A Method for Reinforcing the Ground Adjacent to the Footing Using Micropiles

Lee, Tae-Hyung; Chul, Im Jong; Kim, Changyoung

doi:10.1080/1064119x.2014.974787

Cited by 9 publications

(3 citation statements)

References 5 publications

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“…The results indicate that the use of longer piles (or higher value of L/H) yielded higher value of BCR, however, after the L/H reached values of larger than 2.5, the improvement was found not to be significant. This is because the longer piles generate a more horizontal restrain effects comparing to shorter ones (Hwang et al, 2017;Lee et al, 2016). It is noted that once the pile reaches maximum value of its length, the increase in length will not contribute much on the bearing capacity of the foundation.…”

Section: Influence Of Micropile Lengthmentioning

confidence: 99%

Enhancing the performance of boundary footing of a renovated building using micropiles: Numerical and Site Visual Assessment

Bui

Nguyen²,

Pham

et al. 2022

JMES

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Reconstruction and building extensions have become popular trends, even being recognized as one of the most appropriate options for homes, especially in high population density areas or crowded cities. Due to the changes in the size of buildings (by applying additional loads), the existing foundations themselves are incapable of resisting extra stresses. Therefore, it is imperative to increase the bearing capacity as well as the overall stability of existing foundations. The paper aims to present a numerical case study on the use of micropile elements for enhancing the performance of the boundary footing of a renovated building in terms of bearing capacity and stability. Moreover, the effect of cohesionless soil types on the bearing capacity of boundary foundations was presented. Numerically calculated results show that the stability of the boundary footing, presented in terms of the safety factor, was increased as strengthened by micropiles. The bearing capacity ratio (BCR) of the boundary footing was significantly improved when the relative distance (S) between the micropile and the boundary footing decreased, and the length of micropiles (L) increased; however, the BCR rose as the micropile’s angle (() with respect to the vertical increase. In other words, the performance of the foundation underneath the boundary footing was significantly affected by some micropile parameters, including length, inclination, and the distance between the micropile and the boundary footing. These crucial factors must be carefully examined during the design of the micropiles’ configuration for strengthening the boundary footing. Lastly, the load-carrying capacity improvement of the loose sand using micropiles was found to be more significant than that of denser ones.

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Section: Influence Of Micropile Lengthmentioning

confidence: 99%

Enhancing the performance of boundary footing of a renovated building using micropiles: Numerical and Site Visual Assessment

Bui

Nguyen²,

Pham

et al. 2022

JMES

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“…The paper of Su Juan Zhang [5] mainly introduced the construction technology and its main connections with superstructure in building heightening and transformation. Tae-Hyung Lee et al [6] recommended the most effective model and design method to improve the reinforcement efficiency of micropiles by experimental results. The study of Tian-fei Hu et al [7] proposed an anchored micropile structure consisting of a conventional micropile structure (CMS) and anchor ties.…”

Section: Introductionmentioning

confidence: 99%

Study on the Interaction Mechanism between Micropiles and Soil Landslides

Sui

Wang

et al. 2023

Sustainability

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The interaction mechanism between micropiles and soil landslides is comprehensively investigated through static model tests and numerical simulations. The results show that the deformation damage mode of micropiles is mainly bending and shear damage. Because of bending deformation, cracks appear at the rear and front of the pile, respectively, about three times the pile diameter from the sliding surface. In addition, the plastic damage becomes more severe when approaching the back edge of the landslide body. Micropiles in the landslide body play a significant role in load sharing; more importantly, there is a certain pattern between the miniature piles. According to the experimental and numerical simulation results, the recommended load-sharing ratio for micropile design under static conditions is as follows: rear-row pile:middle-row pile:front-row pile = 0.411:0.348:0.241. The research in this paper reveals the good effect of micropiles against landslides, explains the mechanism of pile–soil interaction, and provides a theoretical reference for the research and application of micropiles in engineering.

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“…Compared with conventional pile, micro-pile has smaller diameter that generally refers to pile diameter less than 300 mm, and it has advantages such as relatively low vibration and noise, fast construction speed, less cost, as well as a flexible pile arrangement during construction process. Furthermore, it can also be constructed in limited construction sites when large machines are not applicable [16,17]. However, its application in red-bedded soft rock foundation reinforcement has rarely been reported, and its feasibility needs to be further studied.…”

Section: Introductionmentioning

confidence: 99%

Study on Anti-Uplift Effect of Micro-Steel-Pipe Pile on Red-Bedded Soft Rock Subgrade

et al. 2022

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To investigate the treatment effect of micro-piles on uplift deformation of red-bedded soft rock subgrade, an in-situ static load test of slurry injected steel pipe micro-piles with different length was carried out, the uplift bearing capacity and deformation characteristics of micro-piles were analyzed, and the load transfer function of pile lateral friction resistance was modified with the consideration of pile length. A numerical simulation method considering the variable shear stiffness at the pile-soil interface was established, and the inversion of the relevant material parameters was carried out based on the in-situ test results. Through numerical simulation, the effect of single piles with different pile lengths and group piles with different pile spacing on the treatment of the uplift deformation of the subgrade was investigated. Finally, the anti-uplift design method of micro-piles in red-bedded soft rock was proposed. The results show that the uplift bearing capacity increased nonlinearly with the increase in pile length, and the variation curve of pile lateral friction resistance with pile-soil relative displacement showed a hardened type. The predicted pile lateral friction resistance shows a good correlation with the measured result; all the correlation coefficients were greater than 0.81. The uplift deformation of subgrade without piles was radially distributed with the maximum value of 5.12 mm as the center. A single micro-pile with a length of 7 m or a rectangular array of group piles with a length of 7 m and a spacing of 3D could effectively decrease the maximum uplift deformation to less than 4.0 mm, which can meet the requirement of specification. Thus, the micro-piles could be used for controlling the uplift deformation of red-bedded soft rock subgrade, and this study can provide a reference for anti-uplift design in the distributed area of red-bedded soft rock.

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A Method for Reinforcing the Ground Adjacent to the Footing Using Micropiles

Cited by 9 publications

References 5 publications

Enhancing the performance of boundary footing of a renovated building using micropiles: Numerical and Site Visual Assessment

Enhancing the performance of boundary footing of a renovated building using micropiles: Numerical and Site Visual Assessment

Study on the Interaction Mechanism between Micropiles and Soil Landslides

Study on Anti-Uplift Effect of Micro-Steel-Pipe Pile on Red-Bedded Soft Rock Subgrade

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