双江口大坝心墙盖板裂缝原因分析与处理措施探讨

Analysis on the Causes and Treatment Measures of Cracks in the Cover Plate of the Core Wall of Shuangjiangkou Dam

堆石坝心墙盖板混凝土产生裂缝的原因通常是由于混凝土原材料、混凝土强度等级、混凝土施工工艺及混凝土温控措施等不满足设计图纸或施工规范要求所致。双江口水电站大坝心墙盖板在排除上述设计和施工因素的情况下,对比同类工程设计与施工经验[1],出现了高地应力、温度应力、灌浆抬动、长期未填筑覆盖等多种前所未遇的复杂情况,导致大坝心墙盖板施工在不同时段出现了不同状况的裂缝。工程建设管理单位高度重视裂缝问题,多次组织专家组和参建单位人员召开专题会议,共同分析裂缝产生的原因,研究出相应的处理及预防措施并予以实施,取得了较好的效果。

The cracks in the concrete of dam core wall cover plate are usually caused by the fact that the concrete raw materials,concrete strength grade,concrete construction technology and concrete temperature control measures do not meet the requirements of design drawings or construction specifications.Under the circumstance of excluding the above design and construction factors and comparing the design and construction experience of similar projects,many unprecedented complicated situations,such as high ground stress,temperature stress,grouting lifting,long-term unfilled coverage,appeared in the cover plate of Shuangjiangkou dam core wall,causing the cracks in different conditions appeared in different periods of construction.The engineering construction management unit attaches great importance to the problem of cracks,and organizes expert groups and personnel from participating units to hold special meetings for several times to analyze the causes of cracks,study the corresponding treatment and prevention measures,and achieve good results.