{"id":20794,"date":"2024-11-25T14:31:19","date_gmt":"2024-11-25T13:31:19","guid":{"rendered":"https:\/\/navier-lab.fr\/research\/multi-echelle\/doctorantes-et-post-doctorantes\/"},"modified":"2026-09-14T22:42:59","modified_gmt":"2026-09-14T20:42:59","slug":"doctorantes-et-post-doctorantes","status":"publish","type":"page","link":"https:\/\/navier-lab.fr\/en\/research\/multi-echelle\/doctorantes-et-post-doctorantes\/","title":{"rendered":"Doctorant\u2022es et post-doctorant\u2022es"},"content":{"rendered":"

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\n\t\t<\/i>\t<\/div>\n<\/div>\n\n
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Doctorants et post-doctorants actuels <\/h1>\n<\/div>\n<\/div><\/div><\/div>
\n\n \n \"\"
<\/i><\/div> <\/a>\n <\/div>\n
<\/p>\n

Fengyi
<\/strong>Wang<\/strong><\/p>\n

\n<\/div><\/div><\/div>

\n\n \n \"\"
<\/i><\/div> <\/a>\n <\/div>\n
<\/p>\n

Egbekhuwa
Okoyomoh<\/strong><\/p>\n

\n<\/div><\/div><\/div>

\n\n \n \"\"
<\/i><\/div> <\/a>\n <\/div>\n
<\/p>\n

Gerges
Abboud<\/strong><\/p>\n

\n<\/div><\/div><\/div>

\n\n \n \"\"
<\/i><\/div> <\/a>\n <\/div>\n
<\/p>\n

Jean
Ruel<\/strong><\/p>\n

\n<\/div><\/div><\/div>

\n\n \n \"\"
<\/i><\/div> <\/a>\n <\/div>\n
<\/p>\n

Suzanne
L\u00e9onard
<\/strong><\/p>\n

\n<\/div><\/div><\/div>

\n\n \n \"\"
<\/i><\/div> <\/a>\n <\/div>\n
<\/p>\n

Serafim
Egorov<\/strong><\/p>\n

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\n\n \n \"\"
<\/i><\/div> <\/a>\n <\/div>\n
<\/p>\n

Hicham<\/strong>
Cherifi<\/strong><\/p>\n

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\n\n \n \"\"
<\/i><\/div> <\/a>\n <\/div>\n
<\/p>\n

Jinyi<\/strong><\/p>\n

Leng<\/strong><\/p>\n

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\n\n \n \"\"
<\/i><\/div> <\/a>\n <\/div>\n
<\/p>\n

Bilal\u00a0<\/strong><\/p>\n

Mahmoud\u00a0<\/strong><\/p>\n

Hawchar<\/strong><\/p>\n

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<\/div><\/div>
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<\/div><\/div><\/div>\n
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Anciens doctorants et post-doctorants<\/h1>\n<\/div>\n
\n\n \n \"\"
<\/i><\/div> <\/a>\n \t

Tinhinane Chekai<\/p>\n\t <\/div>\n

<\/p>\n

Tinhinane <\/strong><\/p>\n

Chekai<\/strong><\/p>\n

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\n\n \n \"\"
<\/i><\/div> <\/a>\n <\/div>\n
<\/p>\n

Jingyi<\/p>\n

Leng<\/p>\n

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\n\n \n \"\"
<\/i><\/div> <\/a>\n <\/div>\n
<\/p>\n

Adriana<\/p>\n

Quacquarelli<\/p>\n

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\n\n \n \"\"
<\/i><\/div> <\/a>\n <\/div>\n
<\/p>\n

Kefu<\/p>\n

Yao<\/p>\n

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\n\n \n \"\"
<\/i><\/div> <\/a>\n <\/div>\n
<\/p>\n

Franck<\/p>\n

Decroos<\/p>\n

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\n\n \n \"\"
<\/i><\/div> <\/a>\n <\/div>\n
<\/p>\n

