Investigations on the Static Behavior of Self-Compacting Concrete Under-Reamed Piles

Peter, J. Annie; Lakshmanan, N.; Manoharan, P.

doi:10.1061/(asce)0899-1561(2006)18:3(408)

Cited by 32 publications

(8 citation statements)

References 1 publication

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“…Here, the shaft diameter D 2 is 300 mm, which does not exceed the maximum diameter range of the general micropile, and the diameter of shear key D 1 is 500 mm, about 1.7 times larger than the shaft diameter. Previous studies related to under-reamed piles showed a significant increase in bearing capacity when the ratio of the diameter of the pile shaft to the bulb was 1.5 ~ 2.0 (Zhang D r a f t 6 and Yangin 1992; Peter et al 2006). The shape of the waveform can be determined from the length of the shear key (L) and the spacing of the shear key (S).…”

Section: Waveform Micropilementioning

confidence: 99%

Field study on axial bearing capacity and load transfer characteristic of waveform micropile

Jang

Han

2018

Can. Geotech. J.

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The waveform micropile is an advanced construction method that combines the concept of the conventional micropile with the jet grouting method. This new form of micropile was developed to improve shaft resistance, and has enabled a higher bearing capacity and greater cost efficiency. Two field tests were conducted to examine field applicability and to verify the effects of bearing capacity enhancement. In particular, waveform micropile construction using the jet grouting method was performed to evaluate the viability of waveform micropile installation. After testing, the surrounding ground was excavated to check the shape of the waveform micropile. The result showed that waveform micropiles can be installed by adjusting the grouting time and pressure. In the loading tests, the bearing capacity of the waveform micropile increased by 1.4–2.3 times that of the conventional micropile, depending on the shape of the micropile. The load transfer analysis using the strain gauge data showed that the waveform micropile increases the shaft resistance in the soil layer. This not only decreases pile settlement, but also contributes to the increase of overall bearing capacity. The overall results clearly demonstrate that the waveform micropile is an enhanced construction method that can improve bearing capacity.

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Section: Waveform Micropilementioning

confidence: 99%

Field study on axial bearing capacity and load transfer characteristic of waveform micropile

Jang

Han

2018

Can. Geotech. J.

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“…Several studies have been conducted to assess the efficiency of under-reamed piles, particularly with uplift loads [8][9][10][11][12]. Martin and De Stephen [8] reported that for overconsolidated stiff clay, a foundation of under-reamed piles with two bulbs is an acceptable option.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Under-Reamed Piles Subjected to Different Types of Load in Clayey Soil

Alhassani

2021

IJE

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Under-reamed piles with one or more bulbs have been widely used in almost all types of soil to support a range of structures. In some cases, in addition to vertical compressive or uplift loads, piles must withstand a considerable lateral load. A 3-D finite element study using ABAQUS software was conducted to examine the behavior of under-reamed piles in clay soil under pure lateral, pure uplift, and combined uplift and lateral loads. In this study, pile (L/D) ratios of 11.66, 15, 20, and 25 were considered by adjusting the pile length to simulate the behavior of rigid and flexible piles. The piles were modeled as a linear elastic material, and the soil behavior was simulated using the Drucker-Prager constitutive model. The findings show that the lateral resistance of piles with (L/D) ratios of 11.66 and 15 increased slightly when under-reamed piles were used. However, no change in lateral resistance was observed for under-reamed piles with (L/D) ratios of 20 and 25 compared with straight piles. The uplift capacity of under-reamed piles was significantly greater than that of a straight pile. The lateral capacity was marginally influenced by the prior uplift loading, such that it decreased for a rigid under-reamed pile, and increased for a flexible under-reamed pile.

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“…In terms of theoretical research, it mainly focuses on the soil failure theory [13], the design of pier foundation [14], the law of load transfer [15,16], and the formula for calculating ultimate compressive bearing capacity [16][17][18][19]. As for experimental study, it includes the research on end resistance reduction [20], settlement deformation [21,22], working mechanism [23][24][25][26], and bearing capacity formula [25,27,28]. Based on the experimental result and theoretical analysis, the paper provides a basis for the research on the vertical bearing capacity of the precast pier foundation with compound concrete.…”

Section: Introductionmentioning

confidence: 99%

Vertical Bearing Capacity of Precast Pier Foundation Filled with Demolished Concrete Lumps

Lei¹,

Li²,

Tang³

et al. 2021

Advances and Technologies in Building Construction and Structural Analysis

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The application of recycled compound concrete made of demolished concrete lumps (DCLs) and fresh normal concrete in pier foundation can effectively improve the utilization efficiency of construction waste resources. In this study, two prefabricated pier foundations based on recycled compound concrete (dimension of Ø800 × 2500 mm and Ø1000 × 2500 mm) and two cast-in-place pier foundations based on ordinary concrete (dimension of Ø800 × 2500 mm and Ø1000 × 2500 mm) were tested. Special attention was devoted to the load-settlement curve characteristics of the precast pier foundation of compound concrete, the load transfer law of the pier-soil system, the soil pressure distribution at the bottom of the pier, and the failure mode. The results showed that the Q-S curve of precast concrete pier foundation made of recycled compound concrete is slow deformation at loading, which is consistent with that of cast-in-place concrete pier foundation. The load transfer theory of pier-soil system is established, and its accuracy is verified by experimental analysis. The precast foundation of recycled compound concrete is the same as the cast-in-place foundation of ordinary concrete. The failure form of prefabricated pier foundation made of recycled compound concrete was a local shear failure, while the failure form of ordinary concrete cast-in-place pier foundation was piercing-type shear failure. The feasibility of relevant theoretical methods for calculating the vertical ultimate bearing capacity is examined.

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Investigations on the Static Behavior of Self-Compacting Concrete Under-Reamed Piles

Cited by 32 publications

References 1 publication

Field study on axial bearing capacity and load transfer characteristic of waveform micropile

Field study on axial bearing capacity and load transfer characteristic of waveform micropile

Analysis of Under-Reamed Piles Subjected to Different Types of Load in Clayey Soil

Vertical Bearing Capacity of Precast Pier Foundation Filled with Demolished Concrete Lumps

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