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Daniel Dias: Numerical back-analysis of the southern Toulon tunnel measurements: a comparisonof 3D and 2D approaches

发布时间:2018-06-07   来源:汽车与交通工程学院   ( /文  /图)  

报告时间:2018年67(星期四),19:00

报告地点:屯溪路校区人文楼“交通环境与能源”外专千人研讨室

报告人:Daniel Dias教授

工作单位:Grenoble Alpes University

举办单位:汽车与交通工程学院

报告人简介:

Daniel Dias 教授是我校兼职教授,安徽省外专"百人计划"获得者。Daniel Dias 教授毕业于法国国立应用科学学院(INSA),现为法国阿尔卑斯大学(Grenoble Alpes University)一级教授,长期致力于城市轨道交通等方面的研究,是该领域的国际知名专家。Daniel Dias 教授以课题第一负责人承担法国国家研究计划等重大科研计划2项(ASIRi&ARSCOP),完成理论著作1部,在《Geotechnique》、《ASCE Journal of Geotechnical and Geoenvironmental Engineering》等岩土工程国际权威期刊上发表论文120余篇,同时也是数个国际知名刊物的审稿专家。Dias教授先后获得法国Electricity of France等十数家相关公司的资助,主持或参与过South Toulon tunnel 等十余座隧道的建设以及科研项目,具有丰富相关项目管理及工程实施经验。

报告简介:

Full-face excavation associated with ground reinforcement is a common technique to build large tunnels in soft rock or hard soil. The phenomenon of the interaction between the excavation process, the reinforcements and the ground reaction is a three-dimensional (3D) problem. Currently, software and hardware developments provide the option of a numerical analysis of a 3D tunnel excavation within a reasonable calculation time; however, two-dimensional calculations based on the simplified convergence-confinement method are still the most common approach of engineers in current projects during the design phase.

This study presents the numerical back-analysis of a monitoring section setup in the southern Toulon tunnel in France. The primary goal of this study was to investigate and compare the ability of the two numerical approaches (i.e., 2D and 3D) to reproduce the real behaviour of the tunnel measured in situ. The 3D calculation correctly simulates the in situ data, confirming that this tool can represent the complexity of a tunnel excavation. Fitting the 2D calculations onto the 3D results also enabled the determination of the stress release values corresponding to the real excavation process adopted in the Toulon project. This analysis produces two-dimensional numerical results that are globally satisfactory, considering the ground displacement.