{"id":11397,"date":"2023-11-14T09:06:56","date_gmt":"2023-11-14T09:06:56","guid":{"rendered":"https:\/\/blog.geostru.eu\/prova-di-permeabilita-in-cella-edometrica\/"},"modified":"2023-11-23T15:03:49","modified_gmt":"2023-11-23T15:03:49","slug":"test-de-permeabilitate-in-celula-edometrica","status":"publish","type":"post","link":"https:\/\/blog.geostru.eu\/ro\/test-de-permeabilitate-in-celula-edometrica\/","title":{"rendered":"Test de permeabilitate \u00een celul\u0103 edometric\u0103"},"content":{"rendered":"

Testul de permeabilitate \u00een celula edometric\u0103 are ca scop determinarea coeficientului de permeabilitate K prin aplicarea direct\u0103 a unei presiuni hidraulice variabile \u00een timpul testului edometric<\/a>.<\/p>\n

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Acest tip de test poate fi efectuat pe probe de sol compuse \u00een principal din loess \u0219i argile<\/strong> , ale c\u0103ror permeabilitate este mai mare de 10-6 – 10-7 m\/s.<\/p>\n

 <\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

Configura\u021bia avansat\u0103 a celulei edometrice<\/h2>\n

\u00cen aceast\u0103 experimentare, se folose\u0219te o celul\u0103 edometric\u0103 cu o configura\u021bie u\u0219or diferit\u0103 fa\u021b\u0103 de modelul conven\u021bional, deoarece are un acces practic \u00een interiorul celulei.\u00a0(Fig. 1<\/strong>). Acest acces este conectat la piatra poroas\u0103 de baz\u0103, permit\u00e2nd introducerea unui burete extern. \u00cen plus, celula este echipat\u0103 cu un inel de etan\u0219are cu garnitur\u0103 tip O-ring, plasat extern \u00eentre piatra poroas\u0103 \u0219i placa superioar\u0103 de centraj a probei examinate. Exist\u0103, de asemenea, un orificiu de evacuare superior care asigur\u0103 controlul \u0219i men\u021binerea nivelului hidraulic. (Fig.1 e 2<\/strong>).<\/p>\n

\"Strumentazione<\/p>\n

Aceast\u0103 configurare specific\u0103 a celulei edometrice este esen\u021bial\u0103 pentru asigurarea preciziei m\u0103sur\u0103torilor \u0219i a stabilit\u0103\u021bii mediului de test \u00een timpul execu\u021biei. Accesul practic permite manipularea u\u0219oar\u0103 a celulei, \u00een timp ce inelul de etan\u0219are tip O-ring contribuie la prevenirea pierderilor nedorite de fluid. Orificiul de evacuare superior este crucial pentru men\u021binerea nivelului hidraulic corect \u00een interiorul celulei, asigur\u00e2nd condi\u021bii ideale pentru analizele edometrice.<\/p>\n

Utilizarea buretelor pentru control hidraulic<\/h2>\n

Echipamentul este completat \u00een continuare prin ad\u0103ugarea a una sau mai multe burete, a c\u0103ror sec\u021biune transversal\u0103 variaz\u0103 de obicei \u00eentre 0.05 \u0219i 5 cm2, permi\u021b\u00e2nd o deplasare hidraulic\u0103 de aproximativ 50 cm (Fig. 3)<\/strong>. Aceste burete sunt dotate cu o scar\u0103 milimetric\u0103 gradat\u0103 \u00een lungime, nu \u00een volum, cu increment\u0103ri cresc\u00e2nde de la baz\u0103 \u00een sus.<\/p>\n

Buretele sunt pozi\u021bionate vertical \u0219i conectate la celula edometric\u0103 printr-un tub transparent \u0219i o robinet\u0103, asigur\u00e2nd un control precis al aportului hidraulic. Aceast\u0103 configura\u021bie asigur\u0103 o reglare precis\u0103 a nivelului hidraulic \u00een timpul experimentelor, contribuind astfel la detectarea precis\u0103 a datelor geotehnice \u0219i ob\u021binerea de rezultate \u0219tiin\u021bifice fiabile<\/p>\n

\"Particolare<\/p>\n

Prepararea celulei edometrice<\/h2>\n

Procedura de preg\u0103tire a celulei edometrice \u00eenainte de introducerea probei prezint\u0103 unele diferen\u021be fa\u021b\u0103 de metoda conven\u021bional\u0103. Mai jos, prezent\u0103m pa\u0219ii cheie pentru aceast\u0103 faz\u0103 critic\u0103:<\/p>\n

