基于改进遗传算法的垫层区混凝土热学参数反演和早期裂缝成因分析  

Inversion analysis of thermal parameters of cushion concrete and reasons of early stage cracks based on improved genetic algorithms

作　　者：孙伟[1] 何蕴龙[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2014年第2期193-200,共8页Engineering Journal of Wuhan University

摘　　要：温度控制设计对于减小大体积混凝土开裂风险和大坝安全具有重要意义.然而,由于大体积混凝土结构施工期间受多种随机因素的影响,设计阶段仿真计算结果往往与施工现场差别较大.充分利用施工现场实时监测数据进行反馈分析是解决此问题的有效途径.引入模拟退火算法中的Metrolpis接受准则,对简单遗传算法早熟现象加以改进,详细阐述了自动调用三维有限元温度场正分析模块进行热学参数反演分析的方法和步骤.采用改进遗传算法对呼和浩特抽水蓄能电站拦沙坝6号坝段垫层区混凝土进行热学参数反演分析,结果表明,改进遗传算法能够有效地避免简单遗传算法的早熟现象,反演结果能够较为真实地反映施工现场垫层区混凝土温度场变化过程,并在此基础上,对垫层区混凝土出现的早期裂缝成因进行了分析.The design of temperature control is of significance to reduce the risk of cracks of mass concrete and make sure the safety Of the dam. However, the mass concrete structures influenced by a variety of random factors during construction; the simulation results in the design stage always can＇t reflect the process of change in the real construction site. Taking full advantage of the data in real-time monitoring of the construction site to do inversion analysis is an effective way to solve this problem. The accepted guide- line of Metrolpis in the simulated annealing algorithm is introduced to solve the precocious phenomenon of simple genetic algorithm and the methods to call the temperature field of three-dimensional finite element analysis module for the inversion analysis of the thermal parameters automatically are detailed. Taking the cushion zone concrete of dam Section #6 in Hohhot Pumped Storage Power Station sediment control dams for example, the sequences of measuring point temperature are in good agreement with the measured val- ues; and the results reflect well the real process of change of the cushion zone concrete temperature field. On basis of this, the reasons of the early stage cracks in cushion zone concrete have been analyzed.

关 键 词：改进遗传算法 反演分析 有限元 垫层 早期裂缝 

分 类 号：TV315[水利工程—水工结构工程]