scholarly journals Analysis of some key aspects of soil/foundation interaction-Finite elements modelling

2018 ◽  
Vol 149 ◽  
pp. 02019
Author(s):  
Hamidi Ahmed ◽  
Bouafia Ali
Keyword(s):  
Finite Elements ◽  
Threshold Value ◽  
Shallow Foundation ◽  
Threshold Distance ◽  
Saturated Clay ◽  
Foundation Base ◽  
Soil Foundation ◽  
Finite Elements Modelling ◽  
Key Aspects ◽  
Strip Footings

This paper is aimed to contribute to the analysis of three important aspects of soil-foundation interaction, which are not clearly investigated, by means of a detailed parametric study based on a finite elements modelling. The first aspect focuses on the effect of the bedrock proximity on the load-settlement behaviour of a continuous or circular shallow foundation. It was found there exists a threshold distance between the foundation base and the top of the bedrock layer beyond which the foundation behaves as in an infinitely deep medium. The second one deals with the behaviour of shallow foundation on a bi-layered soil where the effect of the underlying layer on the bearing capacity as well as on the settlements depends on the distance between the foundation base and the top of the underlying layer, and beyond a threshold value this effect vanishes. The third aspect studied was the interference between two strip footings installed on saturated clay. It was shown within a threshold distance between these foundations, an important modification of the foundation behaviour may occur. Finally, the numerical results were fitted and interpreted which allowed suggesting simple practical formulae for shallow foundations design.

Finite Elements Modelling of Elastoplastic Structures Using Self-Consistent Constitutive Relation

1991 ◽  
pp. 659-662
Author(s):  
E. Scacciatella ◽  
J. M. Genevaux ◽  
P. Lipinski ◽  
M. Berveiller ◽  
J. M. Detraux ◽  
...  
Keyword(s):  
Finite Elements ◽  
Constitutive Relation ◽  
Self Consistent ◽  
Finite Elements Modelling

scholarly journals An Experimental Study on the Ecological Support Model of Dentate Row Piles

2020 ◽  
Vol 2020 ◽  
pp. 1-12 ◽  
Author(s):  
Yousheng Deng ◽  
Zhihe Cheng ◽  
Mengzhen Cai ◽  
Yani Sun ◽  
Chengpu Peng
Keyword(s):  
Building Materials ◽  
Soft Soil ◽  
Earth Pressure ◽  
Shallow Foundation ◽  
Laboratory Model ◽  
Foundation Pit ◽  
Maximum Displacement ◽  
Single Row ◽  
The Earth ◽  
Soil Foundation

Bamboo is highly renewable and biodegradable with good short-term strength, which meets the requirement for temporal support structures in shallow foundation pits. Based on this, we conducted a laboratory model test on the dentate bamboo micropile support structure combined with environmentally friendly building materials and new type of piles, to explore the stress characteristics, stress change regularity, and the support effect of the system in soft soil foundation pits. The results show that the earth pressure on the pile sides above the excavation surface gradually decreases with an increase in the excavation depth. The bending deformation of the bamboo pile was also significant. The results also show that the earth pressure and the pile strain below the excavation surface change slightly during the excavation process. When the short sides of the foundation pit were loaded, the highest strain was recorded in the piles 4 and 11. A maximum strain of 358.93 με was recorded, and the maximum displacement of the pile in the top part was obtained to be only 2.14 mm. The most subsidence of dentate pile obtained is only 1.88 mm, whereas that of the single-row pile is 2.35 mm. Compared to the traditional single-row pile, the dentate piles can effectively reduce the horizontal deformation as well as the surface subsidence effectively. They can also support more external lateral load, and hence maintain the foundation stability and give better support. The results provide a theoretical basis for ecological bamboo support technology and have great value to be promoted.

Beam-on-Nonlinear-Winkler-Foundation Modeling of Shallow, Rocking-Dominated Footings

2009 ◽  
Vol 25 (2) ◽  
pp. 277-300 ◽  
Author(s):  
Chad W. Harden ◽  
Tara C. Hutchinson
Keyword(s):  
Earthquake Engineering ◽  
Energy Content ◽  
Nonlinear Behavior ◽  
Seismic Energy ◽  
Shallow Foundation ◽  
Winkler Foundation ◽  
Soil Foundation ◽  
Performance Based Earthquake Engineering ◽  
Foundation Structure ◽  
Selection Of

The nonlinear behavior of shallow foundations under large amplitude earthquake-induced loading can result in dissipation of seismic energy through the mechanism of soil yielding beneath the foundation. In addition, foundation uplifting may shift the period of the soil-foundation-structure system away from the damaging energy content of most earthquakes. However, this yielding and uplifting may lead to excessive transient and permanent deformations (settlement, rocking, and sliding). Therefore, modeling procedures that account for foundation nonlinearity and uplift are needed before these benefits can be realized in performance based earthquake engineering (PBEE) practice. This paper adopts a beam-on-nonlinear-Winkler-foundation (BNWF) simulation methodology for modeling shallow foundation-structure systems, where seismically-induced rocking plays a predominant role in their response. Numerical results demonstrate that reasonable comparison between the nonlinear Winkler-based approach, and experimental response in terms of moment-rotation, settlement-rotation, and shear-sliding displacement can be obtained, given an appropriate selection of model and soil properties.

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