Book•
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
Citations
More filters
21 Nov 2019
TL;DR: In this article, the estimation of the concrete's elastic modulus in this type of foundation based on experiments on samples extracted from the foundation piles and concrete quality control testing results is discussed. But, the results indicate that the methodologies prescribed by technical standards overestimate by 60% the elastic deformation of the structural element in this case studied.
Abstract: In modern foundation design projects, the estimation of the foundation settlement has fundamental importance in determining the characteristic stresses. Specifically, in case of continuous flight auger (CFA) piles, the elastic deformation of the structural element has special importance, since the execution process of the pilling and the properties of the concrete used can generate materials with high deformability. This study discusses the estimation of the concrete’s elastic modulus in this type of foundation based on experiments on samples extracted from the foundation piles and concrete quality control testing results. The application of these procedures is compared to the concrete of the superstructure. The results indicate that the methodologies prescribed by technical standards overestimate by 60% the elastic modulus value in this case studied. However, estimates of the elastic modulus of concrete subjected to low stresses may be closer to field conditions, but still underestimating the settlement of the structural element
1 citations
Additional excerpts
...http://doi.org/10.24849/j.geot.2019.147.03 – © 2019 Sociedade Portuguesa de Geotecnia profundas (Poulos e Davis, 1968; Vésic, 1969; Randolph e Wroth, 1978; Aoki, 1984; Bowles, 1996)....
[...]
29 Apr 2021
TL;DR: In this paper, the authors focused on the settlement behavior of soil after 1 year of operation with a lot of cracks and gaps in the current slab, and used a new soil investigation with advanced laboratory tests and in situ plate load tests.
Abstract: It is noted that the settlement estimation using the D-box method (soil bag system) with a high thickness of the filling layer would have a high potential of risk, especially in the time-dependent calculation. Based on the requirements of solutions for the settlement problem of the ground-treated system in the Asia-Vietnam fertilizer factory (AVF factory), this research focuses on the settlement behavior of soil after 1year of operation with a lot of cracks and gaps in the current slab. This study used a new soil investigation with advanced laboratory tests and in situ plate load tests. In calculation, four cases of the strategy were investigated to predict the real behavior and the time-dependent settlement. The results show that the consolidation settlements of the D-box method were 112.62 cm, 205.28 cm, 219.57 cm, and 287.12 cm for case 1, case 2, case 3, and case 4, respectively. The settlement of the second year increased about 2% in comparison with the one of the first year, and this process performed that case 1 was suitable for the observed settlement behavior of D-box ground-treated system.
1 citations
DOI•
03 Nov 2015TL;DR: In this article, a 2D numerical model using finite element software, PLAXIS 2D, has been employed to analyze the behavior of the pile group foundation, and several parametric studies, including numbers of piles, overturning moment ratios, stiffness of pile cap, and pile spacing, are also presented.
Abstract: Studies about pile group foundation have been rapidly increasing in number over the past years. However, past research works focused on pile settlement with consideration of a purely vertical load for pile groups or pile raft foundations. There were few studies with an emphasis on pile load distribution of pile group foundations together with a combined vertical load and a large overturning moment. For example, the foundation of a wind turbine carries a large overturning moment and vertical forces at the base of the structure. This paper presents a numerical study of load distribution of pile group foundations. A 2D numerical model using finite element software, PLAXIS 2D, has been employed to analyze the behavior of the pile group foundation. In the scope of analysis, pile group foundation consisting of large numbers of regular grid piles with a cross section of the strip of the pile row can be analyzed with a 2D model. For structural modeling, each pile is modeled as the embedded pile row. Modeling of pile group foundation is achieved by creation of a small gap between the plate element of the pile cap and the underlying soil, while the pile cap is rigidly connected with a small vertical plate segment which is hinged at the top of the embedded pile row. Several parametric studies, including numbers of piles, overturning moment ratios, stiffness of pile cap, and pile spacing, are also presented in this paper.
1 citations
Additional excerpts
...Bowles [1]) as; Fi = P N ± Myxi ∑xi2 + Mxyi ∑yi2 (1)...
[...]
05 Jan 2009
Abstract: ..................................................................................................................................... ii ACKNOWLEDGEMENTS ............................................................................................................... iv TABLE OF CONTENTS ................................................................................................................... v LIST OF TABLES ............................................................................................................................. x LIST OF FIGURES AND ILLUSTRATIONS ...................................................................................xiv CHAPTER
1 citations
Dissertation•
01 Dec 1998
TL;DR: In this article, the effect of two-layer cohesive soil system in the engineering behavior of a laterally loaded pile is investigated analytically, and a finite difference method is used to study the load-displacement response and horizontal load capacity of vertical unrestrained piles subjected to lateral load using a finite-difference method.
Abstract: The present investigation has been conducted to study the load-displacement response and horizontal load capacity of vertical unrestrained piles subjected to lateral load using a finite difference method. Generally unifonn soil deposits are not found in nature and the piles are embedded in layered soils. The effect of two-layer cohesive soil system in the engineering behaviour of a laterally loaded pile is investigated analytically. Pile deflection often governs the design of laterally loaded piles, as such the possibility of reducing the pile head deflection using a stiff layer near the ground level has been investigated For piles subjected to a given horizontal load the deflection at pile head, is smaller for piles embedded in stiff soils than piles embedded in soft soils. Therefore the allowable capacity [the allowable horizontal load capacity according to BNBC (1993) is half of the horizontal load which produces I inch deflection at pile head] of a pile is greater if the . pile is embedded in stiff soil. However the maximummoment corresponding to allowable load increases with the increase of soil modulus. The reason behind this is the increase in allowable horizontal capacity in stiff soil. Higher horizontal load produces higher , maximum moment. To attain higher allowable capacity of a pile embedded in a better soil the reinforcement of the pile should be increased according to the value of maximum moment. The horizontal capacity and corresponding moment of a pile embedded in soft soil and tip resting on a stiff soil is similar to a pile embedded in a uniform soil having properties of the top soft layer.
1 citations
Cites methods from "Foundation analysis and design"
...1 GENERAL A computer programme using fmite difference techniques was developed by Bowles(1977) to determine the deflection, moment and shear of a laterally loaded piles embedded in uniform soil....
[...]