Dynamic Response of the Foundations Resting on a Two-layered Soil Underlain by a Rigid Layer

Mandal, A.; Baidya, Dilip Kumar; Roy, Debasis

doi:10.1007/s10706-012-9497-2

Cited by 40 publications

(8 citation statements)

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“…The responses obtained from the block vibration tests were further utilized to evaluate the dynamic properties of soil (γ res , G, and C u ). The magnitude of G varies perceptibly with the intensity of the applied force and the number of loading cycles [5], whereas C u and γ res vary continuously across the soil bed [25]. The magnitudes of γ res , G, and C u were determined using Eqs.…”

Section: Dynamic Properties Of Soilmentioning

confidence: 99%

“…The shape of the foundation influences the dynamic properties of soil, such as approximate maximum dynamic shear strain developed in soil (γ res ), shear modulus (G), and elastic uniform compression coefficient (C u ). The dynamic properties of soil vary significantly over a range of loading intensities in block vibration tests [5]. Hence, it is a gripping task to investigate the influence of footing shape on the system characteristics of machine foundations.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Footing Shape on Dynamic Properties and Vibration Transmission Characteristics of Machine Foundations

Surapreddi

Ghosh

2021

Int. J. of Geosynth. and Ground Eng.

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Due to immense infrastructure development activities, a study on the vibration generated by heavy machinery, construction activities, highway and railway traffic movements has gained importance in recent years. The present study investigates the influence of shape on the system and vibration transmission characteristics of block machine foundations under dynamic loading. A series of block vibration tests were conducted on model foundations laid on the local soil available at IIT Kanpur, India, to evaluate the system characteristics of machine foundations. The vibration transmission characteristics of the foundations were investigated using a 3D finite element (FE) analysis. Three different shapes of foundation (circular, square, and rectangular) were considered for the intended purpose. The effect of the loading intensity on various parameters such as natural frequency, soil stiffness, and damping coefficient was investigated. In addition, the shape effect of foundations on the dynamic shear strain, shear modulus, and the elastic uniform compression coefficient was suitably assessed. The efficiency of a wave barrier in mitigating the machine-induced vibration was investigated. It can be observed that the shape of foundations significantly influences the system characteristics. The circular and square foundations perform better than the rectangular foundation at higher loads. In contrast, the vibration transmission characteristics of block foundations are unaffected by the shape of the foundations. The transmission ratio decreases with an increase in the frequency at the pick-up points located away from the vibration source. It can be noted that the absolute damping varies significantly in the presence of the wave barrier at higher frequencies.

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Section: Dynamic Properties Of Soilmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of Footing Shape on Dynamic Properties and Vibration Transmission Characteristics of Machine Foundations

Surapreddi

Ghosh

2021

Int. J. of Geosynth. and Ground Eng.

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“…Coulier et al (2015) investigated the efficacy of jet grout columns in mitigating the rail induced vibration through the field and numerical investigation. Various studies reported the benefits of changing the soil profile of the foundation bed in reducing the amplitude of machine vibration (Baidya and Rathi, 2004;Baidya et al, 2006;Mandal et al, 2012). In addition, the significant improvement in natural frequency of the foundation bed was observed in the presence of stiff layer nearer to the surface footing.…”

Section: Type Of Vehicle Train Truck Bus Carmentioning

confidence: 99%

Mitigation of Traffic Induced Vibration Using Geocell Inclusions

Hegde

Venkateswarlu

2019

Front. Built Environ.

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This paper describes the potential use of geocell reinforcement in mitigating the traffic induced vibration. The vibration caused by the vehicular movement was simulated over the unreinforced and geocell reinforced sections using a mechanical oscillator. The displacement amplitude and peak particle velocity were measured to understand the vibration mitigation efficacy of geocell. The effect of depth of placement of geocell on the mitigation of vibration parameters was studied. The inclusion of geocell was found effective in reducing the induced vibration based on the experimental results. The vibration mitigation efficacy of geocell was improved significantly at the shallow depth of placement of geocell mattress. The improvement in elasticity of the subgrade was observed maximum when the geocell was placed at a depth of 0.1B from the ground surface. Further, analytical and numerical approaches were used to predict the displacement amplitude vs. frequency response of reinforced soil sections. FLAC3D was used for performing the numerical investigation. The geocell was modeled according to its honeycomb shape to acquire the accurate response of geocell reinforced section. Whereas, mass spring dashpot analogy was followed for the analytical evaluation. In overall, the amplitude response predicted from the numerical and analytical studies were found to be in good agreement with the experimental results.

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“…The soil reaction modeling allows one to determine the dominant frequencies of a local ground site, to estimate the enhancement of seismic oscillations by local soils [With, Bodare, 2007;Hosseini, Pajouh, 2010;Kumar et al, 2020], and to obtain accelerograms and response spectra of soil oscillations on the surface. Information on the probabilistic characteristics of seismic oscillations on the soil surface is required for evaluating the critical dynamic stresses and strains that cause loss of soil DOI: https://doi.org/10.24028/gzh.v43i2.230186 stability and, consequently, the destruction of buildings and structures [Gutowski, Dym, 1976;Takemiya, Yamada, 1981;Mandal et al, 2012] located on such ground.…”

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confidence: 99%

Seismic response of a layered soil deposit with inclusions

Kendzera

Mykulyak

Semenova

et al. 2021

GZh

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It is known that soil massifs can amplify or weaken seismic waves generated by earthquakes. Therefore, the problem of studying the impact of soil deposits on the passage of seismic waves is important in terms of the facilities in operation and the design of new earthquake-resistant objects. Soil deposits, which are allotted for building, are mainly layered. In addition, the materials in these layers are also significantly heterogeneous. To describe the dynamics of inhomogeneous soil massif, the model of an elastic continuum with oscillating non-interacting inclusions is used. Within the framework of this model, the resonant properties of multi-layered soil deposit are analyzed at the conditions of harmonic perturbations applied to the bedrock. On the basis of the solution to the boundary value problem concerning oscillations of the system subjected to the free surface and conjugation conditions on the boundaries between layers, it is derived the transfer function which characterizes the amplification of shear displacements by the layered system. Within the framework of problems on the oscillations of two- and five layered systems, the analytical studies were confirmed by numerical evaluations of transfer functions. In particular, using the built-in functions of the system «Mathematica», it is developed the numerical procedure for evaluating the frequency dependencies of amplification factor for layered Kelvin—Voigt media and media with oscillating inclusions. Moreover, for the two-layered system, it is analyzed the effect on the transfer function for the ratio of layers’ shear moduli and the ratio of the inclusions’ natural frequencies. It is also shown that the maxima in the transfer function correspond to the eigenfrequencies of the boundary value problem.The obtained results and the proposed approach to the study of the response of the layered inhomogeneous medium to vibrational perturbations can serve as a theoretical basis for earthquake-resistant design and construction.

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Dynamic Response of the Foundations Resting on a Two-layered Soil Underlain by a Rigid Layer

Cited by 40 publications

References 13 publications

Impact of Footing Shape on Dynamic Properties and Vibration Transmission Characteristics of Machine Foundations

Impact of Footing Shape on Dynamic Properties and Vibration Transmission Characteristics of Machine Foundations

Mitigation of Traffic Induced Vibration Using Geocell Inclusions

Seismic response of a layered soil deposit with inclusions

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