\u00a0Dalmer\u00a0<\/strong><\/p>\n

Gomez<\/strong><\/p>\n

Llactahuamani<\/strong><\/p>\n

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\n\n \n \"\"
<\/i><\/div> <\/a>\n \t

Nina Du<\/p>\n\t <\/div>\n

<\/p>\n

Nina<\/strong><\/p>\n

Du<\/strong><\/p>\n

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\n\n \n \"\"
<\/i><\/div> <\/a>\n <\/div>\n
<\/p>\n

Pablo
Eizaguirre
Garcia<\/strong><\/p>\n

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\n\n \n \"\"
<\/i><\/div> <\/a>\n <\/div>\n
<\/p>\n

Catherine
Dore\u0301-
Ossipyan<\/strong><\/p>\n

\n<\/div><\/div><\/div>

\n\n \n \"\"
<\/i><\/div> <\/a>\n <\/div>\n
<\/p>\n

Bilal\u00a0<\/strong><\/p>\n

Mahmoud\u00a0<\/strong><\/p>\n

Hawchar<\/strong><\/p>\n

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<\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/section>
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\n\t\t<\/i>\t<\/div>\n<\/div>\n\n
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Biographies<\/h1>\n<\/div>\n
<\/p>\n

Fengyi Wang
<\/strong><\/h2>\n

\n<\/div>

\n\n \"\" <\/div>\n<\/div><\/div>
<\/p>\n

\nP\u00e9riode<\/span> : 2024 \u2013 2027
<\/em><\/p>\n

Supervision<\/span> : Camille Chateau, Matthieu Vandamme, Michel Bornert<\/em><\/p>\n

\n<\/div>

<\/p>\n

Bonjour, je m’appelle Fengyi. J’ai commenc\u00e9 mon doctorat en novembre 2024. Mon projet de recherche est financ\u00e9 par l\u2019Agence nationale de la recherche (ANR). Le projet vise \u00e0 mieux comprendre l’interaction entre les m\u00e9taux\/oxydes en fusion avec le b\u00e9ton dans le cadre de la s\u00e9curit\u00e9 des centrales nucl\u00e9aires. Dans ces conditions, o\u00f9 le b\u00e9ton est soumis \u00e0 des temp\u00e9ratures croissantes, la microstructure et le comportement du mat\u00e9riau sont progressivement d\u00e9grad\u00e9s. Je me concentre sur le volet exp\u00e9rimental du projet et vise \u00e0 caract\u00e9riser la cin\u00e9tique d\u2019endommagement de la microstructure du mat\u00e9riau soumis \u00e0 de hautes temp\u00e9ratures, en utilisant la microtomographie aux rayons X et la nanoindentation au Laboratoire Navier. Cette \u00e9tude devrait apporter des \u00e9clairages originaux sur les m\u00e9canismes impliqu\u00e9s dans les premiers stades de d\u00e9gradation du b\u00e9ton lors d’accidents nucl\u00e9aires graves.<\/p>\n

\n<\/div><\/div><\/div><\/div>\n

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<\/p>\n

Egbekhuwa Okoyomoh<\/strong><\/h2>\n

\n<\/div>

\n\n \"\" <\/div>\n<\/div><\/div>
<\/p>\n

\nP\u00e9riode<\/span> : 2024 \u2013 2027
<\/em><\/p>\n

Supervision<\/span> : Emmanuel Keita, Nicolas Roussel (UGE – CPDM)
<\/em><\/p>\n

\n<\/div>

<\/p>\n

My research focuses on the Consolidation of earthen materials during drying. As one of the earliest building materials, clay is basically like a building hero, with its affordability, abundance and accessibility. But like every hero, it has a weakness. Its kryptonite is its low mechanical strength and durability. Enter me, fascinated by the clay materials at its core on a mission to figure out exactly how the mechanical strength of these materials can be optimized. Literature provides studies of clays that are fortified with binders and stabilizers. This gives me the opportunity to approach clays as building materials differently. Investigating it just the way nature made it, bare and pure with no additives.<\/p>\n

