{"id":25866,"date":"2016-12-01T09:46:16","date_gmt":"2016-12-01T07:46:16","guid":{"rendered":"https:\/\/www.geostru.eu\/ro\/screw-piles-helical-anchors-soils\/"},"modified":"2016-12-01T09:46:16","modified_gmt":"2016-12-01T07:46:16","slug":"screw-piles-helical-anchors-soils","status":"publish","type":"post","link":"https:\/\/www.geostru.eu\/ro\/blog\/2016\/12\/01\/screw-piles-helical-anchors-soils\/","title":{"rendered":"Screw-Piles and Helical Anchors in Soils"},"content":{"rendered":"

Screw-Piles Helical Anchors Soils<\/a><\/h2>\n

This Guide should be used for preliminary calculations only and applies only to the deep installation of Screw-Piles and Helical Anchors in uniform soils. It is only applicable for design when the depth (D) to the top helical plate is greater than 10 times the diameter (B) of the helical plate and the minimum depth of embedment of the helical plate is 5 ft. The methods described in this Guide provide an estimate of the ULTIMATE capacity; the Engineer must apply an appropriate Factor of Safety to obtain the ALLOWABLE capacity. <\/strong><\/p>\n

General Bearing Capacity Equation<\/strong>
\nAt the present time, the design of Screw-Piles and Helical Anchors generally follows the traditional theory of General Bearing Capacity used for compression loading of foundations. Terzaghi\u2019s general bearing capacity equation for determining ultimate bearing capacity, as given in most Foundation Engineering textbooks is often stated as:<\/p>\n

qult = c\u2019Nc + q\u2019Nq + 0.5\u03b3\u2019BN\u03b3<\/p>\n

where:
\nqult = Ultimate Unit Bearing Capacity
\nc\u2019 = effective cohesion
\nq\u2019 = effective overburden stress = \u03b3\u2019D
\n\u03b3\u2019 = effective unit weight of soil
\nD = depth
\nB = diameter of \u00a0helix
\nNc, Nq, N\u03b3 = bearing capacity factors<\/p>\n

Notes on use of Terzaghi\u2019s General Bearing Capacity equation:
\n1. Because B is considered very small for Screw-Piles and Helical Anchors, relative to most concrete footings, some engineers choose to ignore the term 0.5\u03b3\u2019BN\u03b3 in design.
\n2. In saturated clays under compression loading, Skempton\u2019s (1951) Bearing Capacity Factor for shallow round helical plates may also be used: NC = 6.0(1 + 0.2D\/B) < 9.0
\n3. The unit weight of the soil is the total (wet) unit weight if the helical plate is above the water table and the buoyant unit weight if the helical plate is below the water table.
\n4. For saturated clay soils with \u03c6\u2019 = 0, Nq = 1.0; For sands, Nq is a function of friction angle, \u03c6\u2019
\n5. In all cases, for both compression and tension loading, the upper limit of capacity is governed by the mechanical strength of the Screw-Pile or Helical Anchor as provided by the manufacturer.<\/strong><\/p>\n

Contribution of Shaft to Capacity<\/strong>
\nMany Screw-Piles and Helical Anchors are manufactured with square central shafts. For these piles\/anchors, the contribution of the shaft to the ultimate capacity is usually ignored and the total capacity is only calculated from the bearing capacity of the helical plate(s). For Screw-Piles and Helical Anchors with round steel central shafts the shaft section between plates for multi-helix elements is ignored, but the shaft above the top plate may be included in design, at least for that section of the shaft in full contact with the soil as discussed in Section 3.<\/p>\n

DEEP Single-Helix Screw-Piles and Helical Anchors<\/strong>
\nDeep installations of Screw-Piles and Helical Anchors are generally more common than shallow installations, provided there is sufficient soil depth to perform the installation. The reason is that higher load capacities are generally developed from a deeper installation in the same soil.<\/p>\n

