{"id":84221,"date":"2020-04-06T18:00:00","date_gmt":"2020-04-06T16:00:00","guid":{"rendered":"https:\/\/www.geostru.eu\/prova-penetrometrica-dinamica\/"},"modified":"2020-04-06T18:14:51","modified_gmt":"2020-04-06T16:14:51","slug":"prova-penetrometrica-dinamica","status":"publish","type":"post","link":"https:\/\/www.geostru.eu\/ro\/blog\/2020\/04\/06\/prova-penetrometrica-dinamica\/","title":{"rendered":"Incercarea de penetrare dinamica"},"content":{"rendered":"<p><span style=\"color: #000000\">Testul const\u0103 \u00een m\u0103surarea rezisten\u021bei la penetrare a unui v\u00e2rf conic metalic, conectat la o tij\u0103 de o\u021bel extensibil. Tija este formata din adaos de tije succesive, lipite pe verticala, avand dimensiune standard si masa cunoscuta. Tijele sunt introduse \u00een p\u0103m\u00e2nt prin batere si sunt lasate s\u0103 cad\u0103 de la aceeasi \u00een\u0103l\u021bime.<\/span><\/p>\n<p><span style=\"color: #000000\">Informa\u021bia furnizat\u0103 de test este continu\u0103, deoarece m\u0103sur\u0103torile rezistentei la penetrare se efectueaz\u0103 pe tot parcursul incercarii.<\/span><\/p>\n<p><span style=\"color: #000000\">Se inregistreaza num\u0103rul de batai necesare penetr\u0103rii fiec\u0103rei por\u021biuni de lungime stabilit\u0103.<\/span><\/p>\n<p><span style=\"color: #000000\">Testele de penetrare dinamica continue pot fi efectuate conform unor standarde diferite, \u00een func\u021bie de combina\u021biile parametrilor adopta\u021bi:<\/span><\/p>\n<ul>\n<li><span style=\"color: #000000\">masa maiului (10 \u00f7 100 kg);<\/span><\/li>\n<li><span style=\"color: #000000\">\u00een\u0103l\u021bimea de c\u0103dere (200 \u00f7 760 mm);<\/span><\/li>\n<li><span style=\"color: #000000\">diametrul v\u00e2rfului conului (22 \u00f7 63 mm);<\/span><\/li>\n<li><span style=\"color: #000000\">forma v\u00e2rfului (unghi de deschidere 60 \u00b0 &#8211; 90 \u00b0, extensie la baza conului);<\/span><\/li>\n<li><span style=\"color: #000000\">diametrul exterior al tijei (16 \u00f7 45 mm);<\/span><\/li>\n<li><span style=\"color: #000000\">p\u0103trunderea de referin\u021b\u0103 (100 \u00f7 300 mm);<\/span><\/li>\n<li><span style=\"color: #000000\">metoda de eliminare sau reducere a frecarii laterale de-a lungul barelor (acoperire, noroi prin tije, diametrul v\u00e2rfului&gt; diametrul tijei).<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000\">Caracteristicile echipamentului \u0219i metodele de execu\u021bie au fost standardizate \u00een Procedurile Interna\u021bionale de Referin\u021b\u0103 elaborate de <a style=\"color: #000000\" href=\"http:\/\/issmfe.org\">ISSMFE<\/a> si includ patru tipuri de penetrometru, clasificat \u00een func\u021bie de masa maiului:<\/span><\/p>\n<table style=\"height: 135px\" width=\"570\">\n<tbody>\n<tr style=\"background-color: #d6c7c7\">\n<td style=\"width: 182px\"><span style=\"color: #000000\"><strong>TIP<\/strong><\/span><\/td>\n<td style=\"width: 182px\"><span style=\"color: #000000\"><strong>Cod de referin\u021b\u0103<\/strong><\/span><\/td>\n<td style=\"width: 183.333px\"><span style=\"color: #000000\"><strong>Masa M(kg)<\/strong><\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 182px\"><span