{"id":107666,"date":"2023-01-16T16:27:00","date_gmt":"2023-01-16T15:27:00","guid":{"rendered":"https:\/\/www.geostru.eu\/?p=107666"},"modified":"2023-02-09T14:26:01","modified_gmt":"2023-02-09T13:26:01","slug":"elaborarea-studiului-geotehnic-conform-eurocod-7","status":"publish","type":"post","link":"https:\/\/www.geostru.eu\/ro\/blog\/2023\/01\/16\/elaborarea-studiului-geotehnic-conform-eurocod-7\/","title":{"rendered":"Elaborarea studiului geotehnic cu geostru conform Eurocod 7"},"content":{"rendered":"<p>Studiul geotehnic reprezint\u0103 documenta\u021bia geotehnic\u0103 de baz\u0103 utilizat\u0103 \u00een practica de proiectare geotehnic\u0103 din \u021bara noastr\u0103, iar in SR EN 1997-2 poart\u0103 numele de \u201e<em>Raport privind investigarea terenului\u201d.<\/em><\/p>\n<p>Un studiu geotehnic trebuie s\u0103 cuprind\u0103 dou\u0103 capitole principale:<\/p>\n<p>a) prezentarea informa\u021biilor geotehnice<\/p>\n<p>b) evaluarea informa\u021biilor geotehice<\/p>\n<p>Conform NP 074, studiile geotehnice corelate cu etapele de proiectare se clasific\u0103 dup\u0103 cum urmeaz\u0103:<\/p>\n<ul>\n<li>Studiu geotehnic preliminar (SG-P) pentru studiul de prefezabilitate al lucr\u0103rii<\/li>\n<li>Studiu geotehnic (SG) pentru studiul de fezabilitate al lucr\u0103rii sau pentru proiectul tehnic (P.Th.), parte a D.T.A.C.<\/li>\n<li>Studiu geotehnic pentru proiect \u00een faza unic\u0103 (SG-U)<\/li>\n<li>Studiu geotehnic de detaliu (SG-D) pentru proiectarea la faza de detalii deexecu\u021bie (D.E.)<\/li>\n<\/ul>\n<p>Indiferent de faza de proiectare c\u0103reia i se adreseaz\u0103, este obligatoriu ca studiul geotehnic s\u0103 fie verificat de c\u0103tre un verificator de proiecte atestat \u00een domeniul A<sub>f<\/sub>.<\/p>\n<p><strong>Etapele elabor\u0103rii studiului geotehnic<\/strong><\/p>\n<ol>\n<li>Analizarea cererii clientului;<\/li>\n<li>Planificarea si efectuarea investig\u0103rii terenului: Definirea volumului investig\u0103rii terenului care va cuprinde, \u00een func\u021bie de categoria geotehnic\u0103:<\/li>\n<\/ol>\n<p>&#8211; foraje \u0219i\/sau sondaje deschise cu prelevare de e\u0219antioane <sup>*<\/sup><\/p>\n<p>&#8211; sondaje deschise pentru \u00eentocmirea de relevee \u0219i descrierea funda\u021biilor cl\u0103dirilor vecine, aflate la limita de proprietate<\/p>\n<p>&#8211; \u00eencerc\u0103ri \u00een laborator pe probe de p\u0103m\u00e2nt <sup>**<\/sup><\/p>\n<p>&#8211; \u00eencerc\u0103ri \u00een laborator pe probe de roc\u0103 <sup>**<\/sup><\/p>\n<p>&#8211; \u00eencerc\u0103ri pe teren<\/p>\n<p>&#8211; m\u0103sur\u0103tori ale nivelului hidrostatic<\/p>\n<p>&#8211; analize chimice privind efectul apei subterane \u0219i a p\u0103m\u00e2nturilor asupra materialelor de construc\u021bie.<\/p>\n<ol start=\"3\">\n<li>Elaborarea studiului geotehnic, care va cuprinde:<\/li>\n<\/ol>\n<p>&#8211; date generale.;<\/p>\n<p>&#8211; prezentarea informa\u021biilor geotehnice;<\/p>\n<p>&#8211; evaluarea informa\u021biilor geotehnice;<\/p>\n<p>&#8211; \u00eencadrarea diferitelor lucr\u0103ri \u00een categoriile geotehnice;<\/p>\n<p>&#8211; recomand\u0103ri privind sistemul de fundare.<\/p>\n<p><sup>*<\/sup><span style=\"font-size: 8pt\"> \u00cen conformitate cu SR EN ISO 22475-1, esantionul se defineste drept \u201eo cantitate definit\u0103 de roc\u0103, p\u0103m\u00e2nt sau ap\u0103 subteran\u0103 prelevat\u0103 de la o ad\u00e2ncime stabilit\u0103\u201d.