Micropile technique to control upward movement of lightweight structures over expansive soils

Nusier, Osama K.; Alawneh, Ahmed Shlash

doi:10.1023/b:gege.0000013999.42592.56

Cited by 17 publications

(8 citation statements)

References 8 publications

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“…This result is consistent with the proposed method by Nusier and Alawneh. 2 The maximum measured percentage reduction in heave in this study was 87 . 2%.…”

Section: Effect Of Surface Roughnessmentioning

confidence: 56%

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Small-scale micropiles to control heave on expansive clays

Nusier¹,

Alawneh²,

Abdullatit³

2009

Proceedings of the Institution of Civil Engineers - Ground Impr

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The main purpose of this study was to examine the effectiveness of using micropiles as a technique to control upward movement of lightweight structures over expansive soils. For this purpose, smooth and roughened steel laboratory small-scale micropiles surrounded by dense sand were inserted in predrilled holes of larger diameter made in highly expansive clay. The expansive clay was compacted in a steel box (50 cm 3 50 cm 3 35 cm) to a final height of 20 cm. Steel plates (25 cm 3 25 cm 3 1 cm) were used to model footings.The heads of the model micropiles were fastened to the steel plate. Footings with zero, one, two or four micropiles were prepared then the compacted clay in the laboratory box was flooded with water then upward movement of the model footings due to compacted clay swelling was monitored with time.

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“…This result is consistent with the proposed method by Nusier and Alawneh. 2 The maximum measured percentage reduction in heave in this study was 87 . 2%.…”

Section: Effect Of Surface Roughnessmentioning

confidence: 56%

“…2 For this purpose, the percentage reduction in heave for each test conducted in this study was calculated using equations (1) to (6) and the results are summarised in Table 4. A plot of measured against predicted percentage in heave is shown in Figure 11.…”

Section: Comparison Of Measured and Predicted Rh (%)mentioning

confidence: 99%

Small-scale micropiles to control heave on expansive clays

Nusier¹,

Alawneh²,

Abdullatit³

2009

Proceedings of the Institution of Civil Engineers - Ground Impr

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“…The column acts as a floating-pile in which the soil-column interaction is only mechanically improved, but the heave remains during swelling (Muntohar, 2014, Diana et al, 2016. Upon clay wetting, vertical-swelling pressure was developed that had a tendency to push the foundation upward and therefore, retracted the micropiles from the surrounding sand (Nusier and Alawneh, 2004). Soundara and Robinson (2017) noted that the uplift pressure, due to the swelling pressure, was restrained by the interface of shear stress along the column of the micropile.…”

Section: Elapsed Time (Minutes)mentioning

confidence: 99%

The Behavior of the Flexible Plate – Supported with SiCC-Mortar Column on Expansive Soil

Muntohar¹,

Diana²,

Tafalas³

et al. 2020

IJTech

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This paper provides the test results of the load-deformation test on a flexible plate, supported and unsupported by SiCC mortar columns in the laboratory setting. Two columns types were used in this experiment, a circular column (O-shape) and a column with head enlargement (Tshape). The main purpose of this study was to examine the heave of flexible plate due to the swelling effect and modulus of subgrade reaction under a loading-unloading cycle. The expansive soil was put into a testing container with a diameter and height of 550 mm and 1000 mm respectively. The clay thickness was 700 mm and the sand layer was compacted to 200 mm at the bottom of the container. The column diameter (Dc) was 50.8 mm (2 in.), and had a length of 500 mm. The height and diameter of the column head were enlarged to three times the column diameter (3Dc), which was about 152.4 mm (6 in.). Loading tests were performed after 8 days of saturation and 14 days of curing the column. The test results showed that installation of the column in support of the plate reduced the heave to about 16% and 22% respectively for the O-shape and T-shape column-support plates. The T-shape column-strengthened plate can enhance the modulus of subgrade reaction to about 203%. This result indicated significant improvement by the enlarged column head in carrying and transmitting the load to the soil.

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“…These include removing and replacing the expansive material [1], physical and chemical stabilization [2], drainage management such as vertical and horizontal barrier, and use of special foundation techniques [3]. Among several proposed methods to reduce the damage caused by expansive soil, vertical reinforcement such as pile [4], micro pile [5], granular pile anchor (GPA) [6], Geo-pile [7], cement columns [8] and lime columns [9], are structures that used to counteract the upward force caused on the foundation by the swelling soils. However, most of them are found to have a certain limitation in terms of technicality, effectiveness and may be very costly [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Pile Connections on the Performance of the Nailed Slab System on the Expansive Soil

Diana¹

2017

GEOMATE

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Expansive soils are clay that swells and shrinks with changing moisture content. The pavement that constructed on these soils is subjected to large uplifting forces caused by swelling. Hence, there is an imperative need to counteract the problem posed by these soils by devising innovative pavement technique. An attempt to develop a simple, easy to install and cost-effective alternative pavement system, nailed slab system was developed, wherein slab pavement will be connected to a reinforced concrete mini piles.This research examines the emerging role of mini piles in the context of reducing soil uplift movement and the nailed slab system (pile supporting slab pavement) a system for minimizing slab movement due to swelling in expansive soil by conducting small-scale experimental modeling in laboratories. The heave prediction also doing by using the correlation between change in moisture content and vertical strain from oedometer test data. The results of this study indicate that reinforcing the soil by using the mini piles can reduce heave of soil, and the nailed slab system experiencing smaller upward movement than an unsupported slab. The connection between the pile and the slab has a significant effect on the system's ability to withstand the upward movement of expansive soil. When pile and the slab were monolithically connected, the system shows the better performance than those the slabs with the free head pile. Thereafter a heave prediction analysis provided the amount of heave that slightly overestimates, but still good enough for a rough estimation.

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Micropile technique to control upward movement of lightweight structures over expansive soils

Cited by 17 publications

References 8 publications

Small-scale micropiles to control heave on expansive clays

Small-scale micropiles to control heave on expansive clays

The Behavior of the Flexible Plate – Supported with SiCC-Mortar Column on Expansive Soil

Effect of Pile Connections on the Performance of the Nailed Slab System on the Expansive Soil

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