style=\"color: #000000\">U\u0219or<\/span><\/td>\n<td style=\"width: 182px\"><span style=\"color: #000000\">DPL (u\u0219or)<\/span><\/td>\n<td style=\"width: 183.333px\"><span style=\"color: #000000\">M \u2264 10<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 182px\"><span style=\"color: #000000\">Mediu<\/span><\/td>\n<td style=\"width: 182px\"><span style=\"color: #000000\">DPM (mediu)<\/span><\/td>\n<td style=\"width: 183.333px\"><span style=\"color: #000000\">10 &lt; M &lt; 40<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 182px\"><span style=\"color: #000000\">Greu<\/span><\/td>\n<td style=\"width: 182px\"><span style=\"color: #000000\">DPH (greu)<\/span><\/td>\n<td style=\"width: 183.333px\"><span style=\"color: #000000\">40 &lt; M &lt; 60<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 182px\"><span style=\"color: #000000\">Super greu<\/span><\/td>\n<td style=\"width: 182px\"><span style=\"color: #000000\">DPSH (super greu)<\/span><\/td>\n<td style=\"width: 183.333px\"><span style=\"color: #000000\">M \u2265 60<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"color: #000000\">Rezisten\u021ba la penetrare dinamic\u0103 pe con, <strong>Rpd,<\/strong> \u00een func\u021bie de num\u0103rul de lovituri <strong>N,<\/strong> este evaluat\u0103 folosind <strong>formula olandez\u0103<\/strong>:<\/span><\/p>\n<p style=\"text-align: center\"><span style=\"color: #000000\">Rpd = M<sup>2<\/sup>\u00b7H\/[A\u00b7e\u00b7(M + P)] = M<sup>2<\/sup>\u00b7H\u00b7N\/[A\u00b7\u03b4\u00b7(M + P)]<\/span><\/p>\n<p><span style=\"color: #000000\">Unde:<\/span><\/p>\n<ul>\n<li><span style=\"color: #000000\">Rpd = rezisten\u021ba la penetrare dinamic\u0103 pe con (zona A);<\/span><\/li>\n<li><span style=\"color: #000000\">e = \u03b4 \/ N = patrunderea conului sub o singura lovitura;<\/span><\/li>\n<li><span style=\"color: #000000\">M = masa oscilant\u0103 (\u00een\u0103l\u021bimea de c\u0103dere H);<\/span><\/li>\n<li><span style=\"color: #000000\">P = masa total\u0103 a barelor \u0219i a sistemului.<\/span><\/li>\n<\/ul>\n<h4 style=\"text-align: center\"><span style=\"color: #000000\"><strong>Test de penetrare dinamic\u0103 SPT (<a style=\"color: #000000\" href=\"https:\/\/en.wikipedia.org\/wiki\/Standard_penetration_test\">test de penetrare standard<\/a>)<\/strong><\/span><\/h4>\n<p><span style=\"color: #000000\">Testul SPT se efectueaz\u0103 \u00een timpul for\u0103rii. Acesta const\u0103 \u00een \u00eenregistrarea num\u0103rului de lovituri necesare pentru a penetra 45 cm \u00een teren, prin gaura de foraj, un tub de prelevare de dimensiuni standard. Tubul este conectat la suprafa\u021b\u0103 prin intermediul bateriei de tije pe care ac\u021bioneaz\u0103 o greutate de 63,5 kg, care cade liber de la \u00een\u0103l\u021bimea de 0,76 m.