Analysis of the consolidation of laterally loaded micropiles

Shahrour, Isam; Ata, Ninel

doi:10.1680/grim.2002.6.1.39

Cited by 9 publications

(4 citation statements)

References 3 publications

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“…They examined how the slenderness ratio, spacing-to-diameter ratio, and group arrangement of micropile foundation systems affected the load transfer mechanism and load-bearing capacity [10]. In addition, various micropile loading tests were performed to assess the MPs' lateral performance (e.g., Richards and Rothbauer [12]; Long et al [13]; Shahrour and Ata [14]; and Teerawut [15]). Farghaly and Kontoni [16] investigated the mitigation of the seismic pounding between RC twin high-rise buildings with piled raft foundation considering soil-structure interaction.…”

Section: Introductionmentioning

confidence: 99%

Static analysis of prestressed micropile-raft foundation with varying lengths resting on sandy soil

Jamkhaneh

Kontoni

2023

Innov. Infrastruct. Solut.

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The micropile-raft system is used in the foundation system of buildings due to the combination of the advantages of raft foundations and micropiles. In this paper, the numerical model was calibrated and validated with a field test, and then several parametric studies were performed. The overarching aim of the study is to determine the efficiency of different arrangements of micropiles and the effects of these parameters on the behavior of piled raft foundations in sandy soil. Parameters including diameter, length, and distance of micropiles from each other were considered in the analyses. Prestressed rebars have been used to increase the load-bearing capacity and prevent premature buckling under severe compressive load. Therefore, to compensate for the weak bearing capacity of the raft foundation, a micropile system equipped with prestressed rebars was considered to increase the bearing capacity of the foundation. The results revealed that using a set of micropiles with a diameter of 30 cm and a length of 10 m had the maximum efficiency among other models. Furthermore, an innovative arrangement of micropiles was proposed in which a set of micropiles with a length of 30 m was placed at the middle region of the foundation, and in the peripheral area of the foundation, several short micropiles were used.

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Section: Introductionmentioning

confidence: 99%

Static analysis of prestressed micropile-raft foundation with varying lengths resting on sandy soil

Jamkhaneh

Kontoni

2023

Innov. Infrastruct. Solut.

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“…The conclusion was that the greater the depth of the pile cap from the ground surface, the greater the cap's lateral resistance. To study the influence of excess pore-water pressure build-up on the response of laterally loaded single micropiles, Shahrour and Ata [16] performed a three-dimensional finite element simulation with Biot's theory for the fluid-soil skeleton coupling. Their soil was represented by an elastoplastic constitutive relation with a non-associated Mohr-Coulomb flow rule.…”

Section: Introductionmentioning

confidence: 99%

Responses of Laterally Loaded Single Piles Subjected to Various Loading Rates in a Poroelastic Soil

Gui

Alebachew

2022

Applied Sciences

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Groundwater table has an important role in soil–structure interaction problems. However, analysis of laterally loaded single piles has often been conducted by solely considering the mechanics of the soil skeleton or decoupling the interactive mechanics of the soil skeleton and the fluid flux; in other words, most analyses were performed without taking into consideration the coupling effect between the soil skeleton and the fluid flux. To improve our understanding of the hydromechanical coupling effect on laterally loaded single piles, a series of finite element study on laterally loaded single piles in saturated porous media was conducted. The effect of pile cap geometries, cap widths, cap embedment depths, and pile lengths, on the response of laterally loaded single piles was also studied. The loading condition of the pile was found to have a significant effect on the generation of excess pore-water pressure. The lateral displacement and bending moment computed at the maximum excess pore water pressure, which in turn, is equivalent to an undrained analysis, produced the minimum responses among all the other loading conditions. The effect of pile cap geometries was found to be much less significant than anticipated.

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“…One of the major concern was to evaluate the lateral loads acting on the micropiles, which will provide crucial information for the design in practice. Commonly, the stability of reinforced by micropiles was analyzed through analytical and numerical methods by incorporating the stability of slopes without reinforcement with the resisting force provided by the stabilizing piles (Bransby and Springman, 1999;Mokwa and Duncan, 2001;Shahrour and Ata, 2002;Rollins Kyle et al, 2003;Richards and Rothbauer, 2004;Alnuaim et al, 2015). However, these methods can only provide the ultimate state, without the development of pile resistance with the soil movement.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Micropiles With Different Configuration Settings for Landslide Stabilization Based on Large-Scale Experimental Testing

Yan

Tong

et al. 2021

Front. Earth Sci.

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In this study, a large-scale model test was performed to investigate the effect of the single-row and double-row micropiles on the landside stabilization. For two different testing configuration settings, the bending moment along the micropiles, failure mode, and force condition were captured and compared. It is found that the landslide thrust on piles was distributed in a triangular shape. The piles in the front row carried greater pressure than the piles in the rear row. The resistance of the sliding body behind the pile was distributed in a parabolic shape, and mainly concentrated on the middle of the pile. The piles were destroyed due to the combined shearing and bending impact applied near the slipping surface. The boundary of the failure zone was from the position of two times the pile diameter under the slipping surface to the position of two and a half times the pile diameter above the slipping surface. Under the action of the landslide, each row of piles deformed at the same time. The capability of landslide stabilization for double-row piles was better than that of a single-row pile. The sections of the pile above slide surface were mainly subjected to negative bending moments and were distributed mainly within the pile length range of one-third of the anti-sliding section above the sliding surface. The pile body of the embedded section located in the range of ten times the pile diameter below the sliding surface was subjected to a positive bending moment.

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Analysis of the consolidation of laterally loaded micropiles

Cited by 9 publications

References 3 publications

Static analysis of prestressed micropile-raft foundation with varying lengths resting on sandy soil

Static analysis of prestressed micropile-raft foundation with varying lengths resting on sandy soil

Responses of Laterally Loaded Single Piles Subjected to Various Loading Rates in a Poroelastic Soil

Evaluation of Micropiles With Different Configuration Settings for Landslide Stabilization Based on Large-Scale Experimental Testing

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