E-Defense shaking test and pushover analyses for lateral pile behavior in a group considering soil deformation in vicinity of piles

Tamura, Shuji; Ohno, Yui; Shibata, Kazuyuki; Funahara, Hideki; Nagao, Toshiaki; Kawamata, Yuji

doi:10.1016/j.soildyn.2020.106529

Cited by 8 publications

(10 citation statements)

References 20 publications

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“…11 that there is clear soil compression under the expanded body (area 1 ), i.e., that there is significant soil displacement in the compression zone, and the displacement magnitude and density of the soil in the compression zone are much higher compared to other areas. The range of soil compression under the expanded body (area 1 ) is about 0.5 times the diameter of the expanded body. The displacement occurs around the bottom of the expanded body and increases along its length, while in areas distant from the expanded body, there is only minor or negligible soil displacement.…”

Section: Pile-soil Separation Characteristicsmentioning

confidence: 99%

“…Improving our understanding of the entire process of soil deformation around the pile is an important step forward for the field. The problem of the mechanics and deformation characteristics of the soil around the pile has been studied and discussed by many scholars using numerical simulation [1][2][3][4], theoretical model [5,6], and indoor physical test [7][8][9][10][11]. Due to better control of conditions and being more economically viable than in situ tests, physical model studies are being widely used in the study of the interaction between soil and expanded pile.…”

Section: Introductionmentioning

confidence: 99%

“…DIC technology has been widely used in geotechnical engineering due to the advantage of allowing high precision and non-contact full-field strain measurement [18][19][20]. Using the DIC technique, Tovar-Valencia et al [21] determined that an increase in the roughness of the shaft results in an increase in the average unit of shaft resistance and in displacements and strains in The problem of the mechanics and deformation characteristics of the soil around the pile has been studied and discussed by many scholars using numerical simulation [1][2][3][4], theoretical model [5,6], and indoor physical test [7][8][9][10][11]. Due to better control of conditions and being more economically viable than in situ tests, physical model studies are being widely used in the study of the interaction between soil and expanded pile.…”

Section: Introductionmentioning

confidence: 99%

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Study on Soil Displacement Fields around the Expanded Body of Drill-Expanded Concrete Piles Based on DIC Technique

Deng

Niu

et al. 2021

Applied Sciences

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The soil displacement field around a drill-expanded concrete pile is noticeably different from that of an equivalent section pile placed under axial load due to the mutual embedment between the expanded body and the soil. It is important to study the soil displacement field around drill-expanded concrete piles in order to understand the mechanisms of interaction between the pile and the soil. First, the model test of the half-face pile installed in undisturbed soil and the model test of the half-face pile installed in sand were used to study the soil displacement field around the pile. Then, the entire process of the soil displacement field’s formation and development under the load was observed by using digital image correlation (DIC) techniques. Finally, numerical simulation was used to verify the results of the model tests. The results show that the displacement characteristics of the soil around the pile in the undisturbed soil and sand are basically the same. There is a clear soil compression zone under the expanded body, and the magnitude and density of the displaced soil in the compression zone are much higher than in other areas. Both the vertical displacement and the horizontal displacement gradually decrease as the distance from the expanded body and the burial depth increase. The horizontal displacement of the soil under the expanded body follows a trend of first moving toward the pile body and then moving away from it. The results of the numerical simulation are basically consistent with the results of the model test, indicating that the results of the model test are relatively reliable.

