Simulation Analysis of Temperature Control of Overflow Dam Section of Shangyi RCC Gravity Dam
Due to the fast rise of the RCC dam pouring elevation,the heat dissipation is not timely,coupled with the low tensile strength in the initial stage of RCC pouring,there will be a large tensile stress in the cooling and cooling process of the concrete dam,especially for the cold areas in winter the temperature is low,the cooling speed is too fast,the temperature difference between inside and outside is large,and the cracking problem of the dam body is more severe and prominent.The process of construction and operation of the overflow dam section of Shangyi RCC gravity dam was simulated by three-dimensional finite element software.The temperature field and temperature stress field of the overflow dam section were analyzed,especially for the overflow surface part of high-grade concrete,and the corresponding temper-ature control measures were improved.The results show that the temperature control problem of RCC dam in cold areas is prominent,and the temperature rise of the concrete poured in summer is too high under only surface insulation meas-ures,and the internal temperature stress of the dam exceeds the standard,and the temperature and temperature stress of the C30 concrete on the overflow surface poured synchronously with the dam body greatly exceed the allowable range.Af-ter the improved temperature control measures were adopted,the overall temperature stress of the dam body was effec-tively controlled.The overflow surface temperature and temperature stress conditions were greatly improved after adjus-ting the pouring plan,which reduced the risk of cracking in cold weather.
RCC damsoverflow surfacetemperature stresstemperature control measures
万方数据
维普
