摘要:
介绍了安哥拉Gandjelas重力坝的现场调查、检测、试验和理论分析的方法、依据和主要结论。检测表明,原混凝土的水平施工缝张开,层间施工质量难以保证;复核计算表明大坝整体稳定略显不足,坝体应力分布符合DL5108—1999《混凝土重力坝设计规范》规定。为综合解决整体稳定不足、渗漏和外观缺陷等影响正常运行的问题,建议在大坝上游面采用预应力岩锚加固,上游面裂缝采用灌浆、嵌缝和使用水泥结晶防渗材料处理等综合措施,下游溢流面采用20mm丙乳砂浆修补,廊道内裂缝进行EA改性环氧灌浆材料灌浆处理。
关键词:
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病害检测
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安全评估
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混凝土
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重力坝
Abstract:
Inspection,analysis and reliability theories and methods for Gandjelas gravity dam are introduced in this paper.It is indicated that construction joints are the main cracks in the concrete gravity dam,with the depth of the main cracks being about 600 mm,and the depth of minor cracks being 200 mm.The integrity of the dam is deceased by cracks of upstream face and corridor,and leakage inevitably occurred after water level rising.Integral stability and reliability of the gravity dam is slightly deficient,and the stress distributions of the dam body correspond with "DL5108-1999 Design Specification for Concrete Gravity Dams".Considering structural safety,function and durability,horizontal construction joints are reqarded as dangerous cracks,which need to be repaired.Pre-stress anchor system and anti-permeation system are proposed to solve the delaminating of construction joints and dam leakage.NBS mortar is introduced on the spillway for repair and maintenance,and grouting permeability reducing admixture is used to repair the horizontal construction joints and cracks on the wall of the corridor.
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