【摘要】 面板开裂导致渗漏是混凝土面板堆石坝最常见的病害之一，严重时甚至会引起溃坝事故。为了准确定位混凝土面板渗漏位置，提出了基于光纤布拉格光栅(FBG)传感技术的点热源(PHS)渗漏监测方法，利用点热源(PHS)在垫层中的降温特性来进行面板渗漏监测。为验证该方法的有效性，设计了混凝土面板堆石坝渗漏监测的模型试验，考虑渗漏通道位置、数量及蓄水水位影响，分别开展了六种不同工况下的渗漏监测试验，根据PHS的降温时程曲线定义渗漏判别指标，然后利用判别指标的分布定位面板渗漏位置。试验结果表明:越靠近面板渗漏位置，得到的判别指标变化越显著，对于渗漏更为敏感。通过相邻FBG监测结果能够确定渗漏发生的范围。识别结果与实际渗漏状态吻合，验证了该方法的可行性。更多还原

【Abstract】 Leakage caused by cracks of face slab is one of the most common diseases of concrete face rockfill dams,which may even result in dam-break accident in serious cases. To accurately locate leakage positions of concrete face slabs,a point heat source( PHS)leakage monitoring method based on fiber Bragg grating( FBG) sensing is proposed. To verify the effectiveness of the method,a model experiment of leakage monitoring for concrete face rockfill dam is designed. Considering the effects of seepage channel position,quantity,and water level,the leakage monitoring experiments in six different conditions are carried out respectively. According to the leakage discriminant index defined with the cooling time history curve of PHS,the face slab leakage positions are located according to the index distribution. The experimental result indicates that the discriminant index changes significantly and is sensitive to leakage when close to the slab leakage positions. Via the monitoring data from adjacent FBGs,the leakage area is determined. The identification result is consistent with the actual leakage state,which verifies the feasibility of this method.更多还原