{"id":53808,"date":"2026-03-10T08:00:53","date_gmt":"2026-03-10T12:00:53","guid":{"rendered":"https:\/\/www.uqac.ca\/uqactualites\/?p=53808"},"modified":"2026-03-02T09:49:14","modified_gmt":"2026-03-02T14:49:14","slug":"mahsa-mahdavirad-etudiante-au-doctorat-en-ingenierie-soutient-sa-these","status":"publish","type":"post","link":"https:\/\/www.uqac.ca\/uqactualites\/2026\/03\/10\/mahsa-mahdavirad-etudiante-au-doctorat-en-ingenierie-soutient-sa-these\/","title":{"rendered":"Mahsa Mahdavirad, \u00e9tudiante au doctorat en ing\u00e9nierie, soutient sa th\u00e8se"},"content":{"rendered":"<p>Finissante au <a href=\"https:\/\/www.uqac.ca\/programme\/3737-doctorat-en-ingenierie\/\" target=\"_blank\" rel=\"noopener\">doctorat en ing\u00e9nierie<\/a>, Mahsa Mahdavirad a effectu\u00e9 sa soutenance de th\u00e8se le 9 mars 2026. Sous la direction de recherche d&rsquo;<a href=\"https:\/\/portfolio.uqac.ca\/alisaeidi\/\" target=\"_blank\" rel=\"noopener\">Ali Saeidi<\/a> (UQAC) et la codirection de Jean-Fran\u00e7ois No\u00ebl (Hydro-Qu\u00e9bec), sa th\u00e8se a pour titre \u00ab\u00c9tude des crit\u00e8res de r\u00e9sistance au cisaillement des discontinuit\u00e9s rocheuses et d\u00e9veloppement de m\u00e9thodes d\u2019estimation de la taille des blocs rocheux fond\u00e9es sur la persistance des discontinuit\u00e9s\u00bb.<\/p>\n<p>Sous la pr\u00e9sidence d&rsquo;<a href=\"https:\/\/portfolio.uqac.ca\/ahmedrahem\/\" target=\"_blank\" rel=\"noopener\">Ahmed Rahem<\/a> (UQAC), le jury d&rsquo;\u00e9valuation \u00e9tait compos\u00e9 de Patrice Rivard (Universit\u00e9 de Sherbrooke) et d&rsquo;Abbas Kamali Bandpey (ArcelorMittal Mines et Infrastructure Canada).<\/p>\n<hr \/>\n<h5>R\u00e9sum\u00e9 de la th\u00e8se<\/h5>\n<p>Consid\u00e9rer la stabilit\u00e9 des massifs rocheux lors de leur conception est fondamentale pour la s\u00e9curit\u00e9 des projets g\u00e9otechniques et miniers. Cette stabilit\u00e9 d\u00e9pend d\u2019une vari\u00e9t\u00e9 de facteurs \u2013 incluant l\u2019orientation des joints, les propri\u00e9t\u00e9s de r\u00e9sistance de la roche (r\u00e9sistances \u00e0 la compression, \u00e0 la traction et au cisaillement), et les conditions de contraintes in-situ. Une compr\u00e9hension approfondie de ces param\u00e8tres est essentielle pour identifier les m\u00e9canismes potentiels de rupture et concevoir des syst\u00e8mes de sout\u00e8nement efficaces. La mesure pr\u00e9cise de chaque variable augmente la fiabilit\u00e9 des conceptions g\u00e9om\u00e9caniques ; cependant, des incertitudes apparaissent souvent \u00e0 cause des erreurs de mesure ou de la disponibilit\u00e9 de plusieurs m\u00e9thodes d\u2019essai pour une m\u00eame propri\u00e9t\u00e9.<\/p>\n<p>Un d\u00e9fi majeur en ing\u00e9nierie des roches est l\u2019\u00e9rosion des massifs rocheux soumis \u00e0 l\u2019action de l\u2019eau en \u00e9coulement. Des recherches r\u00e9centes ont identifi\u00e9 les param\u00e8tres cl\u00e9s gouvernant la r\u00e9sistance aux forces \u00e9rosives : la r\u00e9sistance au cisaillement des joints, la nature de la surface \u00e9rodable, le volume des blocs rocheux, l\u2019ouverture des joints, la g\u00e9om\u00e9trie et l\u2019orientation des blocs par rapport \u00e0 la direction de l\u2019\u00e9coulement, ainsi que le module de d\u00e9formation du massif rocheux. Le d\u00e9veloppement d\u2019une nouvelle m\u00e9thode de pr\u00e9vision de l\u2019\u00e9rosion n\u00e9cessite donc \u00e0 la fois une compr\u00e9hension plus approfondie de ces param\u00e8tres et des am\u00e9liorations dans les techniques utilis\u00e9es pour leur d\u00e9termination. Cette th\u00e8se de doctorat se concentre sur deux param\u00e8tres g\u00e9om\u00e9caniques critiques \u2013 la r\u00e9sistance au cisaillement des joints rocheux et le volume des blocs rocheux \u2013 en les abordant s\u00e9quentiellement.