<\/span><\/p>\n<p><sup>** <\/sup><span style=\"font-size: 8pt\">Probele de p\u0103m\u00e2nt sau roc\u0103 se preg\u0103tesc din esantioanele prelevate pe teren, \u00een vederea efectu\u0103rii unei \u00eencerc\u0103ri \u00een laborator, \u00een conformitate cu cerin\u021bele specificate pentru \u00eencercarea respectiv\u0103.<\/span><\/p>\n<p style=\"text-align: center\"><strong>Elemente ale proiect\u0103rii geotehnice definite \u00een SR EN 1997-1 \u0219i aplicate \u00een normativele din \u021bara noastr\u0103<\/strong><\/p>\n<p>Se recunosc, conform SR EN 1990:2002, dou\u0103 tipuri de st\u0103ri limit\u0103:<\/p>\n<ul>\n<li>st\u0103ri limit\u0103 ultime (SLU)<\/li>\n<li>st\u0103ri limit\u0103 de exploatare (SLE)<\/li>\n<\/ul>\n<p><strong>St\u0103rile limit\u0103 ultime<\/strong> sunt cele care au \u00een vedere siguran\u021ba oamenilor si a construc\u021biilor si sunt asociate cu pr\u0103busirea sau alte forme similare de cedare structural\u0103.<\/p>\n<p><strong>St\u0103rile limt\u0103 de exploatare<\/strong> sunt cele care au \u00een vedere exploatarea normal\u0103 si confortul oamenilor, corespunz\u00e2nd stadiilor dincolo de care \u00eenceteaz\u0103 a mai fi \u00eendeplinite cerin\u021bele puse de exploatarea construc\u021biei \u00een ansamblu sau a unei p\u0103r\u021bi din construc\u021bie.<\/p>\n<p>Mai departe sunt prezentate trei exemple in care starile limita sunt induse de comportarea terenului de fundare.<\/p>\n<p>A. SLU a unei structuri in cadre fundat\u0103 pe radier este atinsa\u0103 prin cedarea terenului de fundare.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-107667 aligncenter\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2019\/08\/A-SLU-300x128.jpg\" alt=\"\" width=\"300\" height=\"128\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2019\/08\/A-SLU-300x128.jpg 300w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2019\/08\/A-SLU.jpg 495w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>B. SLU a aceleia\u0219i structuri, av\u00e2nd \u00eens\u0103 funda\u021bii izolate sub st\u00e2lpi, se produce pe seama unor tasari diferen\u021biale excesive, produse, de pild\u021b, prin prezen\u021ba unei pungi de p\u0103m\u00e2nt foarte compresibil sub unul din st\u00e2lpi, neidentificat\u0103 la investigarea terenului de fundare.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-107671 aligncenter\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2019\/08\/B-SLU-300x178.jpg\" alt=\"\" width=\"300\" height=\"178\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2019\/08\/B-SLU-300x178.jpg 300w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2019\/08\/B-SLU.jpg 415w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>C. SLE a halei cu o deschidere este atins\u0103 \u00een situa\u021bia \u00een care tasarea diferen\u021bial\u0219 mare \u00eempiedic\u0103 func\u021bionarea podurilor rulante cu care este echipat\u0103 hala. \u00centruc\u00e2t hala reprezint\u0103 un sistem static determinat, tasarea diferen\u021bial\u0103 nu este de natur\u0103 s\u0103 induc\u0103 o SLU \u00een structur\u0103, precum la exemplul precedent.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-107675 aligncenter\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2019\/08\/C-SLE-300x126.jpg\" alt=\"\" width=\"300\" height=\"126\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2019\/08\/C-SLE-300x126.jpg 300w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2019\/08\/C-SLE.jpg 434w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><strong>Situa\u021bii de proiectare<\/strong><\/p>\n<p><strong>\u00a0<\/strong>SR EN 1997-1 impune luarea \u00een considerare \u00een proiectarea geotehnic\u0103 a asa numitelor situa\u021bii de proiectare, care trebuie astfel alese \u00eenc\u00e2t s\u0103 acopere toate condi\u021biile care pot ap\u0103rea pe parcursul execu\u021biei si exploat\u0103rii construc\u021biilor.