Geotechnical Behavior of Helical Piles Via Physical Modeling by Frustum Confining Vessel (FCV)

Khazaei, Javad; Eslami, Abolfazl

doi:10.18488/journal.10/2016.5.9/10.9.167.181

Cited by 16 publications

(8 citation statements)

References 12 publications

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“…The increase in compression forces are (41,40,38,25) times when ratio of Ls/H change from (o) to (0.33) for ordinary piles, single helix, double helix(S/Dh=1) and double helix (S/Dh=1.6) respectively. In other words, for all piles, the compression capacity of screw pile is strongly affected by the number of helix plate, and that's agree with Khazaei, Javad, and Abolfazl Eslami (2016) [14] who conclude that adding helix diameter will be very effective in improving the screw pile capacity.…”

Section: Resultssupporting

confidence: 82%

“…Failure due to axial loading of the screw piles can occur either in individual plate bearing or cylindrical shear model. The type of failure can therefore affect the behavior of the piles and their capacity [14]. Screw piles have become the focus of experimental studies in Geotechnical laboratories are studying the resistance to compressive or pull-out forces and the behavior of these piles under axial loads from the structure itself.…”

Section: Introductionmentioning

confidence: 99%

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Performance Assessment of Screw Piles Embedded in Soft Clay

Ali

Abbas

2019

Civ Eng J

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Screw piles are widely used in a variety engineering applications supplying stability against compression, overturning moment, uplift tension, and horizontal loads. Screw pile is a famous solution for support light structures, roads and rail signs which have relatively low-capacity foundation. In this study, the behavior of circular (10) mm solid screw pile models embedded in a bed of soft clay soil covering a layer of sandy soil has been studied. The 200 mm thick sand layer was compacted in a steel container with a diameter of 300 mm into four sublayers. The sandy soil layer was compacted at a relative density of 70%. The 300 mm thick soft clay soil bed with Cu (30) kPa was compacted in six sub-layers on the sandy bottom layer. Model tests are carried out with screw piles with a length of 300 mm, 350 mm and 400 mm and a helix diameter of 30 mm. Also, single and double helix and different S/Dh ratio were used for these piles and a comparative study between screw piles and ordinary piles (without helices) is accomplished. This study revealed that introducing screw pile of double helix increases its bearing capacity in soft clay soil by up to a (4-8) % as compared to a single helix screw pile. The results showed that the behavior of screw pile essentially depends on the geometric properties of the pile. According to the achievements, compressive load capacity of screw piles depends on embedded length, spacing ratio (S/Dh) and number of helical plates.

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Section: Resultssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Performance Assessment of Screw Piles Embedded in Soft Clay

Ali

Abbas

2019

Civ Eng J

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“…Esmailzade et al (2018) investigated the scale effect on records of

q_{normalc}

and

f_{normals}

from CPT with a cone diameter of 35.7 mm and MiniCone with a cone diameter of 15.9 mm. The tests were carried out on Babolsar sand to investigate boundary conditions of 1 g and FCV‐AUT.…”

Section: Minicone and Cpt Records: Correlations And Comparisonsmentioning

confidence: 99%

“…Records of

q_{normalc}

and

f_{normals}

for CPT and MiniCone with different densities in a 1 g chamber: (a) q c and (b) f s (Esmailzade et al, 2018). …”

Section: Minicone and Cpt Records: Correlations And Comparisonsmentioning

confidence: 99%

Dominant factors in MiniCone, CPT and pile correlations: A data‐based approach

Shirani,

Eslami,

Ebrahimipour

et al. 2023

Deep Underground Science and Engineering

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The cone penetration test (CPT) contributes to the design and analysis of piles regarding geometry, installation effect, and pile capacity (shaft and toe resistance). MiniCone, as an alternative to CPT sounding, has been used to carry out field and laboratory investigations by physical modeling. More tests can be practically carried out through light equipment and small soil mass, involving fewer errors caused by boundary conditions. Furthermore, it can be used for in situ testing, such as quality control, assessment of ground improvement, and subgrade characterization. A database comprising MiniCone and CPT records in field and physical modeling is proposed with a variety of cone diameters. The case study records in the database have been obtained from 140 tests compiled from data from 26 sources. The sources include the results of 20 physical modelings and field data from six sites in 10 countries. The data comprise MiniCone and CPT cone tip resistance (), and sleeve friction (). The different cones are used in sandy, silty sand, and clayey soils via simple chambers (1 g), calibration chambers, and frustum confining vessels. In addition, correlations were found in penetration records in terms of physical modeling types, cone diameters, penetration rates, and soil densities. Moreover, and are related to capacities of pile toes and shafts using proper correlation coefficients less than unity, respectively. Correlations and dominant factors in geotechnical practice between MiniCone, CPT, and pile have been reviewed and discussed.

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“…Issues such as the behavior of the helical anchor and pile group [51,225], the use of HeliCAP specialized software for the design of helical members [68], the use of helical piles in offshore structures [69,70,72,75,222], and research on the lateral bearing of helical anchors and piles [62, 116, 148, 149, 157, 179, 187-189, 201, 206, 217, 221] are cases where special research has been carried out on them. Also, physical modeling of helical piles using FCV [63,95,110,186], studying on GFRP screws anchors [158], helical soil nails [163,164,169,190,200,284,294], using CPT test results to estimate the installation torque and bearing capacity of the helical piles [92,143,175,226] are other issues that have been investigated. Some research has also been carried out on the changes in configuration, materials, and grout usage to increase the bearing capacity of the helical anchors and piles [293].…”

Section: The Progress Rate Of Helical Foundationsmentioning

confidence: 99%

A review of the advancement of helical foundations from 1990- 2020 and the barriers to their expansion in developing countries

Mahmoudi-Mehrizi¹,

Ghanbari²

2021

jeg

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The use of piles, helical anchors, in general, helical foundations has considerably increased in the last 30 years. The adoption of this technology in the international and domestic codes of each country, as well as in research and studies, and, finally, the publication of numerous books and papers in this area, and the existence of manufacturers' products, committees, and contractors of this technology has contributed to its expansion and development. However, such methods have progressed at a very slow pace in many countries, especially in developing countries. This paper attempts to assess the global advancement of the helical foundations by reviewing 292 papers from 1990 to 2020 and comparing the related research findings. This will help clarify the issue and determine the scope of technological progress. On the other hand, collecting valuable papers in this area will make it easier for researchers to make further research.Subsequently, the characteristics of this technology are highlighted and the reasons for its lack of progress in developing countries are addressed. For this purpose, a questionnaire is sent to researchers, developers, designers, and contractors of the geotechnical projects. The purpose of this questionnaire is to specify the type of existing projects, the soil type of project site, the degree of familiarity with the helical foundation technology, the reasons for not using this method, and the solutions available to expand and develop this method. Finally, there are suggestions to develop this approach and the issues that need further research.

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Geotechnical Behavior of Helical Piles Via Physical Modeling by Frustum Confining Vessel (FCV)

Abstract: ABSTRACT

Cited by 16 publications

References 12 publications

Performance Assessment of Screw Piles Embedded in Soft Clay

Performance Assessment of Screw Piles Embedded in Soft Clay

Dominant factors in MiniCone, CPT and pile correlations: A data‐based approach

A review of the advancement of helical foundations from 1990- 2020 and the barriers to their expansion in developing countries

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