<\/p>\n<details>\n<summary><strong>Voir plus<\/strong><\/summary>\n<p>Dans la premi\u00e8re partie de l&rsquo;\u00e9tude, la r\u00e9sistance au cisaillement des joints rocheux est examin\u00e9e de mani\u00e8re critique. Les facteurs influen\u00e7ant cette propri\u00e9t\u00e9 sont pass\u00e9s en revue, incluant les caract\u00e9ristiques des joints, les conditions de contrainte, et les effets hydrog\u00e9ologiques. L\u2019\u00e9tude discute divers crit\u00e8res de r\u00e9sistance au cisaillement des joints rocheux, en exposant leurs limites et leurs applications pratiques. En utilisant des donn\u00e9es d\u2019essais de cisaillement direct provenant de la centrale du barrage Romaine-IV, les capacit\u00e9s pr\u00e9dictives des crit\u00e8res de Mohr\u2013Coulomb, Patton et Barton\u2013Bandis sont compar\u00e9es. Il est d\u00e9montr\u00e9 que le crit\u00e8re de Barton-Bandis tend \u00e0 surestimer la r\u00e9sistance au cisaillement des joints par rapport aux autres mod\u00e8les sous les conditions test\u00e9es.<\/p>\n<p>La seconde partie traite du d\u00e9fi pos\u00e9 par l\u2019estimation fiable du volume des blocs rocheux au sein de massifs rocheux fractur\u00e9s caract\u00e9ris\u00e9s par des joints non persistants. Les m\u00e9thodes traditionnelles, qui supposent typiquement la persistance totale des joints, repr\u00e9sentent inad\u00e9quatement la variabilit\u00e9 et la complexit\u00e9 inh\u00e9rentes aux formations rocheuses naturelles. Pour surmonter ces limites, cette \u00e9tude utilise une mod\u00e9lisation par r\u00e9seaux de fractures discr\u00e8tes (DFN) \u00e0 l\u2019aide du logiciel 3DEC, en int\u00e9grant la persistance, l\u2019orientation et l\u2019espacement des joints. Une \u00e9quation bas\u00e9e sur la persistance a \u00e9t\u00e9 d\u00e9velopp\u00e9e, am\u00e9liorant significativement la pr\u00e9cision des pr\u00e9visions du volume moyen des blocs. Cette \u00e9quation a \u00e9t\u00e9 valid\u00e9e \u00e0 travers des applications pratiques, incluant une analyse de l\u2019\u00e9vacuateur de crue du barrage de Brogo. En outre, une m\u00e9thode probabiliste pour \u00e9valuer la distribution in-situ des tailles des blocs (IBSD) a \u00e9t\u00e9 d\u00e9velopp\u00e9e, aboutissant \u00e0 six \u00e9quations qui quantifient la proportion des volumes des blocs selon diff\u00e9rentes cat\u00e9gories de taille. L\u2019efficacit\u00e9 de cette approche probabiliste a \u00e9t\u00e9 valid\u00e9e par des simulations num\u00e9riques et des \u00e9tudes de cas pratiques, notamment celle de l\u2019\u00e9vacuateur de crue du barrage de Dartmouth. Les m\u00e9thodologies am\u00e9lior\u00e9es pr\u00e9sent\u00e9es offrent des outils pratiques aux ing\u00e9nieurs pour pr\u00e9dire de mani\u00e8re fiable les tailles des blocs et leurs distributions, am\u00e9liorant ainsi significativement la s\u00e9curit\u00e9, la stabilit\u00e9 et l\u2019efficacit\u00e9 de conception des ouvrages rocheux.