{"id":14567,"date":"2022-04-02T17:38:45","date_gmt":"2022-04-02T15:38:45","guid":{"rendered":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/?p=14567"},"modified":"2022-04-04T09:57:34","modified_gmt":"2022-04-04T07:57:34","slug":"linstitut-olorda-explora-les-escletxes-del-papiol","status":"publish","type":"post","link":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/general\/linstitut-olorda-explora-les-escletxes-del-papiol\/","title":{"rendered":"L&#8217;Institut Olorda explora les Escletxes del Papiol"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-14571\" src=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2022\/04\/olorda2_p.jpg\" alt=\"\" width=\"300\" height=\"155\" \/>El dia 1 d&#8217;abril, els nois i noies de l&#8217;optativa de <strong>biologia i geologia<\/strong> de 4t d&#8217;ESO de l&#8217;<a href=\"http:\/\/iesolorda.cat\/\">Institut Olorda<\/a> de Sant Feliu de Llobregat, han anat a explorar <a href=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/ambits\/geologia\/les-escletxes-i-els-riscs-geologics\/\">Les Escletxes<\/a> del Papiol acompanyats pel <a href=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/\">Camp d&#8217;aprenentatge Can Santoi<\/a>. Conjuntament ens hem situat geogr\u00e0ficament el lloc i, despr\u00e9s d&#8217;haver vist les primeres escletxes, hem plantejat l&#8217;activitat com a una recerca basada en evid\u00e8ncies. Han sorgit dues hip\u00f2tesis: &#8220;<strong>les escletxes s&#8217;han originat a causa de fen\u00f2mens meteorol\u00f2gics erosius<\/strong>&#8221; i &#8220;<strong>les escletxes s&#8217;han produ\u00eft per efecte de la tect\u00f2nica de plaques<\/strong>&#8220;.<\/p>\n<p>A partir d&#8217;aquestes hip\u00f2tesis, han dedicat especial atenci\u00f3 a <strong>identificar les propietats<\/strong> dels materials sedimentaris inferiors, les argiles. Han comprovat la plasticitat en pres\u00e8ncia d&#8217;aigua. Els estrats superiors, formats per calc\u00e0ries fossil\u00edferes, que a escala micro s\u00f3n impermeables, per\u00f2 a escala meso i macro estan plens de forats i d&#8217;esquerdes verticals. Aquestes esquerdes s\u00ed que poden conduir les aig\u00fces pluvials cap als estrats inferiors argilosos.<img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-14572\" src=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2022\/04\/olorda3_p-194x300.jpg\" alt=\"\" width=\"194\" height=\"300\" srcset=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2022\/04\/olorda3_p-194x300.jpg 194w, https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2022\/04\/olorda3_p.jpg 300w\" sizes=\"auto, (max-width: 194px) 100vw, 194px\" \/><\/p>\n<p>A posteriori, s&#8217;han dedicat a mesurar l&#8217;orientaci\u00f3 i les inclinacions de les parets de les escletxes i n&#8217;han tret paral\u00b7lelismes. Han obtingut que la majoria tenen una <strong>orientaci\u00f3 nord-oest a sud-est<\/strong>,<strong> s<\/strong>&#8216;<strong>inclinen entre 80 i 90 graus cap a l&#8217;est<\/strong> i tenen obertures des de menys d&#8217;un metre a quasi 3 metres.<\/p>\n<p>Amb tot el que han vist, han reelaborat la hip\u00f2tesis inicial dels<strong>\u00a0fen\u00f2mens erosius. <\/strong>La hist\u00f2ria m\u00e9s factible \u00e9s que els estrats calcaris, m\u00e9s r\u00edgids per\u00f2 amb fissures, hagin anat impregnant-se d&#8217;aigua fins arribar als estrats inferiors argilosos. Com que tot el conjunt es troba inclinat, el m\u00e9s probable \u00e9s que <strong>per gravetat els estrats calcaris s&#8217;hagin esberlat i lliscat, produint aquest conjunt de grans esquerdes<\/strong> conegudes com les Escletxes. Tamb\u00e9 \u00e9s possible que alguns terratr\u00e8mols hagin ajudat al progressiu lliscament. En acabar i de cam\u00ed cap el nucli urb\u00e0 hem pogut veure algunes <strong>afectacions als edificis<\/strong> per lliscament del substrat argil\u00f3s.<\/p>\n<p>Hem reflexionat sobre la nostra recerca i hem concl\u00f2s que <strong>cal con\u00e8ixer b\u00e9 el subs\u00f2l<\/strong> per a dissenyar-hi edificis. Si no avaluem el subs\u00f2l, els riscos geol\u00f2gics poden ser elevat i el cost econ\u00f2mic i social tamb\u00e9. Satisfets de l&#8217;experi\u00e8ncia, els joves de quart han ampliat aquest dia el que estan aprenent a l&#8217;Institut.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>El dia 1 d&#8217;abril, els nois i noies de l&#8217;optativa de biologia i geologia de 4t d&#8217;ESO de l&#8217;Institut Olorda de Sant Feliu de Llobregat, han anat a explorar Les Escletxes del Papiol acompanyats pel Camp d&#8217;aprenentatge Can Santoi. Conjuntament ens hem situat geogr\u00e0ficament el lloc i, despr\u00e9s d&#8217;haver vist les primeres escletxes, hem plantejat [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":14571,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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