By studying clay in its natural state, I aim to discover not only the forces present in consolidation but how much each of these forces contribute; thereby optimizing clay properties and redefining clay as a viable building material in the green world we\u2019d all love to live in.<\/p>\n

\n<\/div><\/div><\/div><\/div>\n

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<\/p>\n

Gerges Abboud
<\/strong><\/h2>\n

\n<\/div>

\n\n \"\" <\/div>\n<\/div><\/div>
<\/p>\n

\nP\u00e9riode<\/span> : 2024 \u2013 2027
<\/em><\/p>\n

Supervision<\/span> : Anh-Minh Tang (Navier – CERMES), Philipp Braun (Navier – CERMES), Michel Bornert, Patrick Aimedieu, Benjamin Maillet (Navier – RMP), Rahima Sidi-Boulenouar (Navier – RMP), Minh Ngoc Vu (Andra)
<\/em><\/p>\n

\n<\/div>

<\/p>\n

Je poursuis actuellement une th\u00e8se intitul\u00e9e \u00abCaract\u00e9risation et mod\u00e9lisation du comportement micro-macro hydrom\u00e9canique-gaz des roches argileuses\u00bb en partenariat avec l’ANDRA, l’Agence nationale fran\u00e7aise pour la gestion des d\u00e9chets radioactifs. L’un des principaux d\u00e9fis g\u00e9otechniques actuels est la gestion responsable des d\u00e9chets nucl\u00e9aires. En France, le projet Cig\u00e9o vise \u00e0 stocker ces d\u00e9chets en profondeur, mais la corrosion \u00e0 long terme des conteneurs en acier pourra entra\u00eener la migration de gaz dans la roche environnante, affectant ses propri\u00e9t\u00e9s m\u00e9caniques. Ma recherche aborde ce probl\u00e8me en analysant le ph\u00e9nom\u00e8ne de migration de gaz via des tests en laboratoire et des techniques d’imagerie avanc\u00e9es telles que l’IRM et le XRCT. Les r\u00e9sultats permettront d’affiner les mod\u00e8les existants et d\u00e9velopper un cadre num\u00e9rique plus robuste pour pr\u00e9dire l\u2019impact du gaz dans le stockage g\u00e9ologique.<\/p>\n

\n<\/div><\/div><\/div><\/div>\n

\n\t
\n\t\t\t<\/div>\n<\/div>\n<\/div><\/div><\/div>
<\/p>\n

Tinhinane Chekai<\/strong><\/h2>\n

\n<\/div>

\n\n \"\" <\/div>\n<\/div><\/div>
<\/p>\n

\nP\u00e9riode<\/span> : 2024 \u2013 2025
<\/em><\/p>\n

Supervision<\/span> : Camille Chateau, Phillipe Gl\u00e9\u00a0(Cerema – UMRAE), Thibaut Lecompte\u00a0(Univ. Bretagne Sud, UMR CNRS 6027, IRDL)
<\/em><\/p>\n

\n<\/div>

<\/p>\n

Hello, I started my postdoc position in May 2024 as part of a joint partnership between the Navier Laboratory, where I work with Camille Chateau, and CEREMA in Strasbourg, where I collaborate with Philippe Gl\u00e9. My postdoc is also supervised by Thibaut Lecompte from IRDL at the University of Bretagne Sud. My research focuses on biobased building materials, aiming to understand and establish the relationship between their microstructure, characterized using X-ray tomography, and their multiphysical properties.<\/p>\n

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<\/p>\n

Suzanne L\u00e9onard
<\/strong><\/h2>\n

\n<\/div>

\n\n \"\" <\/div>\n<\/div><\/div>
<\/p>\n

\nP\u00e9riode<\/span> : 2024 \u2013 2027
<\/em><\/p>\n

Supervision<\/span> : Denis Garnier, Anne-Sophie Colas (UGE – RRO), Benjamin Terrade (UGE – EMGCU)<\/em><\/p>\n

