-perfectly plastic behavior of soil and rigid of foundations was adopted using MohrCoulomb criterion, 15-Node wedge elements were used to model and represent the soil and 5-Node linear elements with three degree of freedom to model and represent the foundations in used program PLAXIS 3D TUNNEL version 1.2. The results of analysis were presented in the form of pressure-settlement, pressure-horizontal displacement and pressure-tilt characteristics. Then the ultimate bearing capacity of the foundations were gotten and compared with (Meyerhof, 1956) and (Saran & Agrawal, 1991), a good agreement was found between them. Using the data obtained from the analysis, nondimensional correlations have been developed for predicting the values of settlement, horizontal displacement and tilt of eccentrically-obliquely loaded foundations. These relationships can be used by the engineers.
3 citations
Cites background from "Foundation analysis and design"
...The lateral and bottom boundaries of the finite element meshed were change according to the width of footing (Bowels, 1988)[12]....
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29 Sep 2020
TL;DR: The effect of slurry viscosity and construction time on the shaft friction capacity of cast in situ bored piles have been studied by various investigators in the past but the extent to which these parameters effect the shaft capacity is still not clear as discussed by the authors.
Abstract: Effect of construction time and slurry viscosity on the shaft friction capacity of cast in situ bored piles have been studied by various investigators in the past but the extent to which these parameters effect the shaft capacity is still not clear. Major obstacle in this regard is that it is hard to normalize the shaft capacity degradation against other numerous parameters which are influencing simultaneously. Results from eleven pile load tests, constructed with different slurry viscosities and construction times, in the layered alluvial strata of Bangkok are presented in this paper. It has been concluded that slurry viscosity, do not have significant effect on the shaft load transfer of these piles but considerably reduced with increase in construction time. Trend of reduction in capacity seems to follow an exponential decrease with increase in construction time with major part of degradation within first 24 hours of construction time. -60 -50 -40 -30 -20 -10 0 0 2 0 4 0 6 0 P o re P re ssure (t/m )
3 citations
01 Jan 2014
TL;DR: In this paper, a real practical problem of an on-shore container yard in Um Qaser Port-Basra province is solved, where the pile and surrounding soil are modeled as three-dimensional brick elements.
Abstract: The finite element method, along with an elastoplastic constitutive model, is used to investigate the response of laterally l oad- ed single pile and pile groups in sand. Also, a real practical problem of an on-shore container yard in Um Qaser Port-Basra province is solved. The pile and surrounding soil are modeled by three-dimensional brick elements. The pile is modeled as a deformable body with lin- ear elastic material properties, while the soil is modeled as an elasto-plastic Mohr-Columb continuum material. The effect of pile-soil-pile in- teraction (group action) is investigated by studying the effect of pile spacing on the behavior of two group configurations; namely (3×1) row and (2×2) square groups. The lateral pressure distributions and the p-y curves are obtained and the p-multipliers are calculated for all piles. For the (3×1) configuration, it is found that the p-multipliers of the leading piles are greater than their counterparts of the trailing and middle piles. Their values are around one, for the leading piles for all spacing values, and nearly equal for the other two. For the (2×2) square configuration, p-multipliers are greater for the leading piles than the trailing piles up to a spacing of, approximately, five times pile diameter. They approach unity at a spacing of six times pile diameter. The group efficiency is increased with pile spacing an d approaches (100%) at a spacing of seven times pile diameter for the two group configurations.
3 citations
TL;DR: In this article, the design of two automotive test benches for fatigue and comfort assessment of cars is illustrated, and the vibration isolation of such test benches, designed to operate under arbitrary load histories in the frequency range 0-200 Hz, has been obtained with a fibre-reinforced concrete mass equipped with a dual suspension system.
3 citations