<\/p>\n<\/details>\n<hr \/>\n<p>F\u00e9licitations \u00e0 Mahsa Mahdavirad pour la soutenance de sa th\u00e8se de doctorat!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Finissante au doctorat en ing\u00e9nierie, Mahsa Mahdavirad a effectu\u00e9 sa soutenance de th\u00e8se le 9 mars 2026. Sous la direction de recherche d&rsquo;Ali Saeidi (UQAC) et la codirection de Jean-Fran\u00e7ois No\u00ebl (Hydro-Qu\u00e9bec), sa th\u00e8se a pour titre \u00ab\u00c9tude des crit\u00e8res de r\u00e9sistance au cisaillement des discontinuit\u00e9s rocheuses et d\u00e9veloppement de m\u00e9thodes d\u2019estimation de la taille [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":53809,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2913],"tags":[21,247],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>Mahsa Mahdavirad, \u00e9tudiante au doctorat en ing\u00e9nierie, soutient sa th\u00e8se - UQACtualit\u00e9s<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/www.uqac.ca\/uqactualites\/2026\/03\/10\/mahsa-mahdavirad-etudiante-au-doctorat-en-ingenierie-soutient-sa-these\/\" \/>\r\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"Mahsa Mahdavirad, \u00e9tudiante au doctorat en ing\u00e9nierie, soutient sa th\u00e8se - UQACtualit\u00e9s\" \/>\r\n<meta property=\"og:description\" content=\"Finissante au doctorat en ing\u00e9nierie, Mahsa Mahdavirad a effectu\u00e9 sa soutenance de th\u00e8se le 9 mars 2026. Sous la direction de recherche d&rsquo;Ali Saeidi (UQAC) et la codirection de Jean-Fran\u00e7ois No\u00ebl (Hydro-Qu\u00e9bec), sa th\u00e8se a pour titre \u00ab\u00c9tude des crit\u00e8res de r\u00e9sistance au cisaillement des discontinuit\u00e9s rocheuses et d\u00e9veloppement de m\u00e9thodes d\u2019estimation de la taille [&hellip;]\" \/>\r\n<meta property=\"og:url\" content=\"https:\/\/www.uqac.ca\/uqactualites\/2026\/03\/10\/mahsa-mahdavirad-etudiante-au-doctorat-en-ingenierie-soutient-sa-these\/\" \/>\r\n<meta property=\"og:site_name\" content=\"UQACtualit\u00e9s\" \/>\r\n<meta property=\"article:published_time\" content=\"2026-03-10T12:00:53+00:00\" \/>\r\n<meta property=\"article:modified_time\" content=\"2026-03-02T14:49:14+00:00\" \/>\r\n<meta property=\"og:image\" content=\"https:\/\/www.uqac.ca\/uqactualites\/wp-content\/uploads\/2026\/03\/A-la-une-UQACtualite-82-1024x576.png\" \/>\r\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\r\n\t<meta property=\"og:image:height\" content=\"576\" \/>\r\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\r\n<meta name=\"author\" content=\"Service des communications et des relations publiques\" \/>\r\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\r\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Service des communications et des relations publiques\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimation du temps de lecture\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\r\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.uqac.ca\/uqactualites\/2026\/03\/10\/mahsa-mahdavirad-etudiante-au-doctorat-en-ingenierie-soutient-sa-these\/\",\"url\":\"https:\/\/www.uqac.ca\/uqactualites\/2026\/03\/10\/mahsa-mahdavirad-etudiante-au-doctorat-en-ingenierie-soutient-sa-these\/\",\"name\":\"Mahsa Mahdavirad, \u00e9tudiante au doctorat en ing\u00e9nierie, soutient sa th\u00e8se - 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