{"id":52902,"date":"2025-12-16T15:28:49","date_gmt":"2025-12-16T20:28:49","guid":{"rendered":"https:\/\/www.uqac.ca\/uqactualites\/?p=52902"},"modified":"2025-12-17T13:41:22","modified_gmt":"2025-12-17T18:41:22","slug":"vineeth-reddy-karnati-etudiant-au-doctorat-en-ingenierie-soutient-sa-these","status":"publish","type":"post","link":"https:\/\/www.uqac.ca\/uqactualites\/2025\/12\/16\/vineeth-reddy-karnati-etudiant-au-doctorat-en-ingenierie-soutient-sa-these\/","title":{"rendered":"Vineeth Reddy Karnati, \u00e9tudiant au doctorat en ing\u00e9nierie, soutient sa th\u00e8se"},"content":{"rendered":"

Finissant au\u00a0doctorat en ing\u00e9nierie<\/a>, Vineeth Reddy Karnati, a effectu\u00e9 sa soutenance de th\u00e8se le 15 d\u00e9cembre 2025. Sous la direction de recherche d\u2019Ali Saeidi<\/a> (UQAC) et la codirection d’Alain Rouleau<\/a> (UQAC) et de Marco Quirion (Hydro-Qu\u00e9bec), sa th\u00e8se a pour titre \u00ab Influence de la g\u00e9om\u00e9trie des joints et de la rugosit\u00e9 de surface sur les pressions hydrauliques et la stabilit\u00e9 des blocs dans les \u00e9vacuateurs de crues \u00e0 l\u2019\u00e9chelle de laboratoire \u00bb.<\/p>\n

Sous la pr\u00e9sidence de Julien Walter<\/a> (UQAC), le jury d’\u00e9valuation \u00e9tait compos\u00e9 d’\u00c9ric Villeneuve (UQAR) et d’Adoubi Vincent De Paul Adombi<\/a> (UQAC).<\/p>\n

\n
R\u00e9sum\u00e9 de la th\u00e8se<\/h5>\n

Bien que le massif rocheux offre en g\u00e9n\u00e9ral une plus grande r\u00e9sistance \u00e0 l\u2019\u00e9rosion que les d\u00e9p\u00f4ts alluviaux, des cas graves d\u2019\u00e9rosion de la roche ont n\u00e9anmoins \u00e9t\u00e9 signal\u00e9s dans plusieurs \u00e9vacuateurs de crues de barrages \u00e0 travers le monde, m\u00eame dans des contextes de roche dure. Lors de crues extr\u00eames, accentu\u00e9es par les changements climatiques, cette \u00e9rosion constitue une menace croissante pour la s\u00e9curit\u00e9 des barrages, notamment au Qu\u00e9bec et au Canada, o\u00f9 l\u2019hydro\u00e9lectricit\u00e9 repr\u00e9sente un pilier majeur de l\u2019approvisionnement \u00e9nerg\u00e9tique.<\/p>\n

Cette \u00e9tude s\u2019amorce par une revue de litt\u00e9rature approfondie sur les m\u00e9canismes d\u2019\u00e9rosion et les m\u00e9thodes classiques de pr\u00e9diction. Les approches semi-empiriques traditionnelles s\u2019av\u00e8rent souvent insuffisantes, car elles n\u00e9gligent certains m\u00e9canismes cl\u00e9s et ignorent des param\u00e8tres hydrauliques et g\u00e9om\u00e9caniques propres aux sites. Ces limites entra\u00eenent fr\u00e9quemment des \u00e9carts notables entre les profondeurs d\u2019\u00e9rosion pr\u00e9vues et celles observ\u00e9es sur le terrain, ce qui met en \u00e9vidence la n\u00e9cessit\u00e9 de m\u00e9thodes davantage fond\u00e9es sur les m\u00e9canismes physiques.<\/p>\n

\nVoir plus<\/strong><\/summary>\n

La recherche se concentre sur les \u00e9vacuateurs de crues non rev\u00eatus, en mettant l\u2019accent sur l\u2019arrachage de blocs rocheux, reconnu comme un mode de d\u00e9faillance dominant. Une s\u00e9rie d\u2019essais physiques \u00e0 \u00e9chelle r\u00e9duite a permis d\u2019analyser l\u2019effet de param\u00e8tres cl\u00e9s, le d\u00e9bit, l\u2019ouverture des joints, la saillie des blocs et leur orientation, sur la stabilit\u00e9 et le soul\u00e8vement des blocs sous des conditions d\u2019\u00e9coulement parall\u00e8le.<\/p>\n

