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观音阁水库库区地处严寒地带,气候条件恶劣,每年的冬季有5个月不能浇筑混凝土。1994年2~4月间,现场发现部分坝段越冬面上的水平施工缝张开,最大深度达(3~6)m。为研究裂缝的形成过程及发展趋势,确保今后越冬面不出现裂缝,用有限单元法对观音阁大坝的典型坝段按现场实际情况,进行了施工期至运行期的温度及温度徐变应力的仿真分析及预测计算分析,研究了避免新浇混凝土施工期及运行期产生裂缝的温控条件及措施。
Guanyinge reservoir area is located in the cold area, the harsh climatic conditions, annual winter 5 months can not pour concrete. Between February and April 1994, some horizontal construction joints on the overwintering surface of partial dam sections were found on site with the maximum depth of (3 ~ 6) m. In order to study the formation process and development trend of cracks and ensure that there will be no cracks in the overwintering area in the future, the finite element method is used to analyze the temperature and temperature creep stress during the construction period to the operation period according to the actual conditions of the typical dam section of Guanyinge Dam The simulation analysis and prediction calculation and analysis were carried out to study the temperature control conditions and measures to avoid cracks during the construction and operation of fresh concrete.