<\/span><\/p>\n<p><span style=\"color: #000000\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-36030 size-full aligncenter\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2017\/07\/SPT.png\" alt=\"\" width=\"461\" height=\"358\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2017\/07\/SPT.png 461w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2017\/07\/SPT-300x233.png 300w\" sizes=\"(max-width: 461px) 100vw, 461px\" \/><\/span><\/p>\n<p><span style=\"color: #000000\">\u00cen timpul testului se m\u0103soar\u0103:<\/span><\/p>\n<ul>\n<li><span style=\"color: #000000\">N1 = num\u0103rul de lovituri necesare pentru a introduce in teren sond\u0103 primii 15 cm, considerate sec\u021biunea &#8222;start&#8221;;<\/span><\/li>\n<li><span style=\"color: #000000\">N2 = num\u0103rul de lovituri necesare pentru patrunderea sondei pentru urm\u0103torii 15 cm;<\/span><\/li>\n<li><span style=\"color: #000000\">N3 = num\u0103rul de lovituri necesare ultimilor 15 cm de progres.<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000\">Valoarea ob\u021binut\u0103 este asimilat\u0103 ca rezisten\u021b\u0103 la penetrare:<\/span><\/p>\n<p style=\"text-align: center\"><span style=\"color: #000000\">N<sub>SPT<\/sub> = N<sub>2<\/sub> + N<sub>3<\/sub><\/span><\/p>\n<p><span style=\"color: #000000\">Se folose\u0219te urm\u0103torul echipament standard:<\/span><\/p>\n<ul>\n<li><span style=\"color: #000000\">tije de pilo\u021bi cu un diametru exterior de 50 mm \u0219i o greutate de 7 kg \/ m;<\/span><\/li>\n<li><span style=\"color: #000000\">capul de o\u021bel \u00een\u0219urubat pe temple;<\/span><\/li>\n<li><span style=\"color: #000000\">ciocan de o\u021bel de 63,5 kg;<\/span><\/li>\n<li><span style=\"color: #000000\">dispozitiv automat care permite c\u0103tu\u0219ului s\u0103 cad\u0103 de la o \u00een\u0103l\u021bime de 0,76 m;<\/span><\/li>\n<li><span style=\"color: #000000\">ghidarea dispozitivului de centrare pentru tije;<\/span><\/li>\n<li><span style=\"color: #000000\">etalon standard (numit Raymond de la compania care la introdus prima). Este un tub carotier cu un diametru exterior de 51 mm, o grosime de 16 mm \u0219i o lungime total\u0103 de 813 mm;<\/span><\/li>\n<li><span style=\"color: #000000\">\u00een terenuri necoezive, man\u0219eta este \u00eenlocuit\u0103 cu un v\u00e2rf conic cu diametru de 51 mm, si unghiul de 60 \u00b0.<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000\"><strong>Receptorul Raymond<\/strong> const\u0103 \u00eentr-un tub care este divizat longitudinal pe jum\u0103tate; cele dou\u0103 semituburi sunt \u021binute \u00eempreun\u0103, \u00een timpul introducerii, de un man\u0219on \u00een\u0219urubat la baz\u0103 \u0219i un inel la partea superioar\u0103. La sf\u00e2r\u0219itul testului, man\u0219onul este de\u0219urubat, tubul se deschide \u00een dou\u0103, permi\u021b\u00e2nd extragerea e\u0219antionului.<\/span><\/p>\n<p><span style=\"color: #000000\">Vasta utilizarea a incercarii SPT se datoreaz\u0103, \u00een principal, u\u0219urin\u021bei de realizare, putand fi efectuat\u0103 \u00een orice tip de teren \u00een timpul execu\u021biei forajelor, f\u0103r\u0103 adoptarea de echipamente suplimentare; utilizarea sa \u00een \u00eentreaga lume a condus la producerea unei bibliografii abundente care u\u0219ureaz\u0103 interpretarea rezultatelor ob\u021binute.