1.Reglarea buretei graduat:<\/strong>: \u00cencepem prin reglarea cu precizie a pozi\u021biei buretei gradate astfel \u00eenc\u00e2t citirea zero s\u0103 coincid\u0103 exact cu nivelul orificiului de evacuare din celul\u0103.
\n2. Umplerea \u0219i fluxul de ap\u0103:<\/strong>Ulterior, continu\u0103m prin umplerea buretei cu ap\u0103 distilat\u0103 \u0219i deschiderea robinetului de conexiune. Acest lucru permite fluidului s\u0103 se scurg\u0103 spre piatra poroas\u0103 inferioar\u0103, amplasat\u0103 \u00een interiorul celulei edometrice.
\n3. Saturarea complet\u0103 a circuitului<\/strong>: Este de importan\u021b\u0103 fundamental\u0103 s\u0103 acord\u0103m aten\u021bie deosebit\u0103 pentru a asigura c\u0103 \u00eentregul circuit este complet saturat. Prezen\u021ba bulelor de aer poate afecta negativ desf\u0103\u0219urarea corect\u0103 a testului.<\/p>\n

4. Nivelare \u0219i \u00eendep\u0103rtarea excesului de ap\u0103:<\/strong>Ulterior, restabilim nivelul apei \u00een buret\u0103 la valoarea dorit\u0103, apoi \u00eenchidem robinetul. Orice exces de ap\u0103 \u00een piatra poroas\u0103 inferioar\u0103 trebuie \u00eendep\u0103rtat cu aten\u021bie.<\/p>\n

Faza 1 – Compresiune edometric\u0103<\/h3>\n

Odat\u0103 finalizat\u0103 preg\u0103tirea celulei edometrice, se va trece la aplicarea treptelor de \u00eenc\u0103rcare, conform specifica\u021biilor din procedurile standard (Fig. 4).<\/strong> Precizia \u0219i aten\u021bia la detalii \u00een aceast\u0103 faz\u0103 preliminar\u0103 sunt fundamentale pentru ob\u021binerea de rezultate fiabile \u00een analizele geotehnice efectuate cu celula edometric\u0103.<\/p>\n

\"gradini<\/p>\n

Fiecare etap\u0103 de aplicare a treptelor de \u00eenc\u0103rcare implic\u0103 posibilitatea de a m\u0103sura coeficientul de permeabilitate la anumite \u00eenc\u0103rc\u0103turi de consolidare, cu condi\u021bia ca procesul s\u0103 fie finalizat anterior. Relevan\u021ba acestei m\u0103sur\u0103tori const\u0103 \u00een evitarea interferen\u021belor generate de gradientul hidraulic \u00een timpul procesului de consolidare, de aceea robinetul de conexiune \u00eentre buret\u0103 \u0219i celula edometric\u0103 trebuie s\u0103 fie \u00eenchis. Este important s\u0103 se sublinieze c\u0103 prima etap\u0103, „compresiune edometric\u0103”, preg\u0103titoare pentru m\u0103surarea efectiv\u0103 a permeabilit\u0103\u021bii, va fi considerat\u0103 \u00eencheiat\u0103 dup\u0103 24 de ore sau dup\u0103 stabilizarea consolid\u0103rii probei supuse \u00eenc\u0103rc\u0103rii verticale.<\/p>\n

Faza 2 – Test de permeabilitate direct\u0103\u00a0<\/strong><\/h3>\n

Procedura pentru realizarea testului de permeabilitate este urm\u0103toarea:
\n1. \u00cenc\u0103rcare hidraulic\u0103 preliminar\u0103:<\/strong> \u00cencepem prin ad\u0103ugarea unei cantit\u0103\u021bi adecvate de ap\u0103 distilat\u0103 pentru a ob\u021bine o \u00eenc\u0103rcare hidraulic\u0103 de aproximativ 50 cm. Este crucial s\u0103 ne asigur\u0103m c\u0103 temperatura apei este \u00een echilibru cu temperatura ambiental\u0103 \u0219i s\u0103 \u00eenregistr\u0103m aceast\u0103 valoare ca temperatur\u0103 de referin\u021b\u0103 pentru test.
\n2.M\u0103surarea nivelului apei:<\/strong> \u00cenregistr\u0103m nivelul apei \u00een interiorul buretei.
\n3.Deschiderea robinetului \u0219i pornirea cronometrului:<\/strong> Deschidem robinetul situat la baza celulei edometrice \u0219i, \u00een acela\u0219i timp, pornim cronometrul pentru a \u00eenregistra timpul.
\n4.Atingerea \u00eenc\u0103rc\u0103turii hidraulice dorite<\/strong>: Continu\u0103m m\u0103surarea p\u00e2n\u0103 c\u00e2nd atingem o \u00eenc\u0103rcare hidraulic\u0103 de aproximativ 10-15 cm. \u00cen acest punct, \u00eenchidem robinetul \u0219i aplic\u0103m \u00eenc\u0103rc\u0103tura edometric\u0103 pentru preg\u0103tirea urm\u0103toarei m\u0103sur\u0103tori a permeabilit\u0103\u021bii.<\/p>\n

