Effect of grid-form deep soil mixing on the liquefaction-induced foundation settlement, using numerical approach

Rahmani, Fereshteh; Hosseini, Seyed Mahdi; Khezri, Ali; Maleki, Mahdi Rasouli

doi:10.1007/s12517-022-10340-x

Cited by 33 publications

(9 citation statements)

References 23 publications

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“…The lateral boundary of the model should be sufficiently far from the model's lower limit to minimize the impact of boundaries on the numerical results. The displacement and stress contours in the finite element software confirm that the accepted distance is enough [40,41]. The finite element meshes are built much finer (cross-shaped) near the pile, as seen in Figure 1.…”

Section: Constitutive Soil Modelingmentioning

confidence: 61%

“…The mesh size was established by considering the wavelength of input motion and the highest frequency at which there was negligible spectral content. In addition, the meshing refinement should be stopped after checking that the results do not change [41]. Therefore, mesh refinement was conducted until it was confirmed that the results remained consistent.…”

Section: Constitutive Soil Modelingmentioning

confidence: 99%

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Numerical Validation of Fully Coupled Nonlinear Seismic Soil–Pile–Structure Interaction

Çetindemir,

Zülfikar

2024

Buildings

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While many researchers have broadly studied soil–structure interaction (SSI) problems to comprehend SSI effects on the overall system’s behavior, some critical numerical modeling issues have not been sufficiently investigated to achieve the most accurate results. Furthermore, most scholars have not provided detailed explanations of the validation process for their proposed numerical models. Modeling pile foundations in a three-dimensional (3D) continuum system in a fully coupled manner is often challenging for engineers who do not specialize in structural and geotechnical earthquake engineering, as it can be very time-consuming and complicated. Therefore, this work aims to validate a finite element model of seismic soil–pile–structure interaction (SPSI) problems in a continuum soil body by comparing the results of numerical models with those of a centrifuge test and computed numerical simulations available in the literature. In this regard, several newly developed elements in OpenSees (Version 3.6.0) are tested. The results of this work demonstrate a closer alignment with prior experimental research findings. It is believed that providing detailed numerical modeling and validation processes will assist researchers in better understanding crucial issues in modeling soil–pile–structure interaction problems.

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Section: Constitutive Soil Modelingmentioning

confidence: 61%

Section: Constitutive Soil Modelingmentioning

confidence: 99%

Numerical Validation of Fully Coupled Nonlinear Seismic Soil–Pile–Structure Interaction

Çetindemir,

Zülfikar

2024

Buildings

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“…The created soil profiles were analyzed for 10 different strong ground motion records. In addition, the points highlighted in the literature were taken into consideration in determining the soil geometry, finite element mesh and boundary conditions, which are of great importance for numerical analysis 94 – 96 .…”

Section: Numerical Analysismentioning

confidence: 99%

The effect of RCA pavements on the liquefaction-induced settlement

Akbaş¹,

Subasi²,

İyisan³

2023

Sci Rep

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The use of recycled concrete aggregates (RCA) not only reduces the demand for natural aggregates (NA) but also might improve the behavior of soil under earthquake loading. In this study, the behavior of the pavement constructed using 100% RCA and NA on a sandy soil layer with high liquefaction potential under dynamic loads was investigated by numerical analysis and compared with free field conditions. For this purpose, first, the classical geotechnical properties of 100% RCA and NA materials were obtained, and then the stiffness properties were determined by resilient modulus and permanent deformation tests. In the second stage, three different models were created with pavement with NA and RCA and without pavement on high liquefaction potential sand, and dynamic analyses were carried out by PM4Sand. Numerical analyses show that constructing a subbase and base layers significantly reduces liquefaction-induced settlement on the surface of flexible pavements built on liquefied soils. Moreover, when the case of using RCA instead of NA in the subbase and base layers built on the liquefied soil is examined, the liquefaction-induced settlement values on the surface are obtained either lower or very close. Consequently, this study proposes a new alternative to the use of RCA waste materials instead of NA. It is expected the use of these waste materials will reduce the need for storage space and also reduce the negative environmental effects associated with storage.

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“…(4) The vertical relative displacement between the pile and soil is small. (5) The lateral deformation of the soil is not considered.…”

Section: Basic Assumptionsmentioning

confidence: 99%

“…They conducted relevant numerical simulation research on pile-soil interaction and obtained the sensitivity calculation formula of different soil parameters to the displacement of liquefiable sand. Rahmani et al [5] used a numerical model, developed in the GiD + OpenSees interface V2.6.0, to investigate the effect of DSM improvement with a grid pattern on foundation settlement and EPWP generation. The results also indicated that the grid wall spacing, diameter of the columns, soil relative density, and shear modulus ratio between the DSM columns and the enclosed soil play a vital role in liquefaction occurrence and volumetric strains.…”

Section: Introductionmentioning

confidence: 99%

Study on Vertical Load Distribution of Pile Group–Liquefied Soil System under Horizontal Seismic Environment

Huang

Bai

et al. 2023

Sustainability

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The dynamic responses of pile–liquefied composite soils are complex, and the bearing capacities of single piles or pile groups in liquefiable soils remain unclear. For friction piles, the friction resistance determines the vertical bearing capacity of the pile. In a pile–soil system, it is very important to study the friction resistance changes in the pile during vibration. Based on a shaking table test, this study investigated the vertical bearing capacity of a pile foundation–liquefied soil system under simulated horizontal seismic forces, using the MIDAS GTS software. The load borne by the top of the pile was studied under a horizontal earthquake with a certain vertical load, different pile spacings, and different vibration times, along with the cumulative coefficient CCPF of the pile side friction. The distributions of the CCPF along the pile body of a single pile and pile groups with different pile spacings were analyzed at different vibration times. It was found that the CCPF intuitively reflected the distribution law of the pile side friction during vibration. When the CCPF at the bottom of the pile was equal to 1, the load on the top of the pile was equal to the average value of the total load. When the CCPF at the bottom of the pile was less than 1, the load on the top of the pile was less than the average value of the total load. When the CCPF at the bottom of the pile was greater than 1, the load on the top of the pile was greater than the average of the total load.

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Effect of grid-form deep soil mixing on the liquefaction-induced foundation settlement, using numerical approach

Cited by 33 publications

References 23 publications

Numerical Validation of Fully Coupled Nonlinear Seismic Soil–Pile–Structure Interaction

Numerical Validation of Fully Coupled Nonlinear Seismic Soil–Pile–Structure Interaction

The effect of RCA pavements on the liquefaction-induced settlement

Study on Vertical Load Distribution of Pile Group–Liquefied Soil System under Horizontal Seismic Environment

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