{"id":83855,"date":"2018-06-15T12:12:29","date_gmt":"2018-06-15T10:12:29","guid":{"rendered":"https:\/\/www.geostru.eu\/?p=83855"},"modified":"2018-06-15T12:12:29","modified_gmt":"2018-06-15T10:12:29","slug":"tehnicile-seismice-pasive","status":"publish","type":"post","link":"https:\/\/www.geostru.eu\/ro\/blog\/2018\/06\/15\/tehnicile-seismice-pasive\/","title":{"rendered":"Tehnicile seismice pasive"},"content":{"rendered":"<p style=\"text-align: justify;\">Tehnicile seismice pasive vizeaz\u0103 definirea propriet\u0103\u021bilor mecanice ale subsolului pornind de la m\u0103sur\u0103torile c\u00e2mpului vibra\u021biilor de mediu generate de surse necontrolate de diferite tipuri. Zgomotul ambiental prin natura sa are o tendin\u021b\u0103 foarte neregulat\u0103.<\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-80725 aligncenter\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2018\/05\/hvsr_1-1-300x202.png\" alt=\"\" width=\"503\" height=\"339\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2018\/05\/hvsr_1-1-300x202.png 300w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2018\/05\/hvsr_1-1-500x337.png 500w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2018\/05\/hvsr_1-1-768x518.png 768w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2018\/05\/hvsr_1-1.png 897w\" sizes=\"(max-width: 503px) 100vw, 503px\" \/><\/p>\n<p style=\"text-align: justify;\">Metodele seismice pasive se bazeaz\u0103 pe observarea unui c\u00e2mp de und\u0103 legat fizic de cel generat de cutremur. Avantajul acestor tehnici este acela c\u0103 undele seismice utilizate sunt caracterizate prin lungimi de und\u0103 \u0219i ad\u00e2ncimi de propagare mult mai mari dec\u00e2t cele generate artificial, ceea ce permite atingerea ad\u00e2ncimilor de explorare mult mai mari dec\u00e2t cele realizabile cu ajutorul tehnicilor seismice active, \u00een detrimentul unei rezolu\u021bii spa\u021biale mai grave \u0219i al unei interpret\u0103ri dificile.<\/p>\n<p style=\"text-align: justify;\">Ele pot func\u021biona \u00eentr-un mediu urban, chiar \u0219i \u00een prezen\u021ba unor tulbur\u0103ri antropice puternice. Tehnica seismic\u0103 pasiv\u0103 univitiv\u0103 (raportul spectral H \/ V sau HVSR &#8211; Tehnica Spectral\u0103 orizontal\u0103 p\u00e2n\u0103 la Vertical\u0103) s-a r\u0103sp\u00e2ndit rapid \u00een ultimii ani, deoarece este complet neinvaziv\u0103, foarte rapid\u0103, aplicabil\u0103 pretutindeni, costuri reduse, nu necesit\u0103 nici foraj, nici energii externe, altele dec\u00e2t zgomotul ambiental, care, \u00een natur\u0103, exist\u0103 peste tot.<\/p>\n<p style=\"text-align: justify;\">\u00cen principiu, aceasta este o m\u0103sur\u0103 simpl\u0103 care necesit\u0103 un singur operator. De fapt, este vorba despre m\u0103surarea cu un seismometru cu trei componente (tromograf digital) a vibra\u021biilor de mediu prezente \u00eentr-un punct timp de c\u00e2teva minute \u0219i apoi a construi o curb\u0103 reprezentativ\u0103 a rapoartelor spectrale (H \/ V) \u00een func\u021bie de frecven\u021ba vibra\u021biilor. Orice maxime vor fi indicative pentru posibila prezen\u021b\u0103 a fenomenelor de rezonan\u021b\u0103.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-80721 size-full aligncenter\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2018\/05\/hvs_02.png\" alt=\"\" width=\"700\" height=\"214\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2018\/05\/hvs_02.png 700w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2018\/05\/hvs_02-500x153.png 500w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2018\/05\/hvs_02-300x92.png 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/p>\n<p><strong>Principalele domenii de aplicare se refer\u0103 la:<\/strong><\/p>\n<p style=\"text-align: justify;\">analiza pentru definirea ac\u021biunii seismice a proiectului \u00een faza de execu\u021bie a interven\u021biilor directe \u00een construc\u021bii. studii de microzonare seismic\u0103 \u00een