Pentru fiecare valoare de \u00eenc\u0103rcare hidraulic\u0103 \u00eenregistrat\u0103, calcul\u0103m coeficientul de permeabilitate<\/strong> (indicat ca „k<\/strong>„) utiliz\u00e2nd urm\u0103toarea expresie:<\/p>\n

k=(H0<\/sub>) – \u03b4H) \u2219 ab<\/sub>\/As<\/sub> \u2219 (loge<\/sub> L0<\/sub>\/Lt<\/sub> )\/(tt<\/sub>-t0<\/sub>) \u2219 10-2<\/sup><\/p>\n

H0 \u00a0<\/sup><\/sub>= \u00een\u0103l\u021bimea ini\u021bial\u0103 a e\u0219antionului (cm)<\/p>\n

\u03b4H = cederea e\u0219antionului (cm)<\/p>\n

ab\u00a0<\/sub>= sec\u021biunea buretei gradate<\/p>\n

As\u00a0<\/sub>= sec\u021biunea e\u0219antionului<\/p>\n

L0 <\/sub>= lectura ini\u021bial\u0103 efectuat\u0103 la buret\u0103 gradat\u0103<\/p>\n

Lt <\/sub>= lectura ulterioar\u0103 efectuat\u0103 la momentul respectiv tt<\/sub><\/p>\n

t0 <\/sub>=istantele ini\u021biale corespunz\u0103toare lecturiiL0<\/sub> (sec)<\/p>\n

tt <\/sub>= Istantele succesive corespunz\u0103toare lecturii Lt<\/sub> (sec)<\/p>\n

Execu\u021bia corect\u0103 a acestei proceduri asigur\u0103 m\u0103sur\u0103tori precise ale coeficientului de permeabilitate \u0219i contribuie la precizia evalu\u0103rilor geotehnice efectuate \u00een cadrul experimentelor.<\/p>\n

Rezultate<\/h2>\n
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Rezultatele ob\u021binute din testul de permeabilitate \u00een celula edometric\u0103 furnizeaz\u0103 valorile permeabilit\u0103\u021bii la diferite \u00eenc\u0103rc\u0103turi. \u00cen special, aplicarea fiec\u0103rei \u00eenc\u0103rc\u0103turi individuale, adecvat calculate pe baza \u00eenc\u0103rc\u0103turii litostatice la ad\u00e2ncimea de prelevare, asigur\u0103 o valoare exact\u0103 a permeabilit\u0103\u021bii ob\u021binute din test. De asemenea, dac\u0103 orizontul din care a fost prelevat\u0103 proba este granulometric omogen, este posibil, prin varierea \u00eenc\u0103rc\u0103turii, s\u0103 se ob\u021bin\u0103 valori de permeabilitate la diferite ad\u00e2ncimi.<\/p>\n

\u00cen special, \u00een graficul prezentat mai jos (Fig.5)<\/strong>, se eviden\u021biaz\u0103 c\u0103 proba supus\u0103 testului a fost consolidat\u0103 la o prim\u0103 \u00eenc\u0103rcare de 0,25 kg\/cm2 pentru un interval de 24 de ore, apoi s-a trecut la efectuarea propriu-zis\u0103 a testului de permeabilitate, m\u0103sur\u00e2nd la intervale prestabilite sc\u0103derea nivelului apei \u00een bureta gradat\u0103. Aceast\u0103 procedur\u0103 de testare a fost realizat\u0103 pentru fiecare treapt\u0103 de \u00eenc\u0103rcare, \u00een cazul nostru: 0,25 kg\/cm2, 0,50 kg\/cm2, 1 kg\/cm2, 2 kg\/cm2. Din grafic, se pot ob\u021bine valorile de permeabilitate \u00een m\/s pentru fiecare treapt\u0103 de \u00eenc\u0103rcare aplicat\u0103 \u0219i, prin urmare, pentru fiecare interval de ad\u00e2ncime corespunz\u0103tor.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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\"grafico<\/p>\n

<\/h2>\n

Bibliografie \u0219i Mul\u021bumiri<\/h3>\n

ASTM (1985) – Test designation D4546 – Standard Method for One-Dimensional Swell or Settlement Potential of Cohesive Soils. Vol. 04.08.ASTM Philadelphia, USA.<\/p>\n

BS 1377: Part5 (1990) – Compressibility, Permeability and Durability Tests. Special Report 163, Transportation Research Board, pp.4-12.<\/p>\n