<\/span><\/p>\n<p><span style=\"color: #000000\">Exist\u0103 numeroase corela\u021bii \u00eentre rezisten\u021ba la penetrare (NSPT) \u0219i parametrii geotehnici pentru terenuri coezive si necoezive, din care amintim:<\/span><\/p>\n<h5><span style=\"color: #000000\"><strong>TERENURI NECOEZIVE<\/strong><\/span><\/h5>\n<p><span style=\"color: #000000\">Cele mai adecvate corela\u021bii \u00eentre rezisten\u021ba la penetrare (NSPT) \u0219i parametri geotehnici sunt prezentate in cele ce urmeaza:<\/span><\/p>\n<p><span style=\"color: #000000\"><strong>1) <a style=\"color: #000000\" href=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2017\/07\/GIBBS_HOLTS.png\">Gibbs &amp; Holtz (1957)<\/a><\/strong><\/span><\/p>\n<p><span style=\"color: #000000\">Permite determinarea densit\u0103\u021bii relative a terenurilor necoezive prin intermediul rela\u021biei dintre rezisten\u021ba la penetrare \u0219i presiunea vertical\u0103 efectiv\u0103.<\/span><\/p>\n<p style=\"text-align: left\"><span style=\"color: #000000\"><strong>2) <a style=\"color: #000000\" href=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2017\/07\/DE_MELLO.png\">Corela\u021bia lui De Mello<\/a><\/strong><\/span><\/p>\n<p><span style=\"color: #000000\">Permite determinarea unghiului de frecare interna \u00een func\u021bie de for\u021ba vertical\u0103 efectiv\u0103.<\/span><\/p>\n<p><span style=\"color: #000000\"><strong>3) <a style=\"color: #000000\" href=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2017\/07\/DE_MELLO.png\">Corela\u021biile\u00a0 lui Schmertmann<\/a><\/strong><\/span><\/p>\n<p><span style=\"color: #000000\">In cadrul acestor corelatii se raporteaza valorea unghiul de frecare interna la valoarea densitatii relative, \u00een func\u021bie de dimensiunile particulelor rezultate din curba granulometrica, folosind at\u00e2t valorile densit\u0103\u021bii relative Dr obtinute cu metoda Gibbss-Hotz, c\u00e2t \u0219i cu metoda Terzaghi-Pech-Skempon.<\/span><\/p>\n<p style=\"text-align: center\"><span style=\"color: #000000\"><span style=\"font-family: symbol\">f\u00a0<\/span>= 28+0.14\u00b7Dr<\/span><\/p>\n<p style=\"text-align: center\"><span style=\"color: #000000\"><span style=\"font-family: symbol\">f\u00a0<\/span>= 31.5+0.115\u00b7Dr<\/span><\/p>\n<p style=\"text-align: center\"><span style=\"color: #000000\"><span style=\"font-family: symbol\">f<\/span>\u00a0= 34.5+0.10\u00b7Dr<\/span><\/p>\n<p style=\"text-align: center\"><span style=\"color: #000000\"><span style=\"font-family: symbol\">f<\/span>\u00a0= 38+0.08\u00b7Dr<\/span><\/p>\n<p><span style=\"color: #000000\"><strong>4) Corela\u021bii \u00eentre rezisten\u021ba la penetrarea NSPT \u0219i compresibilitate\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/strong><\/span><\/p>\n<p><span style=\"color: #000000\">Metodele utilizate sunt \u00eemp\u0103r\u021bite \u00een dou\u0103 categorii.<\/span><\/p>\n<p><span style=\"color: #000000\">Prima categorie se bazeaza pe corelarea valorii rezisten\u021bei la penetrare dinamica cu valoarea tasarii. In cadrul acestei categorii sunt incluse metodele Terzaghi \u0219i Peck, Meyerhof \u0219i Peck-Bazaraa.<\/span><\/p>\n<p><span style=\"color: #000000\">A doua categorie se refera la corela\u021biile empirice \u00eentre NSPT \u0219i modulul de deformatie liniara a nisipurilor; In cadrul acestei categorii sunt incluse metodele Alpan,\u00a0 D\u2019Apollonia, Parry.