\n<\/div>

<\/p>\n

Salut, je suis Suzanne, une ing\u00e9nieure de l\u2019\u00c9cole des ponts tr\u00e8s int\u00e9ress\u00e9e par les m\u00e9thodes de construction \u00e0 faible impact et la maintenance de l\u2019existant. En France, les ouvrages en ma\u00e7onnerie sont nombreux mais vieillissants, et il n\u2019existe pas de m\u00e9thode d\u2019\u00e9valuation structurelle compl\u00e8te faisant consensus parmi les ing\u00e9nieurs. Par mon travail de th\u00e8se, je souhaite proposer une approche bas\u00e9e sur le calcul \u00e0 la rupture pour \u00e9valuer la capacit\u00e9 portante d\u2019une structure en ma\u00e7onnerie existante. Pour y parvenir, je d\u00e9veloppe une approche analytique ainsi qu\u2019une approche num\u00e9rique, le tout compl\u00e9t\u00e9 par des essais exp\u00e9rimentaux sur des maquettes en pierre \u00e0 \u00e9chelle r\u00e9elle. Ce travail se place dans le cadre de l’ANR Menhir.<\/p>\n

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<\/p>\n

Serafim Egorov
<\/strong><\/h2>\n

\n<\/div>

\n\n \"\" <\/div>\n<\/div><\/div>
<\/p>\n

\nP\u00e9riode<\/span> : 2023 \u2013 2026
<\/em><\/p>\n

Supervision<\/span> : Mathias Lebihain, Jean Sulem
<\/em><\/p>\n

\n<\/div>

<\/p>\n

Bonjour \u00e0 tous ! J’ai commenc\u00e9 mon doctorat en octobre 2023 au laboratoire Navier. Avant la th\u00e8se, j’ai \u00e9tudi\u00e9 la m\u00e9canique appliqu\u00e9e \u00e0 l’Universit\u00e9 Polytechnique de Saint-P\u00e9tersbourg et \u00e0 l’\u00c9cole nationale des ponts et chauss\u00e9es. Mon travail de th\u00e8se vise \u00e0 introduire des m\u00e9thodes th\u00e9oriques et num\u00e9riques novatrices pour d\u00e9crire la propagation des ruptures frictionnelles le long d’une faille unique, en utilisant des approches perturbatives et variationnelles en m\u00e9canique lin\u00e9aire de la rupture.<\/p>\n

Notre id\u00e9e principale est d’apporter de la complexit\u00e9 \u00e0 la mod\u00e9lisation physique de la sismicit\u00e9 induite par les fluides en ajoutant des frictions et des h\u00e9t\u00e9rog\u00e9n\u00e9it\u00e9s des failles dans le mod\u00e8le, tout en \u00e9tant capables d’analyser statistiquement les r\u00e9sultats de nombreuses simulations. Nous esp\u00e9rons que la compr\u00e9hensibilit\u00e9 analytique et l’efficacit\u00e9 num\u00e9rique pourront offrir de nouvelles perspectives sur la propagation des ruptures induites par les fluides en trois dimensions et une meilleure compr\u00e9hension de la sismicit\u00e9 induite par les fluides \u00e0 terme.<\/p>\n

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<\/p>\n

Jean Ruel
<\/strong><\/h2>\n

\n<\/div>

\n\n \"\" <\/div>\n<\/div><\/div>
<\/p>\n

\nP\u00e9riode<\/span> : 2023 \u2013 2026
<\/em><\/p>\n

Supervision<\/span> : Fr\u00e9d\u00e9ric Legoll, Arthur Leb\u00e9e, Ludovic Chamoin (LMPS)
<\/em><\/p>\n

