{"id":24774,"date":"2016-10-25T15:34:56","date_gmt":"2016-10-25T13:34:56","guid":{"rendered":"https:\/\/www.geostru.eu\/ro\/?p=24774"},"modified":"2017-01-27T16:38:40","modified_gmt":"2017-01-27T14:38:40","slug":"pereti-de-sustinere-conform-np-1242010","status":"publish","type":"post","link":"https:\/\/www.geostru.eu\/ro\/blog\/2016\/10\/25\/pereti-de-sustinere-conform-np-1242010\/","title":{"rendered":"Pereti de sustinere Conform NP 124:2010"},"content":{"rendered":"<h2>Pereti de sustinere Conform NP 124:2010<\/h2>\n<p style=\"text-align: justify;\">Peretii de sustinere a excavatiilor pot fi realizati in functie de importanta lucrarii si de durata acesteia in una dintre urmatoarele variante: sprijiniri simple sau mixte, sprijiniri cu palplanse, pereti ingropati, pereti executati prin jet-grounting.<\/p>\n<p style=\"text-align: justify;\">O excavatie presupune intotdeauna deplasari ale terenului. Alegerea tipului de perete de sustinere si a metodei de construire trebuie sa asigure ca deplasarile si efectele acestora raman in limite stabilite.<\/p>\n<p style=\"text-align: justify;\">Conform <strong>NP 124:2010<\/strong> exista urmatoarele tipuri de cedari:<\/p>\n<ol>\n<li>Cedare in teren a peretului de sustinere<\/li>\n<\/ol>\n<p>Tipuri de cedari la SLU:<\/p>\n<ol style=\"list-style-type: lower-alpha;\">\n<li>Pierderea stabilitatii generale<\/li>\n<li>Cedare rotationala<\/li>\n<li>Cedare verticala<\/li>\n<\/ol>\n<p><a href=\"http:\/\/www.mdlpl.ro\/_documente\/constructii\/reglementari_tehnice\/normativ_lucrari_sustinere.pdf\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-24775 aligncenter\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/P1-300x68.png\" alt=\"p1\" width=\"551\" height=\"125\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/P1-300x68.png 300w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/P1-500x114.png 500w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/P1.png 754w\" sizes=\"(max-width: 551px) 100vw, 551px\" \/><\/a><\/p>\n<p style=\"text-align: center;\"><em>a. Pierderea stabilitatii generale<\/em><\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-24779\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/p2-300x148.png\" alt=\"p2\" width=\"461\" height=\"227\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/p2-300x148.png 300w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/p2-500x246.png 500w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/p2.png 532w\" sizes=\"(max-width: 461px) 100vw, 461px\" \/><\/p>\n<p style=\"text-align: center;\"><em>b. Cedare rotationala<\/em><\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-24783\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/p3.png\" alt=\"p3\" width=\"313\" height=\"191\" \/><\/p>\n<p style=\"text-align: center;\"><em>c.\u00a0 Cedare verticala<\/em><\/p>\n<ol start=\"2\">\n<li>Cedare structurala a peretilor de sustinere<\/li>\n<\/ol>\n<p>Tipuri de cedari structurale ale peretilor de sustinere:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-24791\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/p4-300x80.png\" alt=\"p4\" width=\"549\" height=\"146\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/p4-300x80.png 300w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/p4-500x133.png 500w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/p4.png 672w\" sizes=\"(max-width: 549px) 100vw, 549px\" \/><\/p>\n<p style=\"text-align: center;\"><em>a. Cedarea propriu-zisa a peretelui<\/em><\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-24795\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/p5-300x86.png\" alt=\"p5\" width=\"467\" height=\"134\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/p5-300x86.png 300w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/p5-500x144.png 500w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/p5.png 636w\" sizes=\"(max-width: 467px) 100vw, 467px\" \/><\/p>\n<p style=\"text-align: center;\"><em>b.\u00a0 Cedarea spraiturilor sau a ancorajelor<\/em><\/p>\n<p style=\"text-align: left;\">\u00a0 \u00a0 \u00a0 3. Ruperea hidraulica a terenului<\/p>\n<p style=\"text-align: left;\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-24799 aligncenter\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/p6-300x153.png\" alt=\"p6\" width=\"486\" height=\"248\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/p6-300x153.png 300w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/p6-500x254.png 500w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/p6.png 641w\" sizes=\"(max-width: 486px) 100vw, 486px\" \/><\/p>\n<p style=\"text-align: justify;\"><strong>ACTIUNI SEISMICE<\/strong><\/p>\n<p style=\"text-align: justify;\">In cazul solicitarilor seismice, <strong>NP 124 (Anexa A)<\/strong> precizeaza adaugarea presiunii P<sub>s <\/sub>(presiune seismica) la presiunea masivului de pamant in conditii statice.