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Section: Pile-soil Separation Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study on Soil Displacement Fields around the Expanded Body of Drill-Expanded Concrete Piles Based on DIC Technique

Deng

Niu

et al. 2021

Applied Sciences

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“…It was well known that the method of installation of pile foundations had a great influence on the behavioral characteristics of the piles. Most of the current research on the installation form of pile foundations focused on driven piles and hydrostatic piles, but there was some research on the pile-soil interface characteristics of bored piles under hydrostatic pressure [21][22][23]. Wu et al [24] analyzed the mechanical behaviors and law of the grouting mode transition of the unloading grout sand-concrete interface with different grout conditions.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Load-Settlement Curve Based on Load Transfer at Pile-Soil Interface

Zhang

Shi³

et al. 2022

Applied Sciences

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A field pile loading test was carried out on the Peshawar–Karachi Motorway (PKM) project in Pakistan to show the settling mechanism of bored pile foundation in pulverized soil and the force characteristics of frictional resistance at the pile-soil interface. The changes in pile lateral frictional resistance and pile settlement during the loading-unloading process of test piles were measured and analyzed, as well as the load-settlement distribution characteristics of test piles in different soil layers, the distribution of test pile internal forces, and the changes in pile-soil relative displacement. It was established that there was considerable deterioration of pile lateral frictional resistance and residual deformation of pile tip displacement throughout the test pile load-settlement process, and the association between the pile-soil interface frictional resistance and pile-soil relative displacement was addressed. The results reveal that the frictional resistance at the pile-soil interface is directly connected to the nature of the soil layer, with a positive connection between the natural density, specific gravity, compression deformation, and the plastic index under immediate load, and a negative correlation between the natural moisture content, compression coefficient, and settlement variations after unloading. The load-settlement of the pile rose in a non-linear proportion during the loading-unloading operation, with a maximum settlement value at the pile top of 8.14 mm and a residual deformation at the pile bottom of 1.94 mm. The frictional resistance of the pile perimeter was distributed non-linearly throughout the pile depth, and the frictional resistance of the pile-soil interface was severely deteriorated at an embedded depth of 15 m, with the degradation degree of the silty soil layer being significantly smaller than that of the silty clay soil. The relative pile-soil displacement was positively linked with the lateral frictional resistance of the pile under the same load, and the correlation coefficient in silty soil was much greater than that in sandy soil.

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“…In the research performed in [9], large-scale E-Defense shaking table tests were performed using a 3 × 3 pile group in dry sand layers to clarify the dynamic lateral pile behavior in a group. To evaluate the pile response in a group, a new static pushover analysis of pile groups considering soil deformation in the vicinity of piles was developed.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Strength Reduction Factor on Concrete Moment Frames According to the New Venezuelan Seismic Code

et al. 2022

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Nonlinear static analysis is a validated tool for the seismic evaluation of existing and new structures, specifically for reinforced concrete buildings. In order to assess the performance of reinforced concrete frames designed according to the new Venezuelan seismic code, configurations of low-, medium-, and high-rise concrete buildings are subjected to 20 different load patterns considering the nonlinear behavior according to FEMA P695. A total of 140 concrete frame models were analyzed using modal response spectrum analysis and nonlinear static pushover analysis. The parameters considered for analyzing the models were the response reduction factor (R), the overstrength factor (RΩ), and the ductility factor (Rµ). The results showed a performance controlled by ductile failure mechanisms in low-rise models unlike combined failure mechanisms with columns with plastic hinge in high-rise models. Reduction factor values between 4 and 14 were obtained. In addition, the pushover curves were affected by the load patterns; therefore, it was necessary to identify the representative patterns, refusing the rest of the patterns. A statistical adjustment was performed using a log-normal distribution. The strength reduction factor specified in the new Venezuelan code was higher than the values obtained for the 95% confidence levels according to the distribution assumed in the reinforced concrete frames models. Finally, the strength reduction factor more representative is R = 4.

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E-Defense shaking test and pushover analyses for lateral pile behavior in a group considering soil deformation in vicinity of piles

Cited by 8 publications

References 20 publications

Study on Soil Displacement Fields around the Expanded Body of Drill-Expanded Concrete Piles Based on DIC Technique

Study on Soil Displacement Fields around the Expanded Body of Drill-Expanded Concrete Piles Based on DIC Technique

Analysis of Load-Settlement Curve Based on Load Transfer at Pile-Soil Interface

Assessment of Strength Reduction Factor on Concrete Moment Frames According to the New Venezuelan Seismic Code

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