<\/p>\n<p>Trebuie avute \u00een vedere situa\u021biile de proiectare pe termen scurt si pe termen lung.<\/p>\n<p>Un criteriu principal pentru luarea \u00een considerare a factorului timp \u00een definirea situa\u021biei de proiectare \u00eel reprezint\u0103 permeabilitatea p\u0103m\u00e2ntului.<\/p>\n<p>La situa\u021biile de proiectare pe termen scurt, condi\u021biile nedrenate vor fi hot\u0103r\u00e2toare \u00een cazul p\u0103m\u00e2nturilor argiloase, de consisten\u021b\u0103 redus\u0103 sau medie, deoarece disiparea \u00een timp a presiunii apei din pori este \u00eenso\u021bit\u0103 de o cre\u0219tere a rezisten\u021bei la forfecare a p\u0103m\u00e2ntului.<\/p>\n<ul>\n<li><strong>Proiectarea geotehnic\u0103 prin calcul<\/strong><\/li>\n<\/ul>\n<p>Factorii care intervin \u00een proiectarea geotehnic\u0103 prin calcul sunt:<\/p>\n<p>&#8211; ac\u021biunile, care pot fi \u00eenc\u0103rc\u0103ri impuse sau deplas\u0103ri impuse;<\/p>\n<p>&#8211; propriet\u0103\u021bile p\u0103m\u00e2nturilor si rocilor care alc\u0103tuiesc terenul de fundare, precum \u0219i propriet\u0103\u021bile materialelor de construc\u021bie;<\/p>\n<p>&#8211; valorile limit\u0103 ale deforma\u021biilor, deschiderii fisurilor, vibra\u021biilor etc;<\/p>\n<p>&#8211; modelele de calcul asociate cu st\u0103rile limit\u0103 ultime si de exploatare, \u00een m\u0103sur\u0103 s\u0103 anticipeze efectul ac\u021biunilor asupra rezisten\u021bei si deforma\u021biei terenului, corespunz\u00e2nd cu diferitele situa\u021bii de proiectare.<\/p>\n<p>Proiectarea geotehnic\u0103 prin calcul reprezint\u0103 metoda de proiectare curent utilizat\u0103.<\/p>\n<p>Totusi, SR EN 1997-1 atrage aten\u021bia proiectantului asupra faptului c\u0103 recunoa\u0219terea condi\u021biilor de teren depinde de volumul \u0219i de calitatea investig\u0103rii terenului de fundare. Controlul calit\u0103\u021bii execu\u021biei lucr\u0103rilor \u0219i recunoa\u0219terea condi\u021biilor de teren, sunt mai importante pentru satifacerea cerin\u021belor fundamentale dec\u00e2t precizia \u00een modelele de calcul \u0219i \u00een coeficien\u021bii par\u021biali.<\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<ul>\n<li><strong>SLU<\/strong><\/li>\n<\/ul>\n<p>SR EN 1997-1 deosebeste cinci tipuri diferite de st\u0103ri limit\u0103 ultime pentru care se folosesc denumirile prescurtate date \u00een SR EN 1990:<\/p>\n<p>&#8211; pierderea echilibrului structurii sau terenului considerat ca un corp rigid, \u00eencare rezisten\u021bele materialelor structurii si ale terenului nu aduc o contribu\u021bie important\u0103 la asigurarea rezisten\u021bei (EQU)<\/p>\n<p>(\u00cen figura urm\u0103toare, se prezint\u0103 un zid de sprijin de greutate fundat pe st\u00e2nc\u0103. R\u0103sturnarea zidului sub efectul \u00eempingerii p\u0103m\u00e2ntului este o stare limit\u0103 ultim\u0103 de tip EQU.)<\/p>\n<p>&#8211; cedarea intern\u0103 sau deforma\u021bia excesiv\u0103 a structurii sau elementelor de structur\u0103, cum sunt de exemplu t\u0103lpile de funda\u021bii, pilo\u021bii sau pere\u021bii de subsol, \u00een care rezisten\u021ba materialelor contribuie semnificativ la asigurarea rezisten\u021bei (STR);<\/p>\n<p>&#8211; cedarea sau deforma\u021bia excesiv\u0103 a terenului, \u00een care rezisten\u021ba p\u0103m\u00e2nturior sau a rocilor contribuie \u00een mod semnificativ la asigurarea rezisten\u021bei (GEO);<\/p>\n<p>&#8211; pierderea echilibrului structurii sau a terenului provocat\u0103 de subpresiunea apei (presiunea arhimedic\u0103) sau de alte ac\u021biuni verticale (UPL);<\/p>\n<p>&#8211; cedarea hidraulic\u0103 a terenului, eroziunea intern\u0103 \u0219i eroziunea regresiv\u0103, sub efectul gradien\u021bilor hidraulici (HYD).