<\/p>\n<p style=\"text-align: justify;\">Elementul de sustinere este supus unei forte de inertie in directie orizontala:<\/p>\n<p style=\"text-align: center;\">F<sub>i<\/sub> = k<sub>h<\/sub>G<\/p>\n<p>G &#8211; greutatea structurii de sprijin<\/p>\n<p>k<sub>h <\/sub>\u2013 coeficient seismic in directie orizontala<\/p>\n<p style=\"text-align: center;\">k<sub>h<\/sub> = 0.5\u03b3<sub>1<\/sub>(a<sub>g<\/sub>\/g)<\/p>\n<p>a<sub>g <\/sub>\u2013 acceleratia terenului pentru proiectare<\/p>\n<p>g \u2013 acceleratia terenului<\/p>\n<p>\u03b3<sub>1<\/sub> \u2013 clasa de importanta<\/p>\n<p>Conform <strong>SR EN 1997-1:2006<\/strong> abordarile de calcul pentru lucrari de sustinere sunt:<\/p>\n<p><em>ABORDAREA 1<\/em><\/p>\n<p>&#8211; Combinatia 1: (A1+M1+R1)<\/p>\n<p>&#8211; Combinatia 2: (A2+M2+R1)<\/p>\n<p>&nbsp;<\/p>\n<p><em>ABORDAREA 2<\/em><\/p>\n<p>&#8211; Combinatia 1: (A1+M1+R2)<\/p>\n<p>&nbsp;<\/p>\n<p><em>ABORDAREA 3<\/em><\/p>\n<p>&#8211; Combinatia 1: (A1\/A2*+M2+R3)<\/p>\n<p>* coeficientii A1 pentru actiunile de tip structural, A2 pentru cele de tip geotehnic<\/p>\n<p><strong>SR EN 1997-1-NB-2008\u00a0<\/strong>recomanda Abordarea 1 si Abordarea 3<\/p>\n<p><em>Verificarea rezistentei la cedare hidraulica a terenului <\/em><\/p>\n<p style=\"text-align: center;\">u<sub>dst;d<\/sub>\u00a0\u2264\u00a0\u03c3<sub>stb;d<\/sub><\/p>\n<p style=\"text-align: center;\">S<sub>dst;d<\/sub>\u00a0\u2264 G`<sub>stb;d\u00a0<\/sub><\/p>\n<p>u<sub>dst;d <\/sub>&#8211;\u00a0\u00a0valoarea de calcul a presiunii totale destabilizatoare a apei din pori la baza coloanei de pamant<\/p>\n<p>\u03c3<sub>stb;d\u00a0 <\/sub>&#8211;\u00a0\u00a0tensiunea totala verticala stabilizatoare la baza coloanei de pamant<\/p>\n<p>S<sub>dst;d <\/sub>\u00a0&#8211; \u00a0valorea de calcul a fortei curentului in coloana de pamant<\/p>\n<p>G`<sub>stb;d <\/sub>\u00a0&#8211; valoarea de calcul a actiunilor verticale permanente stabilizatoare (greutatea in stare submersata a coloanei de pamant)<\/p>\n<p><em>Verificarile la starile limita de exploatare:<\/em><\/p>\n<p style=\"text-align: center;\">E<sub>d<\/sub>\u00a0\u2264 C<sub>d<\/sub><\/p>\n<p style=\"text-align: left;\">Unde:<\/p>\n<p style=\"text-align: left;\">E<sub>d\u00a0<\/sub>&#8211;\u00a0valoarea de proiectare a efectelor tuturor actiunilor<\/p>\n<p style=\"text-align: left;\">C<sub>d<\/sub> &#8211;\u00a0valoarea limita de proiectare a efectului unei actiuni<\/p>\n<p>Coeficienti partiali pentru verificarea starilor limita pentru structuri (STR) si geotehnice (GEO) conform ANEXEI A a SR EN 1997-1 sunt:<\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<ol>\n<li>Coeficienti partiali pentru actiuni (\u03b3<sub>F<\/sub>) sau efecte ale actiunilor (\u03b3<sub>E<\/sub>)<\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-24672 aligncenter\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m6-300x120.png\" alt=\"m6\" width=\"451\" height=\"180\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m6-300x120.png 300w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m6-500x200.png 500w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m6.png 628w\" sizes=\"(max-width: 451px) 100vw, 451px\" \/><\/p>\n<p style=\"text-align: center;\"><em>Tabelul 1: Coeficienti partiali pentru actiuni (\u03b3<sub>F<\/sub>) sau efecte ale actiunilor (\u03b3<sub>E<\/sub>)<\/em><\/p>\n<p>\u03b3<sub>G\u00a0<\/sub>&#8211; pentru actiunile permanente defavorabile sau favorabile<\/p>\n<p>\u03b3<sub>Q<\/sub><sub>\u00a0<\/sub>&#8211; pentru actiunile variabile\u00a0defavorabile sau favorabile<\/p>\n<p>&nbsp;<\/p>\n<p>2. Coeficienti partiali pentru parametrii pamantului (\u03b3<sub>M<\/sub>)<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-24680 aligncenter\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m8-300x159.png\" alt=\"m8\" width=\"422\" height=\"224\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m8-300x159.png 300w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m8-500x265.png 500w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m8.png 665w\" sizes=\"(max-width: 422px) 100vw, 422px\" \/><\/p>\n<p style=\"text-align: center;\"><em>Tabelul 2: Coeficienti