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Calculation Research on Temperature Control at RCC Overflow Section of Some Hydropower Station

Author: QiaoYong
Tutor: LiShouYiï¼›MiaoShuYing
School: Xi'an University of Technology
Course: Hydraulic Engineering
Keywords: RCC Temperature control Temperature field Temperature stress
CLC: TV642.2
Type: Master's thesis
Year: 2008
Downloads: 20
Quote: 0
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Abstract


Temperature stress and structure, climatic conditions, construction methods, material properties of a variety of factors such as the large concrete structures are closely related. The temperature field and thermal stress analysis, temperature control and crack control measures research has important theoretical significance and practical value. Based on the characteristics of the heat conduction theory and the theory of elasticity, consider the creep of concrete structures, using the grid method for modeling three-dimensional finite element method floating roller compacted concrete dam construction process simulation calculation of temperature field and temperature stress. Adiabatic temperature rise of concrete, modulus of elasticity, creep, and autogenous volume deformation with the age of the change, and layered pouring summer downtime, external temperature changes, water cooling and impoundment factors are taken into account in the calculation dam temperature field and thermal stress. According to a hydropower station in the RCC spillway section construction process, the material thermodynamic test parameters, the outside temperature, impoundment, through specific measures such as water cooling, and the surface of the insulation, construction and operation on the preliminary design stage construction program of temperature field and thermal stress field simulation gives a contour map of the construction and operation periods at different times of the temperature and temperature stress contour diagram, graph of the the typical point temperature and stress lasted; given the basis of normal concrete pad layer region, the foundation the strong constraints District, the underlying weak constraint non-binding area of ??the highest temperature, the maximum temperature and maximum temperature stress; analysis of the different construction plans the construction and operation of the dam temperature field and thermal stress distribution law proposed recommended construction program to meet the design specifications of the concrete gravity. Different construction schemes temperature field and temperature stress distribution law shows that the basis of normal concrete cushion zone temperature stress is relatively large local tensile stress exceeds normal concrete age of 180 days to allow the anti-cracking stress, temperature control needs to be strengthened in the region measures. Recommended program in addition to the basis of normal concrete cushion zone temperature stress, local tensile stress exceeds the basis of normal concrete age of 180 days to allow anti-cracking stress, the largest dam in other parts of the temperature difference, the temperature difference between inside and outside and the maximum temperature stress to meet the design requirements . The research results of the hydropower station temperature control designed to provide a basis for roller compacted concrete spillway section. Important reference significance on similar projects thermostat design and construction program.

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CLC: > Industrial Technology > Hydraulic Engineering > Water control,hydraulic structures > Dams > Concrete dam > Roller compacted concrete dam
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