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Analysis of Stress and Deformation for Concrete Faced Rockfilll Dam by FLAC3D-based Redevelopment

Author: WangZuQiang
Tutor: ZhangGuiJin；WeiLiDe
School: Changsha University of Science and Technology
Course: Port, Coastal and Offshore Engineering
Keywords: FLAC3D Further Development Concrete Face Rockfill Dam Duncan-Chang Constitutive Model Fast Lagrangian Analysis
CLC: TV641.43
Type: Master's thesis
Year: 2009
Downloads: 253
Quote: 3
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Abstract


Concrete faced rockfilll dam (CFRD) is the most competitive dam type that with greatpotential in dam engineering. In the early stage of the CFRD development, the designwas mainly based on engineer’s experience. Lesser systematic research works werecarried out. In recent y ears, with the progress of CFRD technology, the design andconstruction of CFRD is gradually shift from the experience based method to themore scientific based method which is mainly guided by theoretic analysis and laboratory test.For concrete faced rockfill dam, the stress and deformation properties of the dam are the most important issues that vital to dam safety and operation. Although great progresses have been achieved in China’s CFRD construction, there are also several failure cases. The breach of the Gouhou CFRD, the concrete slab collapse of the Zhushuqiao CFRD and the structure cracks in slabs of the Tianshengqiao No 1 CFRD remind us to pay much more attentions on the stress and deformation properties of CFRD. With the rising dam height of CFRD and more and more complex topographic and geologic conditions at dam site, the requirements for analysis method will be higher and higher. For high CFRD, how to predict its deformation trends, how to optimize dam design and to keep a smooth stress status of concrete slabs have become the key issues of the design. Though there are certain achievements in past research, it still lack of comprehensive and systematic study on the stress and deformation properties of CFRD. The research on this aspect will not only has important academic significance, but also has great practical values in engineering application.The simulation methods were discussed for CFRD while constructing phase and storing water phase, and some new views were conducted for discontinuous deformationat the two sides of the slab joints and the contact between the concrete slab and thecushion.According to the further developing platform, the Duncan-Chang constitutive model is developed in FLAC3D with VC++ environment.Then according to the data of typical conventional triaxial compression tests and the theory results of Duncan-Chang constitutive model, the verifications show that the redevelopment is successful and the program codes have some obvious advantages with high efficiency,high precision, and are easy to be maintained.A case study of CFRD’s deformation and stress analysis used the redevelopment was introduced and showed some powerful capacities to solve engineering problems.All the schemes proposed in this thesisstrong utility to nonlinear analysis of deformation and stress for CFRD and are cable of reference to numerical simulationresearch for geoengineering, hydropower structures and other engineering fields.

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CLC: > Industrial Technology > Hydraulic Engineering > Water control,hydraulic structures > Dams > Earth dam (local material dams, fill dams ) > Rockfill dam > Reinforced concrete faced rockfill dam
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