partiali pentru parametrii pamantului (\u03b3<sub>M<\/sub>)<\/em><\/p>\n<p style=\"text-align: left;\">\u03b3<sub>\u03c6`<\/sub> &#8211; pentru tangenta unghiului de frecare interna<\/p>\n<p style=\"text-align: left;\">\u03b3<sub>c`<\/sub>\u00a0&#8211; pentru\u00a0coeziunea efectiva (drenata)<\/p>\n<p style=\"text-align: left;\">\u03b3<sub>cu<\/sub>\u00a0&#8211; pentru\u00a0coeziunea\u00a0nedrenata<\/p>\n<p style=\"text-align: left;\">\u03b3<sub>qu<\/sub>\u00a0&#8211; pentru\u00a0rezistenta la compresiune cu deformare laterala libera<\/p>\n<p style=\"text-align: left;\">\u03b3<sub>\u03b3<\/sub>\u00a0&#8211; pentru greutatea volumica<\/p>\n<p style=\"text-align: left;\">\u00a0 \u00a0 \u00a0 3. Coeficienti partiali de rezistenta (\u03b3<sub>R<\/sub>)<\/p>\n<p style=\"text-align: left;\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-24686 aligncenter\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m9-300x102.png\" alt=\"m9\" width=\"464\" height=\"158\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m9-300x102.png 300w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m9-500x170.png 500w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m9.png 660w\" sizes=\"(max-width: 464px) 100vw, 464px\" \/><\/p>\n<p style=\"text-align: center;\"><em>Tabelul 3: Coeficienti partiali de rezistenta (\u03b3<sub>R<\/sub>) pentru lucrari de sustinere<\/em><\/p>\n<p style=\"text-align: left;\">\u03b3<sub>R;v<\/sub> &#8211; pentru rezistenta la capacitate portanta<\/p>\n<p style=\"text-align: left;\">\u03b3<sub>R;h<\/sub>\u00a0&#8211; pentru rezistenta la alunecare<\/p>\n<p style=\"text-align: left;\">\u03b3<sub>R;e<\/sub>\u00a0&#8211; pentru rezistenta pamantului<\/p>\n<p>Coeficienti partiali pentru verificarea la starea limita de rupere hidraulica locala sau eroziune (HYD)<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-24837 aligncenter\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/p7-300x220.png\" alt=\"p7\" width=\"350\" height=\"257\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/p7-300x220.png 300w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/p7.png 456w\" sizes=\"(max-width: 350px) 100vw, 350px\" \/><\/p>\n<p style=\"text-align: center;\"><em>Tabelul 4: Coeficienti partiali pentru actiuni (\u03b3<sub>F<\/sub>)<\/em><\/p>\n<p style=\"text-align: left;\">\u03b3<sub>G;dst<\/sub> &#8211; pentru actiunile permanente defavorabile destabilizatoare<\/p>\n<p style=\"text-align: left;\">\u03b3<sub>G;stb<\/sub> &#8211; pentru actiunile permanente favorabile stabilizatoare<\/p>\n<p style=\"text-align: left;\">\u03b3<sub>Q<\/sub><sub>;stb<\/sub> &#8211; pentru actiunile temporare defavorabile destabilizatoare<\/p>\n<p>Conform <strong>SR EN 1997-1\/NB-2007<\/strong> \u00a0coeficientii partiali pentru stari limita de exploatare normala se adopta cu valoarea 1,00.<\/p>\n<p style=\"text-align: justify;\"><a href=\"https:\/\/www.geostru.eu\/ro\/shop\/geotehnica-si-geologie\/sprijiniri-pereti-mulati-palplanse\/\" target=\"_blank\"><strong>SPW<\/strong><\/a><strong> &#8211; <\/strong>Software pentru proiectarea si calculul lucrarilor de sustinere de tip pereti mulati, palplanse (metalice, din lemn sau din ciment armat), pereti din piloti sau micropiloti forati.\u00a0Metodele de calcul utilizate sunt: Echilibrul limita, Elemente finite.<br \/>\nMetodele amintite au o complexitate crescuta atat din punct de vedere numeric, cat si din punct de vedere al calitatii parametrilor geotehnici necesari calculului.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pereti de sustinere Conform NP 124:2010 Peretii de sustinere a excavatiilor pot fi realizati in functie de importanta lucrarii si de durata acesteia in una dintre urmatoarele variante: sprijiniri simple sau mixte, sprijiniri cu palplanse, pereti ingropati, pereti executati prin jet-grounting. O excavatie presupune intotdeauna deplasari ale terenului. Alegerea tipului de perete de sustinere si&hellip;<\/p>\n","protected":false},"author":216,"featured_media":27573,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[592,591],"tags":[632],"class_list":["post-24774","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articole-geotehnic","category-articole-pentru-geologie","tag-pereti-de-sustinere","category-592","category-591","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>Pereti de sustinere Conform NP 124:2010 - GeoStru EU<\/title>\n<meta name=\"description\" content=\"Pereti de sustinere Conform NP 124:2010. 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