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针对面板堆石坝面板在施工过程及蓄水时的实际受力变形特点,对面板的开裂机理进行了深入探讨。通过分析发现,混凝土干缩和温度应力是造成面板早期细小裂缝产生的主要因素,而坝体变形所造成的对面板的剪切挤压力、面板的自重以及施工期反向水压力则是造成面板后期呈规律性开裂的主要因素。为改善面板的受力条件,提高面板的防渗能力,同时方便施工,从材料、结构和施工三个方面提出了防止措施的建议。
In view of the actual deformation characteristics of the concrete facing rockfill dam during construction and water storage, the cracking mechanism of the concrete faced rockfill dam is discussed in depth. Through analysis, it is found that the shrinkage and temperature stress of concrete are the main factors that cause the early small cracks in the panel. The shear squeezing force of the panel, the weight of the panel and the reverse water pressure caused by the deformation of the dam are caused by the dam deformation Late panel was the main factor of regular cracking. In order to improve the stress conditions of the panel and improve the anti-seepage ability of the panel, at the same time, it is convenient to construct and put forward the suggestions of preventing measures from the aspects of material, structure and construction.