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。
Abstract
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.
关键词
熵理论 /
弦长值法 /
左岸边坡 /
锦屏一级拱坝 /
预警指标
Key words
entropy theory /
chord length method /
slope at left bank /
arch dam of Jinping I /
prewarning index
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 中国电建集团成都勘测设计研究院有限公司. 雅砻江锦屏一级水电站水库初期蓄水大坝及边坡安全监测分析与评价(第三阶段蓄水)[R]. 成都:中国电建集团成都勘测设计研究院有限公司, 2014.
[2] 顾冲时, 吴中如. 大坝与坝基安全监控理论和方法及其应用[M]. 南京:河海大学出版社, 2006.
[3] SHANNON C E. A Mathematical Theory of Communication[J]. Bell System Technical Journal,1948,27(3):379-423.
[4] JAYNES E T. Information Theory and Statistical Mechanics[J]. Physical Review,1957, 106(4):620-630.
[5] 丛培江. 基于熵理论的混凝土坝裂缝分析模型研究[D]. 南京:河海大学, 2007.
[6] 伍 元. 基于熵理论的大坝安全分析评价方法研究[D]. 南京:河海大学,2010.
[7] 雷 鹏. 混凝土坝变形安全监控指标的拟定方法研究[D]. 南京:河海大学,2008.
[8] 雷 鹏, 常晓琳, 肖 锋,等. 高混凝土坝空间变形预警指标研究[J]. 中国科学: 技术科学,2009, 41(7): 992-999.
[9] 裴启涛,李海波,刘亚群,等. 基于组合赋权的岩爆倾向性预测灰评估模型及应用[J]. 岩土力学,2014, 35(1): 49-56.
[10]周惠成, 张改红, 王国利. 基于熵权的水库防洪调度多目标决策方法及应用[J]. 水利学报,2007, 38(1): 100-106.
[11]YULMETYEV R M, EMELYANOVA N A, GAFAROV F M. Dynamical Shannon Entropy and Information Tsallis Entropy in Complex Systems[J]. Physica A: Statistical Mechanics and Its Applications,2004, 314(28): 649-676.
[12]SIMOES L M C, TEMPLEMAN A B. Entropy-based Synthesis of Pretensioned Cable Net Structures[J]. Engineering Optimization, 1989, 15(2): 121-140.
基金
国家自然科学基金项目(51209077, 51139001);中央高校基本科研业务费项目(2012B07214);新世纪优秀人才支持计划资助(NCET-11-0628);高等学校博士学科点专项科研基金(20120094110005)
PDF(1596 KB)