Compression Loading of Screw-Piles in CLAY<\/strong>
\nUnder both compression and tension loading of deep Screw-Piles and Helical Anchors in clay, the ultimate capacity is obtained using the Total Stress Analysis (TSA) and undrained shear strength. In saturated clays with \u03c6\u2019 = 0 and c = su the bearing capacity equation is often give as:<\/p>\n

QH = AH(Nc)su \u00a0 \u00a0 [1.1]<\/p>\n

where:
\nQH = Ultimate Bearing Capacity in Compression
\nsu = undrained shear strength
\nNc = Bearing Capacity Factor for clays with \u03c6\u2019 = 0; for round plates NC = 6.0(1 + 0.2D\/B) < 9
\nAH = Effective area of the helical plate For deep installations, NC = 9, which gives: QH = AH(9)(su)<\/p>\n

For deep installations, Nc = 9, which gives:<\/p>\n

QH = AH(9)(su)<\/p>\n

Compression Loading of Screw-Piles in SAND<\/strong>
\nFor deep installations of single-helix Screw-Piles and Helical Anchors in sand the ultimate capacity is obtained using the Effective Stress Analysis (ESA) from:<\/p>\n

QH = AH(\u03c3\u2019vo Nq + 0.5\u03b3\u2019BN\u03b3)<\/p>\n

where:<\/p>\n

\u03c3\u2019vo = vertical effective stress at the depth (D) of the helix = \u03b3\u2019D
\nNq and N\u03b3 = bearing capacity factors
\nB = Diameter of the helical plate
\n\u03b3\u2019 = effective unit weight of the soil<\/p>\n

The bearing capacity factor Nq is usually obtained from values used for determining the end bearing capacity for deep pile foundations. There have been a number of different recommendations for estimating Nq which are available in most foundation engineering textbooks, e.g., Fang & Winterkorn 1983:<\/p>\n

Nq = 0.5 (12 x \u03c6\u2019)^(\u03c6\u2019\/54)<\/p>\n

Because the area of the plate is usually small, the contribution of the \u201cwidth\u201d term (0.5\u03b3\u2019BN\u03b3)\u00a0to ultimate capacity is also very small and the width term is often ignored. This reduces to<\/p>\n

QH = AH(\u03c3\u2019vo Nq)<\/p>\n

DEEP Multi-Helix Screw-Piles and Helical Anchors<\/strong>
\nThe ultimate capacity of deep multi-helix Screw-Piles and Helical Anchors depends on the geometry of the helical section, namely the size and number of helical plates and the spacing between the plates. In the U.S. most manufacturers of Screw-Piles and Helical Anchors produce elements with a helix spacing of 3 times the helix diameter. This spacing is assumed to allow individual plates to develop full capacity with no interaction between plates and the total capacity is often taken as the sum of the capacities from each plate as shown in Figure.<\/p>\n

\"screw-piles\"<\/p>\n

Development of Capacity for Multi-Helix Screw-Piles and Helical Anchors with S\/D >3.<\/strong><\/p>\n

Compression and Tension Loading of Multi-Helix Screw-Piles
\nUltimate capacity of multi-helix Screw-Piles in compression and Helical Anchors in tension with a helix spacing\/diameter ration > 3 is often taken as the summation of the capacities of the individual plates:<\/p>\n

QM = \u03a3QH<\/p>\n

where:<\/p>\n

QM = Total Capacity of a Multi-Helix Screw-Pile\/Helical Anchor
\nQH = Capacity of an Individual Helix<\/p>\n

MP \u2013 Pile and Micropile<\/a><\/h1>\n
\n

Pile and micropile software is intended for calculation of the bearing capacity of the foundation terrain of a pile or micropile bearing loads in whatever distribution (moment, normal force, shear). Structural calculation yielding dimensions of longitudinal steel struts, interval and size of rings is also performed.<\/p>\n<\/div>\n

