Research on Perfoliate Crack and It's Stability of the Xifengjiang Reservoir Dam
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摘要: 1962年3月19日新丰江水库大坝附近发生MS 6.1级强烈地震后，13-17#坝段在108.5m高程处出现了长达82m的贯穿裂缝，导致水库渗漏，其后虽进行了加固处理，但经过50多年的运营，贯穿裂缝的现状如何，备受各级政府及专家学者的关注。本文利用近些年大坝上的多次小震观测记录，通过对有无贯穿裂缝坝段的地震加速度时程傅氏谱及上下坝体传递函数的对比分析，对14#坝段的整体性和稳定性进行了系统研究。结果表明，到目前为止，大坝贯穿裂缝没有明显恶化，但整体性依然较差，仍然是大坝稳定性的最大隐患。Abstract: On March 19, 1962, a strong earthquake of magnitude 6.1 occurred near the Xinfengjiang reservoir dam. It generated a 82m length perfoliate crack at the height of 108m at the dam sections from No. 13 to No 17. The perfoliate crack caused leakage of reservoir water. Although the dam has been reinforced, how the perfoliate crack develops after more than 50 years becomes the concerned focus at all levels of governments, experts and scholars. In this paper, the integrality and stability of the No. 14 dam body has been evaluated through comparative analysis by Fourier spectrum of seismic acceleration on the dam within and outside the perfoliate crack region and transfer function of the top and bottom dam section. By far, the perfoliate crack of the dam has no obvious deterioration yet, but the dam integrality is still not so good and will be the main potential weakness of the dam.
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Key words:
- The Xinfengjiang reservoir dam /
- Perfoliate crack /
- Stability
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图 1 新丰江水库大坝强震动台阵测点布置图
红色实线为贯穿裂缝所在位置；蓝色框内为分析所用坝段
Figure 1. The set-up of strong motion array of the Xinfengjiang reservoir dam
图 2 新丰江水库大坝和地震震中分布图
Figure 2. Distribution of the earthquake epicenters near Xinfengjiang reservoir dam
图 3 23通道8次地震加速度记录
（a）2014-05-24 3.3级（b）2014-06-20 3.0级（c）2014-07-11 3.0级（d）2015-03-05 2.8级（e）2014-08-10 2.9级（f）2015-04-29 2.9级（g）2014-04-25 3.8级（h）2014-07-11 4.0级
Figure 3. Acceleration time histories of 8 earthquakes from the 23th channel
图 4 5#坝段坝轴向通道在8号地震中的加速度时程及傅里叶谱
（a）10通道加速度时程（b）43通道加速度时程（c）10通道加速度傅里叶谱（d）43通道加速度傅里叶谱
Figure 4. Acceleration time history and Fourier spectrum of No.8 earthquake from No.5 dam axial channel
图 5 14#坝段坝轴向通道在8号地震中的加速度时程及傅里叶谱
（a）22通道加速度时程（b）31通道加速度时程（c）22通道加速度傅里叶谱（d）31通道加速度傅里叶谱
Figure 5. Acceleration time history and Fourier spectrum of No.8 earthquake from No.14 dam axial channel
图 6 5#坝段坝轴向通道对应7号地震中的加速度时程及傅里叶谱
（a）10通道加速度时程（b）43通道加速度时程（c）10通道加速度傅里叶谱（d）43通道加速度傅里叶谱
Figure 6. Acceleration time history and Fourier spectrum of No.7 earthquake from No.5 dam axial channel
图 7 14#坝段坝轴向通道对应7号地震中的加速度时程及傅里叶谱
（a）22通道加速度时程（b）31通道加速度时程（c）22通道加速度傅里叶谱（d）31通道加速度傅里叶谱
Figure 7. Acceleration time history and Fourier spectrum of No.7 earthquake from No.14 dam axial channel
图 8 5#、14#坝段对应8个地震情况下三分向的传递函数及平均值曲线图
（a）5#坝段坝轴向（b）14#坝段坝轴向（c）5#坝段顺河向（d）14#坝段顺河向（e）5#坝段竖向（f）14#坝段竖向
Figure 8. Transfer function of three components and their average of section No.5 and No.14 under 8 earthquakes
表 1 新丰江水库附近8次有记录的地震
Table 1. Eight recorded earthquakes near Xinfengjiang reservoir
序号 发震时间 纬度/°N 经度/°E 震级/MS 深度/km 到大坝的距离/km 1 2014-05-24 12:33:04 23.45 114.38 3.30 13 41.45 2 2014-06-20 05:30:45 23.43 114.42 3.00 8 40.58 3 2014-07-11 02:25:48 23.43 114.43 3.00 7 39.98 4 2015-03-05 15:54:50 23.45 114.37 2.80 12 42.14 5 2014-08-10 14:38:48 23.43 114.43 2.90 8 39.97 6 2015-04-29 10:35:25 23.43 114.36 2.90 7 44.46 7 2014-04-25 16:07:10 23.54 114.29 4.40 10 42.46 8 2014-07-11 13:43:24 23.54 114.28 4.50 10 43.35 
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