{"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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catanzariti","image":{"@type":"ImageObject","inLanguage":"ro-RO","@id":"https:\/\/www.geostru.eu\/ro\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/9e88e81129c39a0613a304f2a7204f77?s=96&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/9e88e81129c39a0613a304f2a7204f77?s=96&r=g","caption":"filippo catanzariti"},"description":"Filippo Catanzariti (04-06-1969 Calabria, Italy) is an engineer, buisnessman, and computer programmer. He graduated in civil engineering at the University of Calabria (UNICAL) with a thesis entitled \"Programma di calcolo per l\u2019analisi della stabilit\u00e0 dei pendii con metodi numerici avanzati\u201d (Calculation program for the analysis of slope stability with advanced numerical methods). From 1996-1999 he worked as an analyst and software developer specialized in algorithms and development in the main programming languages: pascal, vb, fortran, visual c ++ and in the web full stack developer. In 1999 he founded Geostru, the well-known international software company, for which he produced hundreds of software and sophisticated analysis algorithms. Maturing experience in: advanced mathematical models 2D \/ 3D and graphics programming with OpenGL and DirectX. Between 2000-2014 he was co-supervisor of numerous degree theses and author of technical articles published by Ingenium Edizioni. Between 2014-2019 he published articles in international technical journals and coordinated important university research projects. Since 2014 he is a member of: AGI, ISRM, ISSMGE, AGI-IGS and certificate of AGS (Association of Geotechnical & Geoenvironmental Specialists). Since 2016 he works as analyst, software developer, consultant for insourcing (SC ENGSOFT) and outsourcig activities for important international companies, in the European Silicon Valley, Cluj Napoca.","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}]}}