<\/span><\/p>\n<p><span style=\"color: #000000\">In urma compararii valorilor tas\u0103rilor calculate cu diferite metode empirice cu valorile tas\u0103rilor reale, m\u0103surate \u00een America de Peck (1948) &#8211; Bazaara (1967) &#8211; Baker (1965), Parry (1971), rezulta ca metoda Peck este cea mai corespunzatoare, \u00een timp ce metodele cele mai testate sunt cele ale lui Meyerhof, Peck-Bazaraa, Alpan \u0219i Burland-Burbidge (1984).<\/span><\/p>\n<h5><span style=\"color: #000000\"><strong>TERENURI COEZIVE\u00a0\u00a0<\/strong><\/span><\/h5>\n<p><span style=\"color: #000000\">Cea mai utilizata corela\u021bie este Terzaghi-Peck, bazata pe valoarea rezisten\u021bei la penetrarea NSPT, consisten\u021ba pamantului \u0219i valoarea coeziunii nedrenat\u0103 Cu.<\/span><\/p>\n<p><span style=\"color: #000000\">Dar rela\u021bia dintre NSPT \u0219i Cu se poate aplica doar in cazul argilelor sensibile. Aceste tipuri de argile sunt definite ca avand\u00a0 sensibilitatea A = Cu,i \/ Cu,r (raportul dintre coeziunea nedrenat\u0103 a e\u0219antionului netulburat \u0219i coeziunea nedrenat\u0103 a e\u0219antionului tulburat), raportul A are valori cuprinse intre 4 si 8.<\/span><\/p>\n<p><span style=\"color: #000000\">\u00cen restul cazurilor, evaluarea parametrilor pamanturilor coezive, bazat\u0103 pe valoarea rezisten\u021bei la penetrare dinamica NSPT este considerat\u0103 nesigur\u0103.<\/span><\/p>\n<h4 style=\"text-align: center\"><span style=\"color: #000000\">Corelarea testului de penetrarea dinamica continua cu testul SPT<\/span><\/h4>\n<p><span style=\"color: #000000\">Corela\u021bia care leag\u0103 num\u0103rul de lovituri N care se ob\u021bin din testul DP \u0219i valoarea NSPT care se ob\u021bine din testul SPT este urm\u0103toarea:<\/span><\/p>\n<p style=\"text-align: center\"><span style=\"color: #000000\">N<sub>SPT<\/sub> = \u03b2t\u00b7N<\/span><\/p>\n<p><span style=\"color: #000000\">Unde:<\/span><\/p>\n<p style=\"text-align: center\"><span style=\"color: #000000\">\u03b2t=(Q<span style=\"font-size: 11.6667px\">\/<\/span>Q<sub>SPT<\/sub>)<\/span><\/p>\n<p><span style=\"color: #000000\">Q este energia specific\u0103 pe lovitur\u0103 \u0219i Q<sub>SPT<\/sub> este energia corespunzatoare testului SPT.<\/span><\/p>\n<p><span style=\"color: #000000\">Odat\u0103 identificat\u0103 valoarea N<sub>SPT <\/sub>corelat\u0103 cu num\u0103rul de lovituri, caracteristicile geotehnice ale terenurilor sunt ob\u021binute folosind acelea\u0219i corela\u021bii valabile pentru testele SPT.<\/span><\/p>\n<p style=\"text-align: center\"><span style=\"color: #000000\">CALCULAREA (N<sub>1<\/sub>)<sub>60<\/sub><\/span><\/p>\n<p><span style=\"color: #000000\">(N<sub>1<\/sub>)<sub>60<\/sub>\u00a0 este num\u0103rul normal de lovituri, definit astfel:<\/span><\/p>\n<p style=\"text-align: center\"><span style=\"color: #000000\">(N<sub>1<\/sub>)<sub>60<\/sub>\u00a0= CN\u00b7N<sub>60<\/sub> (Liao e Whitman 1986)<\/span><\/p>\n<p style=\"text-align: left\"><span style=\"color: #000000\">unde:<\/span><\/p>\n<p style=\"text-align: center\"><span style=\"color: #000000\">CN=(Pa\/<span style=\"font-family: symbol\">s<\/span><sub>v0<\/sub>)<\/span><\/p>\n<ul>\n<li style=\"text-align: left\"><span style=\"color: #000000\">CN&lt;1.7 