\n<\/div>

<\/p>\n

L\u2019objectif de ma th\u00e8se est de d\u00e9velopper des m\u00e9thodes num\u00e9riques robustes et certifi\u00e9es pour la simulation de structures \u00e9lanc\u00e9es (comme les plaques ou les coques), structures fr\u00e9quentes dans de nombreux secteurs industriels. Des approches de type r\u00e9duction de mod\u00e8le sont utilis\u00e9es et compar\u00e9es avec des r\u00e9sultats issus des approches asymptotiques. Des strat\u00e9gies d\u2019estimation d\u2019erreur sont \u00e9galement introduites afin d\u2019adapter la richesse du mod\u00e8le r\u00e9duit \u00e0 la pr\u00e9cision souhait\u00e9e. Plusieurs structures \u00e9lanc\u00e9es sont \u00e9tudi\u00e9es \u00e0 commencer par les plaques homog\u00e8nes et les plaques comportant des h\u00e9t\u00e9rog\u00e9n\u00e9it\u00e9s dans la direction transverse (composites). Un des objectifs est d\u2019\u00e9tendre ces premiers outils au cas de structures \u00e9lanc\u00e9es multi-\u00e9chelle dans le plan. Des questions autour des instabilit\u00e9s de flambage seront aussi abord\u00e9es.<\/p>\n

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<\/p>\n

Hicham Cherifi
<\/strong><\/h2>\n

\n<\/div>

\n\n \"\" <\/div>\n<\/div><\/div>
<\/p>\n

\nP\u00e9riode<\/span> : 2023 \u2013 2026
<\/em><\/p>\n

Supervision<\/span> : Denis Garnier, Anne-Sophie Colas (UGE – RRO), Benjamin Terrade (UGE – EMGCU)<\/em><\/p>\n

\n<\/div>

<\/p>\n

\nBonjour \u00e0 tous ! Je suis Hicham Cherifi, ing\u00e9nieur g\u00e9otechnicien depuis 2017. Apr\u00e8s cinq ann\u00e9es en tant que chef de projet, j\u2019ai d\u00e9cid\u00e9 de me consacrer \u00e0 la recherche en g\u00e9otechnique, plus pr\u00e9cis\u00e9ment sur le comportement des structures en ma\u00e7onnerie face aux impacts du changement climatique. Mon projet de doctorat, encadr\u00e9 par Anne-Sophie Colas, Denis Garnier et Benjamin Terrade, vise \u00e0 d\u00e9velopper des outils m\u00e9thodologiques bas\u00e9s sur la th\u00e9orie du calcul \u00e0 la rupture pour \u00e9valuer la r\u00e9silience \u00e0 long terme de ces structures face risques li\u00e9es aux pluies diluvienne, aux al\u00e9as sismiques et autres d\u00e9fis environnementaux.<\/p>\n

Dans ce travail, j\u2019adopte une approche multidisciplinaire incluant des m\u00e9thodes exp\u00e9rimentales (telles que les mod\u00e8les \u00e0 \u00e9chelle r\u00e9duite et les essais grandeur nature), des simulations num\u00e9riques (FEM, FEM-X, DEM et Mosek) et des approches th\u00e9oriques.<\/p>\n

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<\/p>\n

Bilal Mahmoud Hawchar<\/strong><\/h2>\n

\n<\/div>

\n\n \"\" <\/div>\n<\/div><\/div>
<\/p>\n

\nP\u00e9riode<\/span> : 2025 \u2013 2027
<\/em><\/p>\n

Supervision<\/span> : Laurent Brochard, Jean-Michel Pereira (Navier \u2013 G\u00e9otechnique), Siavash Ghabezloo (Navier \u2013 G\u00e9otechnique)
<\/em><\/p>\n

\n<\/div>

<\/p>\n

\nJe suis Bilal, ing\u00e9nieur civil et titulaire d\u2019un master de l\u2019\u00c9cole Normale Sup\u00e9rieure Paris-Saclay. J\u2019ai r\u00e9alis\u00e9 ma th\u00e8se au laboratoire Navier, en collaboration avec le LMPS et l\u2019ISTO, o\u00f9 j\u2019ai \u00e9tudi\u00e9 la pression de cristallisation des sels dans les milieux poreux. Mes travaux doctoraux combinaient simulations mol\u00e9culaires, mod\u00e9lisation th\u00e9orique et exp\u00e9riences en microfluidique afin de comprendre comment les sels nucl\u00e9ent, croissent et g\u00e9n\u00e8rent des contraintes m\u00e9caniques responsables de la d\u00e9gradation des mat\u00e9riaux.<\/p>\n