sprijinul instrumentelor generale de planificare urban\u0103 \u00een faza de planificare teritorial\u0103 \u0219i urban\u0103; Tehnica HVSR este utilizat\u0103 pentru: 1. determina frecven\u021ba fundamental\u0103 a rezonan\u021bei subterane. Acesta este un parametru foarte important atunci c\u00e2nd a analizat, \u00eempreun\u0103 cu frecven\u021bele naturale ale lucr\u0103rilor care vor c\u0103dea peste, deoarece, \u00een caz de coinciden\u021b\u0103 a celor dou\u0103 frecven\u021be poate s\u0103 apar\u0103 fenomenul de \u201erezonan\u021b\u0103 dubl\u0103\u201c, extrem de periculos pentru instala\u021bii, care ar fi supuse excita\u021bii nesuportabile. 2. s\u0103 efectueze investiga\u021bii stratigrafice ale subsolului; scopurile HVSR stratigrafice pot fi folosite pentru a identifica punctele cele mai preliminar reprezentative \u00een care af\u00e2narea anchetei cu tehnici clasice punctuale sau pentru a verifica, \u00een cazul \u00een care\u00a0\fexist\u0103 deja alte studii specifice, eterogenitatea semnificative \u00een jurul punctelor investigate sau \u00eenc\u0103 un element de sus\u021binere alte investiga\u021bii dac\u0103 prezint\u0103 \u00eendoieli interpretative; 3. estimarea valorii VS \u0219i q \u00een prezen\u021ba unei constr\u00e2ngeri, \u0219i anume ad\u00e2ncimea unui reflector, mai mic\u0103 de 30 m, care recunoa\u0219te marcatorul \u00een H curba V \/ sau VS, 30 dac\u0103 ad\u00e2ncimea reflectorului este mai mare la 30 m de estimarea VS a stratului de suprafa\u021b\u0103.<\/p>\n<p style=\"text-align: justify;\"><a href=\"https:\/\/www.geostru.eu\/ro\/shop\/software-ro\/geofizica\/easy-hvsr-software-hvsr-processing\/\">Easy HVSR<\/a> este software-ul Geostru pentru analiza raportului spectral al microtremorilor cu \u00eenregistr\u0103ri cu o singur\u0103 sta\u021bie. Este foarte apreciat pentru simplitatea utiliz\u0103rii \u0219i viteza de execu\u021bie a calculelor. Programul este \u00een concordan\u021b\u0103 cu directivele sugerate de proiectul SESAME.<\/p>\n<p style=\"text-align: justify;\">\n","protected":false},"excerpt":{"rendered":"<p>Tehnicile seismice pasive vizeaz\u0103 definirea propriet\u0103\u021bilor mecanice ale subsolului pornind de la m\u0103sur\u0103torile c\u00e2mpului vibra\u021biilor de mediu generate de surse necontrolate de diferite tipuri. Zgomotul ambiental prin natura sa are o tendin\u021b\u0103 foarte neregulat\u0103. Metodele seismice pasive se bazeaz\u0103 pe observarea unui c\u00e2mp de und\u0103 legat fizic de cel generat de cutremur. Avantajul acestor tehnici&hellip;<\/p>\n","protected":false},"author":216,"featured_media":80736,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[592,591,644],"tags":[3074],"class_list":["post-83855","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articole-geotehnic","category-articole-pentru-geologie","category-news-ro","tag-tehnicile-seismice-pasive","category-592","category-591","category-644","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>Tehnicile seismice pasive<\/title>\n<meta name=\"description\" content=\"Tehnicile seismice pasive vizeaz\u0103 definirea propriet\u0103\u021bilor mecanice ale subsolului pornind de la m\u0103sur\u0103torile c\u00e2mpului vibra\u021biilor de mediu generate de surse necontrolate de diferite tipuri. 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He graduated in Civil Engineering, geotechnical track, at the University of Calabria in 1996, with a thesis entitled \\\"Programma di calcolo per l'analisi della stabilita dei pendii con metodi numerici avanzati\\\" (A calculation program for slope stability analysis using advanced numerical methods) - the work that became his first commercial product. He has been registered with the Order of Engineers of Reggio Calabria (no. 1839) since 1996. From 1996 to 1999 he worked as an analyst and software developer specialising in numerical algorithms, in Pascal, Visual Basic, Fortran and Visual C++, and in full-stack