{"id":19668,"date":"2025-04-09T09:43:48","date_gmt":"2025-04-09T07:43:48","guid":{"rendered":"https:\/\/navier-lab.fr\/?post_type=event&#038;p=19668"},"modified":"2025-04-09T09:43:48","modified_gmt":"2025-04-09T07:43:48","slug":"seminaire-geotech-wenqing-cai","status":"publish","type":"event","link":"https:\/\/navier-lab.fr\/en\/agenda\/seminaire-geotech-wenqing-cai\/","title":{"rendered":"Geotech Young Seminar Series: Wenqing Cai (Navier)"},"content":{"rendered":"<section class=\"kc-elm kc-css-894698 kc_row\"><div class=\"kc-row-container  kc-container\"><div class=\"kc-wrap-columns\"><div class=\"kc-elm kc-css-103227 kc_col-sm-12 kc_column kc_col-sm-12\"><div class=\"kc-col-container\">\n<div class=\"kc-elm kc-css-770264 kc-title-wrap \">\n\n\t<h1 class=\"kc_title\">Gas transfer in compacted bentonite\/sand mixtures <\/h1>\n<\/div>\n<div class=\"kc-elm kc-css-326814 kc_text_block\"><\/p>\n<h2><strong>Abstract:<\/strong><\/h2>\n<p style=\"text-align: justify;\">The deep geological storage has been widely adopted for long-lived high-level radioactive wastes. Compacted bentonite\/sand mixtures have been recognized as suitable sealing materials in many countries, due to their favorable hydro-mechanical behavior. However, gas will be produced after closure of repository and thus the gas pressure will be accumulated, threatening the safety of sealing system. To investigate the HM-gas properties in bentonite\/sand mixtures, compacted samples were firstly saturated under constant volume condition and the swelling pressure and hydraulic conductivity were measured. Then, gas injection was carried out and the gas breakthrough pressure and gas permeability were determined. Meanwhile, MIP test was performed to study the microstructural evolution during saturation and gas injection. It was found that the bentonite fraction and dry density had a significant influence on the HM-gas properties. Additionally, a heterogenous distribution of degree of saturation was observed in saturated samples, which was linked to the bentonite profile. It appeared that the two-phase flow was the dominant mechanism of gas transfer, with water drainage. Finally, based on experimental results, a model is being developed to simulate the HM-gas properties for the used sample and a complete sealing core in the repository.<\/p>\n<p>\n<\/div><div class=\"kc-elm kc-css-826182 kc_text_block\"><\/p>\n<h2><strong>Short bio:<\/strong><\/h2>\n<p style=\"text-align: justify;\">Wenqing Cai obtained his master degree in Geotechnical engineering from Zhejiang University (China, 2022). He is now a PhD student at CERMES of Navier Laboratory, supervised by Prof. Yu-Jun Cui in collaboration with Andra (National Agency for the Management of Radioactive Waste) since 2022. His study aims to investigate the gas transfer and hydro-mechanical behavior of bentonite\/sand mixtures, in both experimental and numerical aspects. <\/p>\n<p>\n<\/div><\/div><\/div><\/div><\/div><\/section>\n","protected":false},"excerpt":{"rendered":"<p>Gas transfer in compacted  bentonite\/sand mixtures <\/p>\n","protected":false},"author":158,"featured_media":0,"template":"","class_list":["post-19668","event","type-event","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/event\/19668","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/event"}],"about":[{"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/types\/event"}],"author":[{"embeddable":true,"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/users\/158"}],"wp:attachment":[{"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/media?parent=19668"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}