Reference
\nDr. Alan J. Lutenegger, P.E., F. ASCE for International Society for Helical Foundations (ISHF)
\n<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Screw-Piles Helical Anchors Soils This Guide should be used for preliminary calculations only and applies only to the deep installation of Screw-Piles and Helical Anchors in uniform soils. It is only applicable for design when the depth (D) to the top helical plate is greater than 10 times the diameter (B) of the helical plate…<\/p>\n","protected":false},"author":216,"featured_media":25858,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-25866","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","description-off"],"yoast_head":"\nScrew-Piles Helical Anchors Soils<\/title>\n<meta name=\"description\" content=\"This Guide should be used for preliminary calculations only and applies only to the deep installation of Screw-Piles and Helical Anchors in uniform soils.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.geostru.eu\/ro\/blog\/2016\/12\/01\/screw-piles-helical-anchors-soils\/\" \/>\n<meta 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He graduated in Civil Engineering, geotechnical track, at the University of Calabria in 1996, with a thesis entitled \"Programma di calcolo per l'analisi della stabilita dei pendii con metodi numerici avanzati\" (A calculation program for slope stability analysis using advanced numerical methods) - the work that became his first commercial product. He has been registered with the Order of Engineers of Reggio Calabria (no. 1839) since 1996. From 1996 to 1999 he worked as an analyst and software developer specialising in numerical algorithms, in Pascal, Visual Basic, Fortran and Visual C++, and in full-stack web development. He works with advanced 2D and 3D mathematical models and with graphics programming in OpenGL and DirectX. In 1999 he founded GeoStru, an international geotechnical software house whose catalogue he largely authored: slope stability and rockfall analysis, foundations and retaining structures, finite element analysis, geophysics and site investigation, hydrology and hydrogeology, and reinforced concrete design. Since 2016 he has run SC Engsoft S.r.l. in Cluj-Napoca, Romania, and he is technical and scientific consultant to GoMeeting. His most recent work is GeoStru.ai, a platform delivering geotechnical and civil calculation through natural-language conversation while keeping the analysis itself on deterministic, auditable algorithms. Between 2005 and 2013 he co-supervised degree theses at the University of Calabria and the Mediterranea University of Reggio Calabria. He teaches accredited professional-development courses for geologists and engineers under accreditation from the Italian Consiglio Nazionale dei Geologi. His peer-reviewed work includes papers in Green World Journal (2021), Marine and Petroleum Geology (2022), Journal of Mediterranean Earth Sciences (2022), Geosciences (2024) and Bulletin of Engineering Geology and the Environment (2026), together with memorie at the XXVII and XXVIII Italian National Geotechnical Conferences. He co-authored \"Terre rinforzate\" (EPC Editore, 2023) and \"Terrae Motus\". He has been a member of AGI, ISRM, ISSMGE and AGI-IGS since 2014, and holds a certificate from AGS (Association of Geotechnical & Geoenvironmental Specialists). ORCID: 0009-0001-2495-6395 - Scopus Author ID: 57936189800 - Google Scholar: ZiY1VZUAAAAJ","sameAs":["http:\/\/www.geostru.eu"],"url":"https:\/\/www.geostru.eu\/ro\/blog\/author\/filippo-catanzariti\/"}]}},"_links":{"self":[{"href":"https:\/\/www.geostru.eu\/ro\/wp-json\/wp\/v2\/posts\/25866"}],"collection":[{"href":"https:\/\/www.geostru.eu\/ro\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.geostru.eu\/ro\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.geostru.eu\/ro\/wp-json\/wp\/v2\/users\/216"}],"replies":[{"embeddable":true,"href":"https:\/\/www.geostru.eu\/ro\/wp-json\/wp\/v2\/comments?post=25866"}],"version-history":[{"count":0,"href":"https:\/\/www.geostru.eu\/ro\/wp-json\/wp\/v2\/posts\/25866\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.geostru.eu\/ro\/wp-json\/wp\/v2\/media\/25858"}],"wp:attachment":[{"href":"https:\/\/www.geostru.eu\/ro\/wp-json\/wp\/v2\/media?parent=25866"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.geostru.eu\/ro\/wp-json\/wp\/v2\/categories?post=25866"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.geostru.eu\/ro\/wp-json\/wp\/v2\/tags?post=25866"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}