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Daniel Dias: Inverse analysis on two geotechnical works——a tunnel and a cavern
发布日期:2018-06-14  字号:   【打印

报告时间2018年6月15日(星期五)18:45

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

  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。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。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,Google学术总引用次数2463次,单篇最高引用117次,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

One of the major difficulties for geotechnical engineers during project phase is to estimate geomechanical parameters values of the adopted constitutive model in a reliable way. In project phase, they are normally evaluated by laboratory and in situ tests and, in the specific case of rock masses, by the application of empirical classification systems. However, all methodologies lead to uncertainties due to factors like local heterogeneities, representativeness of the tests, etc. In order to reduce these uncertainties, geotechnical engineers can use inverse analysis during construction, using monitoring data to identify the parameters of the involved formations. 

This talk shows the back analysis of geomechanical parameters by the optimisation of a 3D numerical model of the hydroelectric powerhouse cavern of Venda Nova II built in Portugal. A French tunnel (Bois de Peu) will also be presented.For this purpose, two optimisation techniques were considered: one classical optimisation algorithm and an evolutionary optimisation algorithm. In the optimisation process, displacements measured by extensometers and stresses during excavation were used to identify the soil/rock mass parameters). Efficiency of both algorithms is evaluated and compared. Both approaches allowed obtaining the optimal set of parameters and provided a better insight about the involved soil/rock formation properties.

(孙志彬/文)  
编辑:徐小红
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