si Pa= 101.32 kPa<\/span><\/li>\n<\/ul>\n<p style=\"text-align: center\"><span style=\"color: #000000\">N<sub>60<\/sub>=N<sub>SPT<\/sub>\u00b7(ER\/60)\u00b7C<sub>s<\/sub> \u00b7C<sub>r<\/sub> \u00b7C<sub>d<\/sub><\/span><\/p>\n<p><span style=\"color: #000000\">unde:<\/span><\/p>\n<ul>\n<li><span style=\"color: #000000\">ER &#8211; raportul de energie a echipamentului conform ASTM-D-4633-86;<\/span><\/li>\n<li><span style=\"color: #000000\">Cs &#8211; factor de corectie datorat prezentei sau absentei mansonului (daca nu se ia in considerare mansonul valoarea Cs=1,2);\u00a0<\/span><\/li>\n<li><span style=\"color: #000000\">Cd &#8211; factor de corectie in functie de diametrul gaurii de foraj (pentru foraje avand diametrul intre 65-115mm, valoare Cd=1);<\/span><\/li>\n<li><span style=\"color: #000000\">Cr &#8211; factor de corectie datorat lungimii tijelor de batere.<\/span><\/li>\n<\/ul>\n<blockquote>\n<p style=\"text-align: center\"><span style=\"color: #000000\"><a style=\"color: #000000\" href=\"https:\/\/www.geostru.eu\/ro\/shop\/software-ro\/incercari-in-situ\/dynamic-probing-incercari-de-penetrometrie-dinamica\/\">DYNAMIC PROBING<\/a> ESTE CEL MAI UTILIZAT SOFTWARE \u00a0DIN LUME PENTRU PROCESAREA TESTELOR DE PENETRARE DINAMICA CONTINUA.<\/span><\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>Testul const\u0103 \u00een m\u0103surarea rezisten\u021bei la penetrare a unui v\u00e2rf conic metalic, conectat la o tij\u0103 de o\u021bel extensibil. Tija este formata din adaos de tije succesive, lipite pe verticala, avand dimensiune standard si masa cunoscuta. Tijele sunt introduse \u00een p\u0103m\u00e2nt prin batere si sunt lasate s\u0103 cad\u0103 de la aceeasi \u00een\u0103l\u021bime. Informa\u021bia furnizat\u0103 de&hellip;<\/p>\n","protected":false},"author":16939,"featured_media":36032,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[592,591,589,644,861,80,74],"tags":[782],"class_list":["post-84221","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articole-geotehnic","category-articole-pentru-geologie","category-inginerie-civila","category-news-ro","category-pubblicazioni-ro","category-publicatii","category-uncategorized-ro","tag-prova-penetrometrica-dinamica","category-592","category-591","category-589","category-644","category-861","category-80","category-74","description-off"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v25.0) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Incercarea de penetrare dinamica - GeoStru EU<\/title>\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\/2020\/04\/06\/prova-penetrometrica-dinamica\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Incercarea de penetrare dinamica\" \/>\n<meta property=\"og:description\" content=\"Testul const\u0103 \u00een m\u0103surarea rezisten\u021bei la penetrare a unui v\u00e2rf conic metalic, conectat la o tij\u0103 de o\u021bel extensibil. Tija este formata din adaos de tije succesive, lipite pe verticala, avand dimensiune standard si masa cunoscuta. Tijele sunt introduse \u00een p\u0103m\u00e2nt prin batere si sunt lasate s\u0103 cad\u0103 de la aceeasi \u00een\u0103l\u021bime. 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