Je suis actuellement chercheur postdoctoral et j\u2019\u00e9tudie la pression de cristallisation des hydrates de CO\u2082. Mon projet associe simulations mol\u00e9culaires et exp\u00e9rimentation pour analyser la formation des hydrates en confinement et les contraintes qu\u2019ils exercent. Cette approche multi-\u00e9chelle vise \u00e0 mieux comprendre des m\u00e9canismes essentiels pour les g\u00e9omat\u00e9riaux, les processus environnementaux et divers domaines scientifiques.<\/p>\n

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<\/p>\n

Jingyi Leng<\/h2>\n

\n<\/div><\/div><\/div><\/div>

\n\n \"\" <\/div>\n<\/div><\/div>
<\/p>\n

\nP\u00e9riode<\/span> : 2025 \u2013 2027
<\/em><\/p>\n

Supervision<\/span> :\u00a0 Laurent Brochard
<\/em><\/p>\n

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<\/p>\n

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Biographies d'anciens chercheurs doctorants et postdoctorants<\/h1>\n<\/div>\n
<\/p>\n

Adriana Quacquarelli
<\/strong><\/h2>\n

\n<\/div>

\n\n \"\" <\/div>\n<\/div><\/div>
<\/p>\n

\nP\u00e9riode<\/span> : 2023 \u2013 2025
<\/em><\/p>\n

Supervision<\/span> : Michel Bornert
<\/em><\/p>\n

\n<\/div>

<\/p>\n

Je suis postdoc et je travaille avec Michel Bornert sur le traitement d’images de donn\u00e9es tomographiques. L’objectif est de r\u00e9aliser des analyses qualitatives et quantitatives sur le comportement des roches, qui vont des roches carbonat\u00e9es h\u00e9t\u00e9rog\u00e8nes aux roches polycristallines de sel gemme, dans le but de comprendre leur capacit\u00e9 de stockage souterrain dans le cadre de la transition \u00e9nerg\u00e9tique.<\/p>\n

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<\/p>\n

Kefu Yao
<\/strong><\/h2>\n

\n<\/div>

\n\n \"\" <\/div>\n<\/div><\/div>
<\/p>\n

\nP\u00e9riode<\/span> : 2023 \u2013 2025
<\/em><\/p>\n

Supervision<\/span> : Matthieu Vandamme, Jean-Michel Torrenti (UGE), Huaizhi Su (Hohai)
<\/em><\/p>\n

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Bonjour! Je m’appelle Kefu, doctorant \u00e0 l’Universit\u00e9 Hohai. Depuis f\u00e9vrier 2023, je travaille sous la supervision de Matthieu Vandamme et Jean-Michel Torrenti. Mon sujet de doctorat porte sur les d\u00e9formations diff\u00e9r\u00e9es et les d\u00e9formations d\u00e9pendantes du temps du b\u00e9ton structurel soumis au fluage et au retrait, qui constituent des indicateurs essentiels de s\u00e9curit\u00e9 pour les structures en b\u00e9ton ayant une dur\u00e9e de vie de plusieurs d\u00e9cennies. Dans nos travaux, nous avons \u00e9tudi\u00e9 une m\u00e9thode de calcul unifi\u00e9e pour le fluage et le retrait en utilisant la porom\u00e9canique, d\u00e9velopp\u00e9 des outils num\u00e9riques pour les simulations coupl\u00e9es du fluage et du retrait, et propos\u00e9 un mod\u00e8le pr\u00e9dictif, bas\u00e9 sur des donn\u00e9es physiques, pour les d\u00e9placements des barrages. Enfin, nous avons appliqu\u00e9 ces mod\u00e8les et outils \u00e0 l’analyse des d\u00e9formations dans des projets r\u00e9els d’ing\u00e9nierie des barrages. Nous esp\u00e9rons que cette recherche offre une solution compl\u00e8te, depuis la compr\u00e9hension des origines physiques jusqu\u2019aux applications industrielles, afin d’assurer la s\u00e9curit\u00e9 \u00e0 long terme des structures en b\u00e9ton affect\u00e9es par le fluage et le retrait.<\/p>\n

