Numerical analysis of high capacity helical piles subjected to ground movement in weathered unstable clayey slope

Dib, Mehdi; Kouloughli, Salim; Hecini, Mabrouk

doi:10.1016/j.compgeo.2019.01.024

Cited by 8 publications

(3 citation statements)

References 16 publications

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“…The use of berglass in diverse contexts, particularly in Fiber Reinforced Polymer (FRP) for geotechnical applications, has experienced notable growth in recent years, in uenced by various factors. Several numerical and practical studies have been carried out to evaluate the effectiveness of micropiles in improving soil strength in geotechnical applications [1,8,11,36,37,50,52]. Valez examined the performance of carbon ber piles in both stabilized and non-stabilized soft soils, along with berglass piles [14].…”

Section: Introductionmentioning

confidence: 99%

Investigating Load-Settlement Characteristics of Square Model Footings on Sand Beds Enhanced with Textured Vertical Pultruded Fiberglass Reinforced Helical Piles

Zargar,

Shah

2024

Preprint

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This article introduces a novel ground enhancement method utilizing textured vertically oriented fiberglass pultruded pipes. These pipes feature a widened bottom toe in a helical shape. The research primarily explores textured prefabricated helical piles, varying in length and cross-sectional area, designed to act as reinforcing bearing elements in sandy soil. The ongoing study includes performing experimental investigations on a laboratory model square footing positioned on sand, with textured PFRH piles installed beneath it. A parametric investigation was carried out to examine the influence of textured PFRH pile slenderness ratio, different states of sand beds, and varying helical plate diameters through laboratory model plate load tests. The findings indicated that placing textured PFRH piles beneath the footing substantially enhanced the settlement characteristics and load-carrying capacity of the structure. There was a noticeable increase in load-carrying capacity with an increase in the slenderness ratio of textured PFRH piles, although the improvement became insignificant beyond a slenderness ratio of 20. In the absence of reinforcement, denser sand exhibited superior bearing capacity for footings. However, in the case of reinforced footings, textured PFRH piles demonstrated the most substantial improvement in medium-density sand. Furthermore, augmenting the helical plate diameter led to an enhanced load-carrying capacity. The study employed multivariate linear regression to establish a robust correlation between experimental and predicted bearing capacity ratios, affirming the reliability of the findings. In summary, this research underscores the significant potential of utilizing textured prefabricated helical piles in fortifying soil foundations, offering valuable insights for optimizing the design and performance of such systems across diverse soil conditions.

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Section: Introductionmentioning

confidence: 99%

Investigating Load-Settlement Characteristics of Square Model Footings on Sand Beds Enhanced with Textured Vertical Pultruded Fiberglass Reinforced Helical Piles

Zargar,

Shah

2024

Preprint

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“…Various numerical and experimental studies have been conducted to investigate micropiles used for soil reinforcement in geotechnical applications [ 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 ].…”

Section: Introductionmentioning

confidence: 99%

Vertical Fiberglass Micropiles as Soil-Reinforcing Elements

et al. 2022

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This article is dedicated to developing a ground improvement technique using vertically oriented reinforcement elements prefabricated utilizing fiberglass pultruded pipe and helical shape wideners at the bottom toe. Structures of the prefabricated helical micropiles varied by the length and cross-section area introduced into the soil massive as reinforcing bearing elements. The effect of the reinforcements geometry variation was investigated through a reinforcement factor (µ), based on which a calculation method for measuring settlement of reinforced soil has been previously developed Full-scale field plate load tests were performed before and after reinforcing the soil to investigate the changes in the soil stiffness after the reinforcement process. Comparative analysis between the reinforced and reference soft sandy soil indicates an average increase in the deformation properties of the fiber reinforced soils by 8%, 30%, 63% at the applied pressures of 100, 300, and 550 kPa, respectively. The influence of the fiber reinforced polymers (FRP) geometrical properties on the final composite settlement was determined. A comparative analysis of the calculated and the actual plate load tests results reveals that the previously proposed settlement calculation method is adequate for further development.

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“…According to the field investigation, the anti-slide piles arranged in the Quchi landslide have performed some elastic deformation without any cracks under the large sliding force, which indicates that the anti-piles are hard to achieve the plastic failure with a large landslide deformation under the current conditions. Consequently, the complete elastic model is adopted for the two types of anti-slide piles without considering their failure and plastic deformation [5,[22][23]35,43]. Based on laboratory and field measurements and combined with geological survey data, the detailed material properties of numerical simulation are presented in Table 1.…”

mentioning

confidence: 99%

Working performance and mechanism of a novel upper-hollow drainage anti-slide pile under the effect of reservoir water fluctuation and precipitation

Huang

Song

et al. 2023

Acta Geotech.

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Anti-slide piles have been widely applied in many practical projects around the world.In this work, a novel upper-hollow drainage anti-slide pile (UDAP) is selected to evaluate its working performance and mechanism by means of a physical model test and a numerical simulation. The physical model test indicates that UDAPs exhibit an excellent drainage performance, and the earth pressure and the pore water pressure around them dramatically decrease. The catchment holes placed on the lateral and upslope sides of the UDAPs have the same effects, and their drainage capacity improves with depth. The numerical simulation results of the UDAP arranged in the Quchi landslide (China) indicates that the retaining effect of the UDAPs is significantly better than that of the conventional anti-slide piles (CAPs). The landslide thrust and deformation are reduced due to the decrease of groundwater table and the consequent pore water pressure reduction due to the drainage effect of the UDAPs. Furthermore, the deflection and internal force of the UDAPs are significantly lower than those of the CAPs. The retaining effect of the continuous and interval arrangement scheme of the UDAPs is almost identical. Furthermore, the value of the internal force and the law of variation of the UDAPs and CAPs are basically the same. Therefore, the results of this paper can provide an important basis for the future research, design, popularization and application of the UDAPs.

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Numerical analysis of high capacity helical piles subjected to ground movement in weathered unstable clayey slope

Cited by 8 publications

References 16 publications

Investigating Load-Settlement Characteristics of Square Model Footings on Sand Beds Enhanced with Textured Vertical Pultruded Fiberglass Reinforced Helical Piles

Investigating Load-Settlement Characteristics of Square Model Footings on Sand Beds Enhanced with Textured Vertical Pultruded Fiberglass Reinforced Helical Piles

Vertical Fiberglass Micropiles as Soil-Reinforcing Elements

Working performance and mechanism of a novel upper-hollow drainage anti-slide pile under the effect of reservoir water fluctuation and precipitation

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