SYNOPSIS
In CFRD (Concrete Faced Rockfill Dam) engineering, prediction of performance of the dam is very important for structure design and determination of construction schemes. In recent years, more and more high CFRD projects will be constructed and the topographic and geologic conditions of dam site are also more and more complicated, which have brought great challenges for the theoretic modelling and analytic method of the numerical analysis of CFRD. The talk focuses on the numerical modelling and computation methods for stress and deformation analysis of CFRD. With the discussion on engineering properties of rockfill material, the constitutive models for simulating stress-strain relationship of rockfill materials will be introduced, which include nonlinear elastic models, elasto-plastic models and the models for creep deformation. Numerical analysis on the stress and deformation properties of CFRD is conducted by finite element method. For CFRD, the computation method should consider the non-linear stress strain features of rockfill materials. In addition, the interface of concrete face slabs and rockfill should also be well simulated, as the non-linear contact properties of concrete and rockfill will have significant impacts on the stresses of concrete slabs. For high CFRD, the creep deformation of rockfill will be an important factor to be considered. Base on the mathematic models for creep deformation of rockfill, the correspondent computation method is developed to take into account the influences of the impacts of rockfill creep deformation. With the introduction of the theoretic models and computation methods for the numerical analysis of CFRD, several typical cases will be presented to illustrate the stress and deformation features of CFRD in different conditions. Furthermore, the latest technologies and developing trends for numerical analysis of CFRD will be discussed.
BIODATA OF SPEAKER
Prof. Dr Zeping Xu, is a professor and senior engineer of China Institute of Water Resources and Hydropower Research. He graduated in Engineering Mechanics from Hohai University, China, in 1984, and then completed post-graduate course in Geotechnical Engineering and got PhD degree in China Institute of Water Resources and Hydropower Research (IWHR). He has more than 20 years of experience in the field of dam engineering, especially in rockfill dam engineering, working as researcher, dam engineer and engineering consultant.
He is the chairman for the Technical Committee on Embankment and dams (TC210) of International Society for Soil Mechanics & Geotechnical Engineering (ISSMGE), deputy secretary general of Chinese National Committee on Large Dams (CHINCOLD) and vice director of the technical committee of CFRD in China. He is also ICOLD technical committee member on dam safety and capacity building. Dr Xu mainly focuses on the studies of rockfill dam engineering, numerical analysis of geotechnical engineering, geotechnical testing, centrifuge modelling and assessment of dam safety. He has been keynote speaker of several international conferences and symposiums. He is the general reporter of Question 98 of the 25th ICOLD conference (Stavanger, Norway, 2015).
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