{"id":25848,"date":"2016-12-01T09:27:39","date_gmt":"2016-12-01T07:27:39","guid":{"rendered":"https:\/\/www.geostru.eu\/ro\/?p=25848"},"modified":"2016-12-01T09:27:39","modified_gmt":"2016-12-01T07:27:39","slug":"calcularea-valorii-n1-60","status":"publish","type":"post","link":"https:\/\/www.geostru.eu\/ro\/blog\/2016\/12\/01\/calcularea-valorii-n1-60\/","title":{"rendered":"Incercari de penetrometrie dinamica Calcularea valorii N60"},"content":{"rendered":"

Incercari de penetrometrie dinamica Calcularea valorii N60<\/h2>\n

Corelatiile recente pentru NSPT, densitate relativa si unghi de rezistenta la forfecare\u00a0 pentru terenurile granulare sunt prevazute cu valori ale rezistentei penetrometrice in functie de N60 (NSPT=N60 dupa Cestari, 1996) sau N1,60 valoare normalizata la o tensiune geostatica verticala de 1 bar prin aplicarea coeficientului CN (Liao Withman 1986).<\/p>\n

N60=NSPT*CE<\/p>\n

N60: \u00a0Valoarea lui NSPT normalizat la 60% din energia transmisa de berbec (dupa<\/strong> Cestari N60=NSPT<\/strong>)<\/p>\n

 <\/p>\n

CE=ER\/60<\/p>\n

Energiile diferitelor sisteme variaza de la 45% la 98%<\/p>\n

N1,60= NSPT*CE*CN*CR*CB*CS<\/p>\n

CN=(Pa\/\u03c3\u2019v)^1\/2 Liao si Withman( 1986)<\/p>\n

pa=presiunea atmosferica= 98.1 Kpa<\/p>\n

CN=2\/(1+\u03c3’v\/100) Skempton (1986) Nisipuri fine<\/p>\n

CN=3\/(2+\u03c3’v\/100) Skempton (1986) Nisipuri grosolane<\/p>\n

Normalizare la o tensiune verticala de 100 Kpa (1 Kg\/cm2<\/sup>)
\nCN: \u00a0\u00a0\u00a0\u00a0 Coeficientul de corectie in functie de tensiunea verticala
\nCE: \u00a0\u00a0\u00a0\u00a0\u00a0 Factorul de corectie datorat sistemului de batere
\nCR: \u00a0\u00a0\u00a0\u00a0\u00a0 Factorul de corectie datorat lungimii tijelor de batere
\nCB: \u00a0\u00a0\u00a0\u00a0\u00a0 Factorul de corectie datorat diametrului gaurii de foraj
\nCS: \u00a0\u00a0\u00a0\u00a0\u00a0 Factorul de corectie datorat prezentei sau absentei mansonului<\/p>\n

ER: \u00a0\u00a0\u00a0\u00a0\u00a0 Raportul de energie a echipamentului conform ASTM D-4633-86<\/p>\n

CN in aplicatiile practice nu poate avea o valoare mai mare de 2 si preferabil nu mai mare de 1.5. Corectia CN se aplica doar pentru calculul densitatii relative si a unghiului de rezistenta la forfecare, nu se aplica pentru calculul parametrilor nedrenati si de deformabilitate.<\/p>\n

 <\/p>\n

DENSITA<\/strong>TEA <\/strong>RELATIVA<\/strong><\/p>\n

Dr=(N1,60\/A)^1\/2\u00a0\u00a0\u00a0\u00a0\u00a0 Skempton (1986)<\/em><\/p>\n

A: constanta variabila intre 55-65 pentru nisipuri de la fine la grosolane.<\/p>\n

Parametrul A este exprimat conform Cubrinowski <\/em>si<\/em> Ishihara (1999-2000)<\/em> ca functie a diferentei dintre indicele golurilor maxim si minim.<\/p>\n

A=9\/(emax-emin)1.7<\/p>\n

Campurile de variatie a (emax-emin) sunt preluate din Das et al. (2012) pentru nisipuri curate si nisipuri prafoase, in timp ce pentru pietris se poate face referire la datele oferite de Jamiokowakj <\/em>si<\/em> Lo Presti (2003)<\/em>.<\/em><\/p>\n

emax-emin=0.19-0.29<\/p>\n

 <\/p>\n

UNGHIUL DE REZISTENTA LA FORFECARE<\/strong><\/p>\n

Corelatiile cele mai folosite in ultimi ani, conform NCHRP (2010) sunt:<\/p>\n

\u03c6\u2019=54-27.6034*exp(-0.014*N1,60)\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Kulhawy & Mayne (1990)<\/p>\n

\u03c6\u2019=(20*N1,60)0.5+20 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 [pentru N1,60=3.5-30]\u00a0 Hutanaka & Uchida (196)<\/p>\n

\u03c6\u2019=27.1+0.3*N1,60-0.00053*N1,602 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Wolff (1989)<\/p>\n

\u03c6\u2019=(15.4*N1,60)0.5+20\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Mayne et al. (2001)<\/p>\n

\u03c6\u2019=(15*N1,60)0.5+15 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 [pentru N1,60>5 j<45]\u00a0 JRA (1996)<\/p>\n

Recent Brown <\/em>si<\/em> Hettirachchi (2008)<\/em><\/a> folosesc valori mai precaute ale unghiului de rezistenta la forfecare fata de cele precedente care pot fi aproximate cu cele ale unghiului de frecare la volum constant adica rezistenta la forfecare in conditii critice fata de care deformatiile ulterioare au loc fara a varia volumul:<\/p>\n

\u03c6\u2019=0.3818*tan-1(0.25*N60Pa\/\u03c3\u2019v)<\/p>\n

Dynamic Probing \u2013 Incercari de penetrometrie dinamica<\/a><\/h1>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Incercari de penetrometrie dinamica Calcularea valorii N60 Corelatiile recente pentru NSPT, densitate relativa si unghi de rezistenta la forfecare\u00a0 pentru terenurile granulare sunt prevazute cu valori ale rezistentei penetrometrice in functie de N60 (NSPT=N60 dupa Cestari, 1996) sau N1,60 valoare normalizata la o tensiune geostatica verticala de 1 bar prin aplicarea coeficientului CN (Liao Withman…<\/p>\n","protected":false},"author":216,"featured_media":25502,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[592,591,4749,644,861],"tags":[],"class_list":["post-25848","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articole-geotehnic","category-articole-pentru-geologie","category-general-ro","category-news-ro","category-pubblicazioni-ro","category-592","category-591","category-4749","category-644","category-861","description-off"],"yoast_head":"\nIncercari de penetrometrie dinamica Calcularea valorii N60<\/title>\n<meta name=\"description\" content=\"Corelatiile recente pentru NSPT, densitate relativa si unghi de rezistenta la forfecare pentru terenurile granulare sunt prevazute cu valori ale rezistente\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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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. 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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). 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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\/25848"}],"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=25848"}],"version-history":[{"count":0,"href":"https:\/\/www.geostru.eu\/ro\/wp-json\/wp\/v2\/posts\/25848\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.geostru.eu\/ro\/wp-json\/wp\/v2\/media\/25502"}],"wp:attachment":[{"href":"https:\/\/www.geostru.eu\/ro\/wp-json\/wp\/v2\/media?parent=25848"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.geostru.eu\/ro\/wp-json\/wp\/v2\/categories?post=25848"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.geostru.eu\/ro\/wp-json\/wp\/v2\/tags?post=25848"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}