Un mod\u00e8le pilote, constitu\u00e9 de blocs-mod\u00e8les repr\u00e9sentant un massif fractur\u00e9 interconnect\u00e9, a servi \u00e0 mesurer en d\u00e9tail les pressions hydrauliques autour d\u2019un bloc central instrument\u00e9 selon diverses configurations exp\u00e9rimentales. Les r\u00e9sultats montrent que les fluctuations de pression \u00e0 la surface du canal, particuli\u00e8rement en dessus des blocs, jouent un r\u00f4le d\u00e9terminant dans l\u2019initiation du soul\u00e8vement. En revanche, les pressions mesur\u00e9es dans les joints demeurent relativement stables, ind\u00e9pendamment de l\u2019\u00e9coulement ou de la g\u00e9om\u00e9trie.<\/p>\n

Un mod\u00e8le math\u00e9matique pr\u00e9dictif a \u00e9t\u00e9 d\u00e9velopp\u00e9 pour estimer les fluctuations extr\u00eames de pression hydraulique \u00e0 la surface des blocs et \u00e9valuer le risque de soul\u00e8vement selon les configurations. Ce mod\u00e8le a d\u00e9montr\u00e9 une concordance satisfaisante avec les r\u00e9sultats exp\u00e9rimentaux, avec des erreurs quadratiques moyennes (RMSE<\/em>) de 0,04 \u00e0 0,37, confirmant sa fiabilit\u00e9. Des essais additionnels ont examin\u00e9 l\u2019effet de l\u2019orientation des blocs (-45\u00b0, 0\u00b0, +45\u00b0). Les blocs inclin\u00e9s \u00e0 contre-courant tendaient \u00e0 basculer avant de se soulever, avec des facteurs de s\u00e9curit\u00e9 (Fs<\/em>) entre 0,5 et 0,8, tandis que ceux align\u00e9s avec le courant se soulevaient plus directement, avec des Fs <\/em>entre 0,2 et 0,7. Les blocs perpendiculaires au courant ont montr\u00e9 une stabilit\u00e9 accrue.<\/p>\n

Enfin, une analyse param\u00e9trique a \u00e9valu\u00e9 l\u2019influence de la g\u00e9om\u00e9trie des blocs, rapport d\u2019aspect, longueur expos\u00e9e et angle de frottement, sur la stabilit\u00e9 sous diverses sollicitations hydrauliques. Les r\u00e9sultats confirment que ces param\u00e8tres, combin\u00e9s \u00e0 l\u2019orientation, doivent imp\u00e9rativement \u00eatre int\u00e9gr\u00e9s \u00e0 toute \u00e9valuation rigoureuse du potentiel d\u2019\u00e9rosion.<\/p>\n

Dans l\u2019ensemble, cette recherche am\u00e9liore la compr\u00e9hension de l\u2019interaction complexe entre facteurs hydrauliques et g\u00e9om\u00e9caniques dans l\u2019\u00e9rosion des massifs rocheux aux \u00e9vacuateurs de crues de barrages et propose des outils analytiques fiables pour l\u2019\u00e9valuation de la stabilit\u00e9 des blocs.<\/p>\n<\/details>\n

\n

F\u00e9licitations \u00e0 Vineeth Reddy Karnati pour la soutenance de sa th\u00e8se de doctorat!<\/p>\n","protected":false},"excerpt":{"rendered":"

Finissant au\u00a0doctorat en ing\u00e9nierie, Vineeth Reddy Karnati, a effectu\u00e9 sa soutenance de th\u00e8se le 15 d\u00e9cembre 2025. Sous la direction de recherche d\u2019Ali Saeidi (UQAC) et la codirection d’Alain Rouleau (UQAC) et de Marco Quirion (Hydro-Qu\u00e9bec), sa th\u00e8se a pour titre \u00ab Influence de la g\u00e9om\u00e9trie des joints et de la rugosit\u00e9 de surface sur […]<\/p>\n","protected":false},"author":5,"featured_media":52906,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2844,248,2913],"tags":[],"yoast_head":"\r\nVineeth Reddy Karnati, \u00e9tudiant 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\/2025\/12\/16\/vineeth-reddy-karnati-etudiant-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=\"Vineeth Reddy Karnati, \u00e9tudiant au doctorat en ing\u00e9nierie, soutient sa th\u00e8se - UQACtualit\u00e9s\" \/>\r\n<meta property=\"og:description\" content=\"Finissant au\u00a0doctorat en ing\u00e9nierie, Vineeth Reddy Karnati, a effectu\u00e9 sa soutenance de th\u00e8se le 15 d\u00e9cembre 2025. 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