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Franck Decroos
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\nP\u00e9riode<\/span> : 2022 \u2013 2024
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Supervision<\/span> : Michel Bornert, Patrick Aimedieu, S\u00e9bastien Brisard (LMA \u2013 Aix Marseille Universit\u00e9)
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Hello I am Franck, a postdoctoral fellow in Navier laboratory. I received my Mechanical Engineering and Design degree in 2017, followed by a Ph.D. in 2022 which was a great opportunity to supplement my knowledge of physics. Methodological development in solid physics is my passion! So far, I have been working with micro-wave, visible, and X-ray interactions with matter \u2013 as well as near-field measurements and full-field techniques. My experimental versatility goes together with skills in computer science and coding (python, JavaScript, MATLAB, C#).<\/p>\n

Here in Navier we have developed a contrast-enhancement technique for X-ray Computed Tomography using a CdTe Photon Counting Detector: For the first time in rock carbonates quartz grains can be discriminated from calcite matrix !<\/p>\n

Other areas of interest include: teaching, political representation, accessibility for disabled, accessibility to knowledge, inclusivity, equality, open science, ethics and integrity in science, and sustainable development.<\/p>\n

Follow me on ResearchGate<\/a> or LinkedIn<\/a>.<\/p>\n

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Dalmer Gomez Llactahuamani<\/strong><\/h2>\n

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\nP\u00e9riode<\/span> : 2022 \u2013 2025
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Supervision<\/span> : Nicolas Peyret (Isae-Supm\u00e9ca), Gwendal Cumunel, Thomas Catterou (FCBA), Michel Bornert
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I’m a PhD candidate (10\/2022-10\/2025). My subjects of interest: wood construction, camera measurements, statics and dynamics of assemblies.<\/p>\n

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Jingyi Leng<\/h2>\n

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\nP\u00e9riode<\/span> : 2021 \u2013 2025
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Supervision<\/span> : Matthieu Vandamme, Patrick Dangla, Laurent Brochard
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Bonjour, je m\u2019appelle Jingyi LENG, je suis doctorante \u00e0 l\u2019Ecole des Ponts depuis octobre 2021. Mes travaux portent sur la mod\u00e9lisation de la d\u00e9formation induite par la sorption dans les milieux poreux. Nous am\u00e9liorons un mod\u00e8le porom\u00e9canique propos\u00e9 par El Tabbal et al. (2020), bas\u00e9 sur la th\u00e9orie thermodynamique et qui prend en compte l\u2019effet capillaire, l\u2019effet Bangham et l\u2019effet Shuttleworth. Ce mod\u00e8le pr\u00e9dit bien la d\u00e9formation induite par la sorption dans les mat\u00e9riaux poreux avec une large distribution de la taille des pores. Je fais \u00e9galement des simulations de dynamique mol\u00e9culaire (MD) et de grand canonique Monte Carlo (GCMC) pour mod\u00e9liser l\u2019adsorption de l\u2019eau dans les m\u00e9so- et micropores de C-S-H, ce qui me permet d\u2019avoir une perspective microscopique sur la d\u00e9formation induite par la sorption.<\/p>\n

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Bilal <\/strong>Mahmoud <\/strong>Hawchar<\/strong><\/h2>\n<\/div>\n<\/div>\n

