Research on Prevention of Cracks by Temperature Control in Arch Dam under the Condition of"Simultaneous Pouring and Grouting"Rapid Construction
The construction period of concrete arch dam is long and the temperature control requirement is strict.However,in order to shorten the construction period,a method called"Simultaneous Pouring and Grouting"will be applied in some circumstances.The first-stage cooling of the upper newly-built block and the second-stage cooling of the lower already-built block are performed simultaneously,which makes it difficult to control the temperature gradient.In order to analyze the temperature control method under such condition,a three-dimensional finite element model of an arch dam is established.The dam concrete temperature and stress simulated results under traditional arch construction and multiple"Simultaneous Pouring and Grouting"rapid construction cases are compared.The results show that stricter and more precise temperature control measures are needed to ensure the safety of arch dam under the condition of"Simultaneous Pouring and Grouting".The measures including a longer time slow first-stage cooling,an earlier and slower second-stage cooling,providing a third-stage cooling,a more reasonable temperature gradient,enhancing surface insulation,will be effective in controlling the dam tensile stress.The research results may provide reference for the rapid construction of similar arch dams.
concrete arch damrapid constructionsecond-stage coolingtemperature control and crack preventionsimulation analysis
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