基于熵理论的锦屏一级拱坝空间变形预警指标拟定研究

锦屏一级拱坝已建成处于初次蓄水阶段,由于左岸边坡的持续变形对坝体弦长变形有一定影响,为使工程安全运行,拟定了弦长的空间变形预警指标。先利用改进的熵值法求得各测点的熵权,然后由信息熵的定义给出单测点变形熵的表达式,在此基础上再构建各测点的空间变形熵,最后运用最大熵理论给出了弦长空间变形熵的概率密度函数,并对弦长空间变形熵预警指标进行了拟定,结果表明该方法高效可行,可为大坝安全运行提供参考。

Determination of Prewarning Index for Spatial Deformation of High Arch Dam in Jinping I Hydropower Station Based on Entropy Theory

Jinping I high arch dam has been constructed and is in the first impoundment period. But the persistent slope deformation at the left bank is affecting the chord length of the dam. In order to guarantee safe operation of the project, we determine space deformation about chord length as prewarning index. First of all, we calculate the entropy weight of each measured point by modified entropy method. Then we give the expression of deformation entropy of single measured point based on information entropy. On the basis of this, we establish the entropy of space deformation of each measured point. At last, we use the maximum entropy theory to generate the probability density function of space deformation entropy of chord length , and determine the prewarning index of the entropy. The results indicate that this method is highly effective and practicable, and provides reference for the safe operation of dam.