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\nP\u00e9riode<\/span> : 2022 \u2013 2025
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Supervision<\/span> : Laurent Brochard, Matthieu Vandamme, Jean-Michel Pereira, Tulio Honorio (LMPS), Lionel Mercury (ISTO), Florian Osselin (ISTO)
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Durant ce doctorat que j’ai commenc\u00e9 en octobre 2022, mes recherches portent sur la pression de cristallisation, un processus fondamental qui se produit lors de la cristallisation du sel au sein de milieux poreux. Ce ph\u00e9nom\u00e8ne contribue de mani\u00e8re significative \u00e0 la d\u00e9gradation des mat\u00e9riaux de construction, des g\u00e9omat\u00e9riaux et du patrimoine b\u00e2ti. Lorsqu’ils cristallisent, les sels peuvent exercer une pression m\u00e9canique sur les surfaces des pores, entra\u00eenant ainsi la d\u00e9gradation des mat\u00e9riaux. Malgr\u00e9 son importance, les m\u00e9canismes de cristallisation au sein des milieux poreux restent mal compris. Notre \u00e9tude combine des simulations mol\u00e9culaires, des d\u00e9veloppements th\u00e9oriques et des exp\u00e9riences microfluidiques pour quantifier et clarifier les origines de la pression de cristallisation \u00e0 l’\u00e9chelle la plus fine. Cette approche vise \u00e0 identifier les param\u00e8tres contr\u00f4lant ce ph\u00e9nom\u00e8ne, offrant des perspectives pour att\u00e9nuer ou pr\u00e9venir les dommages caus\u00e9s par les sels.<\/p>\n

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Nina Du<\/h2>\n

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\nP\u00e9riode<\/span> : 2021 \u2013 2025
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Supervision<\/span> : Alexandre Dimanov (LMS), Michel Bornert
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I\u2019m Nina and I have started my PH.D. in December 2021, after graduating from Ecole Centrale Nantes. I am working with Alexandre Dimanov at the Laboraroty of Solid Mechanics (LMS) and Michel Bornert at Navier. I am studying the mechanical properties of synthetic rock salt using triaxial tests combined with different imaging technics (X-Ray tomography, SEM observation). Why rock salt?\u00a0 Storage of hydrogen in salt caverns is a promising solution to store energy, especially in a context of energy transition, and it has been in used for decades to store. A better understanding of the material is thus needed.<\/p>\n

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Pablo Eizaguirre Garcia<\/h2>\n

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\nP\u00e9riode<\/span> : 2021 \u2013 2024
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Supervision<\/span> : Anh Minh Tang, Patrick Dangla, Michel Bornert, Patrick Aimedieu, Jean-Michel Pereira, Benjamin Maillet, Rahima Sidi-Boulenouar, Jean Talandier<\/em> (Andra)<\/em>, Minh-Ngoc Vu (Andra)
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This is Pablo, originally MSc on Civil Engineering by the Universidad de Cantabria (Spain). I started in 2021 my PhD Thesis titled \u201cMultiscale characterization and modelling of the hydromechanic-gas behaviour of a bentonite-sand mixture\u201d. The PhD is a collaboration between three groups of Navier laboratory (G\u00e9otechnique, Multi-Echelle and RMP) with Andra (French National Agency for Radioactive Waste Management). We study the multiphysics involved in the processes of hydration and gas migration in an expansive material for the sealing systems of the Cig\u00e9o project (deep geological disposal) led by Andra. Our main contributions involved experimental techniques such as NMR relaxometry, MRI and X-Ray \u00b5CT, notably the quantification of adsorbed\/free water populations and the detection of gas pathways. A numerical framework reproducing the hydromechanical-gas behaviour was provided in the in-house opensource MEF-code \u201cBil\u201d.<\/p>\n

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Catherine Dor\u00e9-Ossipyan<\/h2>\n

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\nP\u00e9riode<\/span> : 2021 \u2013 2024
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Supervision<\/span> : Jean Sulem, Michel Bornert, Alexandre Dimanov (LMS)
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I am a PhD student working across two teams: the Multi-Scale and Geotechnics teams, as well as with another laboratory, the Laboratoire de M\u00e9canique des Solides (IPP-X). My research focuses on the experimental investigation of deformation modes in the elementary microstructures that constitute a heterogeneous carbonate rock. This work involves combining mechanical tests with imaging techniques, allowing for continuous monitoring of local deformation processes. This approach generates a tremendous amount of data to analyze but provides high-quality insights into the deformation under various scales and loading conditions. Ultimately, my thesis aims to establish a methodological framework for modeling geological reservoirs.<\/p>\n

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