Black D.K. and Lee K.L. (1973) – Saturated Laboratory Samples by Back Pressure. Journal of the Soil Mechanics and Foundations Division, ASCE, Vol.99, n.SM1.<\/p>\n

Mul\u021bumim laboratorului de teste geotehnice I.P.G. di Castrolibero (CS) <\/a>pentru disponibilitatea oferit\u0103 \u00een vederea realiz\u0103rii \u0219i \u00een\u021belegerii analizelor de mai sus \u00eentr-un context practic, \u0219i \u00een special lui S. Soleri pentru explica\u021biile valoroase.<\/p>\n","protected":false},"excerpt":{"rendered":"

Testul de permeabilitate \u00een celula edometric\u0103 are ca scop determinarea coeficientului de permeabilitate K prin aplicarea direct\u0103 a unei presiuni hidraulice variabile \u00een timpul testului edometric. Acest tip de test poate fi efectuat pe probe de sol compuse \u00een principal din loess \u0219i argile , ale c\u0103ror permeabilitate este mai mare de 10-6 – 10-7…<\/p>\n","protected":false},"author":16822,"featured_media":11339,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1595,1969,1443],"tags":[2364,2365,2366,2367],"class_list":["post-11397","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-geologie","category-geotehnica-ro","category-articoli-geotecnica-ro","tag-coeficient-de-permeabilitate","tag-permeabilitate","tag-test-de-permeabilitate-in-celula-edometrica","tag-trepte-de-incarcare","category-1595","category-1969","category-1443","description-off"],"yoast_head":"\nTest de permeabilitate \u00een celul\u0103 edometric\u0103 - Geostru Blog<\/title>\n<meta name=\"description\" content=\"Testul de permeabilitate \u00een celula edometric\u0103: o metod\u0103 pentru determinarea coeficientului de permeabilitate a solurilor.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.geostru.eu\/ro\/test-de-permeabilitate-in-celula-edometrica\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Test de permeabilitate \u00een celul\u0103 edometric\u0103\" \/>\n<meta property=\"og:description\" content=\"Testul de permeabilitate \u00een celula edometric\u0103 are ca scop determinarea coeficientului de permeabilitate K prin aplicarea direct\u0103 a unei presiuni\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.geostru.eu\/ro\/test-de-permeabilitate-in-celula-edometrica\/\" \/>\n<meta property=\"og:site_name\" content=\"Geostru Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/GeoStruSoftware\/\" \/>\n<meta property=\"article:published_time\" content=\"2023-11-14T09:06:56+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-11-23T15:03:49+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blog.geostru.eu\/wp-content\/uploads\/sites\/9\/2023\/11\/prova-di-permeabilita-in-cella-edometrica-1024x538.jpg\" \/>\n<meta name=\"author\" content=\"Gloria Campilongo\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Scris de\" \/>\n\t<meta name=\"twitter:data1\" content=\"Gloria Campilongo\" \/>\n\t<meta name=\"twitter:label2\" content=\"Timp estimat pentru citire\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/blog.geostru.eu\/ro\/test-de-permeabilitate-in-celula-edometrica\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/blog.geostru.eu\/ro\/test-de-permeabilitate-in-celula-edometrica\/\"},\"author\":{\"name\":\"Gloria Campilongo\",\"@id\":\"https:\/\/blog.geostru.eu\/ro\/#\/schema\/person\/efaca837623c7d8e98963bcebcc226bb\"},\"headline\":\"Test de permeabilitate \u00een celul\u0103 edometric\u0103\",\"datePublished\":\"2023-11-14T09:06:56+00:00\",\"dateModified\":\"2023-11-23T15:03:49+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/blog.geostru.eu\/ro\/test-de-permeabilitate-in-celula-edometrica\/\"},\"wordCount\":1234,\"publisher\":{\"@id\":\"https:\/\/blog.geostru.eu\/ro\/#organization\"},\"image\":{\"@id\":\"https:\/\/blog.geostru.eu\/ro\/test-de-permeabilitate-in-celula-edometrica\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blog.geostru.eu\/wp-content\/uploads\/sites\/9\/2023\/11\/copertina-1.png\",\"keywords\":[\"coeficient de permeabilitate\",\"permeabilitate\",\"test de permeabilitate \u00een celula edometric\u0103\",\"trepte de \u00eenc\u0103rcare\"],\"articleSection\":[\"Geologie\",\"Geotehnic\u0103\",\"Inginerie Geotehnic\u0103\"],\"inLanguage\":\"ro-RO\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blog.geostru.eu\/ro\/test-de-permeabilitate-in-celula-edometrica\/\",\"url\":\"https:\/\/blog.geostru.eu\/ro\/test-de-permeabilitate-in-celula-edometrica\/\",\"name\":\"Test de permeabilitate \u00een celul\u0103 edometric\u0103 - 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