web development. He works with advanced 2D and 3D mathematical models and with graphics programming in OpenGL and DirectX. In 1999 he founded GeoStru, an international geotechnical software house whose catalogue he largely authored: slope stability and rockfall analysis, foundations and retaining structures, finite element analysis, geophysics and site investigation, hydrology and hydrogeology, and reinforced concrete design. Since 2016 he has run SC Engsoft S.r.l. in Cluj-Napoca, Romania, and he is technical and scientific consultant to GoMeeting. His most recent work is GeoStru.ai, a platform delivering geotechnical and civil calculation through natural-language conversation while keeping the analysis itself on deterministic, auditable algorithms. Between 2005 and 2013 he co-supervised degree theses at the University of Calabria and the Mediterranea University of Reggio Calabria. He teaches accredited professional-development courses for geologists and engineers under accreditation from the Italian Consiglio Nazionale dei Geologi. His peer-reviewed work includes papers in Green World Journal (2021), Marine and Petroleum Geology (2022), Journal of Mediterranean Earth Sciences (2022), Geosciences (2024) and Bulletin of Engineering Geology and the Environment (2026), together with memorie at the XXVII and XXVIII Italian National Geotechnical Conferences. He co-authored \\\"Terre rinforzate\\\" (EPC Editore, 2023) and \\\"Terrae Motus\\\". He has been a member of AGI, ISRM, ISSMGE and AGI-IGS since 2014, and holds a certificate from AGS (Association of Geotechnical &amp; Geoenvironmental Specialists). 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He graduated in Civil Engineering, geotechnical track, at the University of Calabria in 1996, with a thesis entitled \"Programma di calcolo per l'analisi della stabilita dei pendii con metodi numerici avanzati\" (A calculation program for slope stability analysis using advanced numerical methods) - the work that became his first commercial product. He has been registered with the Order of Engineers of Reggio Calabria (no. 1839) since 1996. From 1996 to 1999 he worked as an analyst and software developer specialising in numerical algorithms, in Pascal, Visual Basic, Fortran and Visual C++, and in full-stack web development. He works with advanced 2D and 3D mathematical models and with graphics programming in OpenGL and DirectX. In 1999 he founded GeoStru, an international geotechnical software house whose catalogue he largely authored: slope stability and rockfall analysis, foundations and retaining structures, finite element analysis, geophysics and site investigation, hydrology and hydrogeology, and reinforced concrete design. Since 2016 he has run SC Engsoft S.r.l. in Cluj-Napoca, Romania, and he is technical and scientific consultant to GoMeeting. His most recent work is GeoStru.ai, a platform delivering geotechnical and civil calculation through natural-language conversation while keeping the analysis itself on deterministic, auditable algorithms. Between 2005 and 2013 he co-supervised degree theses at the University of Calabria and the Mediterranea University of Reggio Calabria. He teaches accredited professional-development courses for geologists and engineers under accreditation from the Italian Consiglio Nazionale dei Geologi. His peer-reviewed work includes papers in Green World Journal (2021), Marine and Petroleum Geology (2022), Journal of Mediterranean Earth Sciences (2022), Geosciences (2024) and Bulletin of Engineering Geology and the Environment (2026), together with memorie at the XXVII and XXVIII Italian National Geotechnical Conferences. He co-authored \"Terre rinforzate\" (EPC Editore, 2023) and \"Terrae Motus\". He has been a member of AGI, ISRM, ISSMGE and AGI-IGS since 2014, and holds a certificate from AGS (Association of Geotechnical &amp; Geoenvironmental Specialists). 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