Experimental and numerical modeling of machine foundations on a saturated soil

Al-Wakel, Saad Faik Abbas; Fattah, Mohammed Y.; Karim, Hussein H.; Chan, Andrew

doi:10.1201/b17017-192

Cited by 4 publications

(5 citation statements)

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“…Additionally, some SDOF systems are self-propelled, hence known as SDOFO. [41] presented an SDOFO for vertical translation vibration mode. As an improvement, the authors developed an SDOFO for the rocking vibration mode in this work.…”

Section: Discussionmentioning

confidence: 99%

“…Previous research used multiple displacement measurement systems for the SDOF models, as follows: miniature uniaxial accelerometers [9], potentiometers [10,12], vibration meters [41], wire and laser transducers [11], particle image velocimetry-PIV [17], high-speed cameras [8], and image processing [10]. The authors of this work developed a procedure to measure displacements based on computer vision algorithms, following the trend shown in the latest research.…”

Section: Discussionmentioning

confidence: 99%

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Physical Model of Shallow Foundation under Dynamic Loads on Sands

et al. 2022

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Structures built on sands worldwide, with shallow foundations, have experienced damage and collapse during and after earthquakes. Two phenomena triggered the collapse: the liquefaction phenomenon and the P-Δ effects. However, current research and practice do not fully understand granular soil behavior during liquefaction and P-Δ effects, as proven by the sum of investigations on physical models, constitutive models, and laboratory testing proposals about these topics. A question appears at this point: what is the relationship between excitation frequency, displacement amplitude, and the triggering of overturning? To cope with this issue, the authors propose to create a physical 1-g model composed of a single-degree-of-freedom oscillator (SDOFO) capable of transmitting cyclic loadings to the soil in rocking vibration mode. The measurement methodology was based on computer vision using OpenCV by Python, which allowed the “free movement” of the SDOFO. The authors use computer vision as a suitable way to obtain displacements and times without sensors placed directly in the physical model. According to the results, it was possible to define an inversely non-linear relationship between frequency, displacement amplitude, and the total cycles required to reach overturning for different effective grain-size (D10).

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Physical Model of Shallow Foundation under Dynamic Loads on Sands

et al. 2022

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“…Increase of foundation stiffness has a similar effect on the dynamic response of embedded foundations to that of surface foundations. As for surface foundations, comparisons between Figures (1) and (2) show that the relative stiffness plays a greater role on modifying the response of embedded rather than surface foundations. The effects of foundation mass on the response of surface foundations were also investigated.…”

Section: Previous Studies Related To Dynamic Response Of Foundationmentioning

confidence: 97%

“…The frequency ratio ( ) should be either less than 0.5 or more than 2 to avoid resonance (Rao, 2011). The values of the natural frequency ( ) and frequency ratio ( ) are summarized in Table (2).…”

Section: Resonant Frequencymentioning

confidence: 99%

Numerical Analysis of Machine Foundation Resting Saturated Sandy Soil

Fattah¹,

Salim²,

Al-Shammary³

2014

ETJ

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The behavior of machine foundation on saturated porous medium can be considered as a complicated geotechnical problem due to nature of dynamic loads and plasticity of soil which make the analysis and design of foundation subjected to dynamic loads more complex. The main criteria for safe performance of machine foundations subjected to dynamic loads are to control excessive displacements. In this paper, a dynamic analysis of strip machine foundation with multiple thicknesses is placed at the middle of the top surface of saturated sand with different states (i.e. loose, medium and dense), and vertical harmonic excitation is carried out and building up of the excess pore water pressure. The dynamic analysis is performed numerically by using finite element software, PLAXIS 2D. The soil is assumed as elastic perfectly plastic material obeys Mohr-Coulomb yield criterion. A parametric study is carried out to evaluate the dependency of machine foundation on various parameters including the amplitude and the frequency of the dynamic load. The dynamic response (displacement and excess pore water pressure) generally increases with increasing of loading amplitude, but the displacement and excess pore water pressure versus frequency are not smooth and exhibit undulations (peaks and troughs).

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“…Experimental studies on the dynamic behaviour of surface and embedded foundations have been reported by many investigators [1][2][3][4][5][6][7][8][9] and many others studied the vertical mode of vibration of surface footings, while [10][11] and others studied the vertical mode of vibration of embedded foundations. Some experimental studies have also been conducted on tensional and sliding modes of vibration [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Effect of soil stabilized by cement on dynamic response of machine foundations

Al-Wakel

Abdulrasool

2018

MATEC Web Conf.

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Machine foundations require significant attention from designers. The main goal of the design of machine foundation is to limit the amplitude displacement and not disturb the people who work near the machine. In some cases, if the design of machine foundations does not satisfy the acceptable value of the dynamic response (such as maximum amplitude of displacement), the stabilization of soil under the machine foundation may be used to decrease the amplitude of displacement. This paper outlines effect of stabilized soil under the foundation by cement on the displacement response of machine foundations. Three-dimensional analyses by using finite element method are carried out to investigate the effect of depth of stabilized layer with different percentage of cement content on the dynamic response of the machine foundation. In addition, the effect of area stabilized by cement material on the dynamic response of machine foundation is investigated. The results shown that, the dynamic response of machine foundations generally decreases with increasing the depth of soil layer stabilized with cement. A significant decrease in the displacement of machine foundations is occurred for the stabilized soil layer with a depth of two times of the width of foundation, and the optimum percentage of cement for stabilizing is 6%.

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Experimental and numerical modeling of machine foundations on a saturated soil

Cited by 4 publications

References 1 publication

Physical Model of Shallow Foundation under Dynamic Loads on Sands

Physical Model of Shallow Foundation under Dynamic Loads on Sands

Numerical Analysis of Machine Foundation Resting Saturated Sandy Soil

Effect of soil stabilized by cement on dynamic response of machine foundations

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