\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 \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<img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-107679 aligncenter\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2019\/08\/fig-4-SLU-300x162.jpg\" alt=\"\" width=\"300\" height=\"162\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2019\/08\/fig-4-SLU-300x162.jpg 300w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2019\/08\/fig-4-SLU.jpg 471w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><span style=\"font-size: 8pt\">\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 \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 \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<\/span><\/p>\n<p><strong>Coeficien\u021bii par\u021biali pentru st\u0103rile limit\u0103 STR si GEO<\/strong><\/p>\n<p>Utilizarea unor coeficien\u021bi de siguran\u021b\u0103 diferen\u021bia\u021bi reprezint\u0103 una dintre caracteristicile principale ale metodei semi-probabilistice la st\u0103ri limit\u0103, care st\u0103 la baza sistemului de Eurocoduri pentru structuri.<\/p>\n<p>Pentru st\u0103rile limit\u0103 <strong>STR<\/strong> \u0219i <strong>GEO<\/strong> sunt utilizate trei grupe de coeficien\u021bi par\u021biali:<\/p>\n<p>&#8211; pentru ac\u021biuni (\u03b3<sub>F<\/sub>) \u0219i efectele ac\u021biunilor (\u03b3<sub>E<\/sub>)<\/p>\n<p>&#8211; pentru parametrii p\u0103m\u00e2ntului (\u03b3<sub>M<\/sub>)<\/p>\n<p>&#8211; pentru rezisten&gt;e (\u03b3<sub>R<\/sub>)<\/p>\n<p>Pentru fiecare din cele trei grupe, se definesc coeficien\u021bi par\u021biali:<\/p>\n<ul>\n<li>la \u03b3<sub>F<\/sub> si \u03b3<sub>E<\/sub> \u00een func\u021bie de natura ac\u021biunilor (permanente sau variabile)<\/li>\n<li>la \u03b3<sub>M<\/sub> \u00een func\u021bie de parametrul geotehnic<\/li>\n<li>la \u03b3<sub>R<\/sub> \u00een func\u021bie de structura geotehnic\u0103 la care se aplic\u0103 (funda\u021bie de suprafa\u021b\u0103, pilot, ancoraj \u00een teren, terasament, taluz).<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Studiul geotehnic reprezint\u0103 documenta\u021bia geotehnic\u0103 de baz\u0103 utilizat\u0103 \u00een practica de proiectare geotehnic\u0103 din \u021bara noastr\u0103, iar in SR EN 1997-2 poart\u0103 numele de \u201eRaport privind investigarea terenului\u201d. Un studiu geotehnic trebuie s\u0103 cuprind\u0103 dou\u0103 capitole principale: a) prezentarea informa\u021biilor geotehnice b) evaluarea informa\u021biilor geotehice Conform NP 074, studiile geotehnice corelate cu etapele de proiectare&hellip;<\/p>\n","protected":false},"author":14761,"featured_media":112486,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[592,591,4749,589,644,861,80,4764],"tags":[],"class_list":["post-107666","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articole-geotehnic","category-articole-pentru-geologie","category-general-ro","category-inginerie-civila","category-news-ro","category-pubblicazioni-ro","category-publicatii","category-varie-ro","category-592","category-591","category-4749","category-589","category-644","category-861","category-80","category-4764","description-off"],"yoast_head":"<!-- This site is optimized with the 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