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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 influence of vertical loads on the lateral response of piles was analyzed in both homogeneous clayey and homogeneous sandy soils and it was shown that vertical loads significantly increase the capacity of piles in sandy and marginally decrease the capacity in clayey soils.
Abstract: The laboratory and field test data on the response of piles under the combined action of vertical and lateral loads is rather limited. The current practice for design of piles is to consider the vertical and lateral loads independent of each other. This paper presents some results from three-dimensional finite-element analyses that show the significant influence of vertical loads on a pile's lateral response. The analyses were performed in both homogeneous clayey soils and homogeneous sandy soils. The results have shown that the influence of vertical loads on the lateral response of piles is to significantly increase the capacity in sandy soils and marginally decrease the capacity in clayey soils. In general, it was found that the effect of vertical loads in sandy soils is significant even for long piles, which are as long as 30 times the pile width, while in the case of clayey soils, the effect is not significant for piles beyond a length of 15 times the width of the pile. The design bending moments in the laterally loaded piles were also found to be dependent on the level of vertical load on the piles.
170 citations
TL;DR: In this article, a scale-model energy foundation installed in an unsaturated silt layer with endbearing boundary conditions was evaluated using embedded strain gauges and thermocouples.
Abstract: This study presents a centrifuge modeling approach to characterize the transient thermomechanical response of energy foundations during heating-cooling cycles to provide data for calibration and validation of soil-structure interaction models. This study focuses on the response of a scale-model energy foundation installed in an unsaturated silt layer with end-bearing boundary conditions. The foundation response was assessed using embedded strain gauges and thermocouples. Other variables monitored include foundation head displacements, soil surface displacements, and changes in temperature and volumetric water content in the unsaturated silt at different depths and radial locations. Measurements during the initial heating process indicate that the thermal axial stress is greater near the toe of the foundation as a result of the restraint associated with mobilization of side shear resistance along the length of the foundation. The thermal axial strains were close to the free-expansion thermal strain...
165 citations
TL;DR: In this article, the influence of vertical loads on the lateral response of piles installed in sandy soils is brought out through 3-dimensional finite element analyses, where the pile was treated as a linear elastic material and the soil was idealized using the Drucker-Prager constitutive model with a nonassociated flow rule.
157 citations
TL;DR: In this article, the bearing capacity of strip footings over a two-layer foundation soil is considered and the kinematic approach of limit analysis is used to calculate the average limit pressure under footings.
Abstract: The bearing capacity of strip footings over a two-layer foundation soil is considered. The kinematic approach of limit analysis is used to calculate the average limit pressure under footings. The method is applicable to any combination of parameters of the two layers, but the results are presented only for a specific case when a footing is placed on a layer of granular soil resting on clay. The depth of the collapse mechanism is found to be very much dependent on the strength of the clay. Very weak clay can “attract” the mechanism even at great depths. The results are presented as limit pressures rather than traditional bearing-capacity coefficients. The latter are strongly dependent not only on the internal friction angle of the sand, but also on the thickness of the sand layer, cohesion of the clay, and surcharge pressure. Results are presented in the form of dimensionless charts for different internal friction angles of sand. It was found that linear interpolation within 5° increments is acceptable in ...
153 citations
TL;DR: In this paper, a simple method for computing the dynamic steady-state axial response of floating pile groups embedded in homogeneous and non-homogeneous soil deposits is presented, which is essentially independent of pile flexibility and slenderness.
Abstract: SUMMARY Simple methods of analysis are developed for computing the dynamic steady-state axial response of floating pile groups embedded in homogeneous and non-homogeneous soil deposits. Physically-motivated approximations are introduced to account for the interaction between two individual piles. It is found that such an interaction arises chiefly from the ‘interference’ of wave fields originating along each pile shaft and spreading outward. For homogeneous deposits the wave fronts originating at an individual pile are cylindrical and the interaction is essentially independent of pile flexibility and slenderness. For non-homogeneous deposits the wave fronts are non-cylindrical and ray-theory approximations are invoked to derive pile flexibility-dependent interaction functions. Results are presented for the dynamic stiffness and damping of several pile groups, as well as for distribution of the applied load among individual piles. For deposits with modulus proportional to depth, the agreement with the few rigorous solutions available is encouraging. A comprehensive parameter study focuses on the effects of soil inhomogeneity and pile-group configuration. It is demonstrated that the ‘dynamic group efficiency’ may far exceed unity at certain frequencies. Increasing soil inhomogeneity tends to reduce the respective resonant peaks and lead to smoother interaction functions, in qualitative agreement with field evidence.
150 citations