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长期的工程实践,对大坝混凝土的温度控制有了更深刻的认识,也会有不同的体会,近年发表不少讨论文章。作者拟从坝块的基础温差控制方面提出分析和看法。基础对坝块存在约束,对约束条件进行全面的分析,将有利于合理的控制。本文对混凝土与基岩为不同力学模式、坝块为不同高宽比、基岩与混凝土为不同弹模比的情况进行了分析,提出约束系数的表达式,同时对考虑地温变化的影响进行了探讨。在此基础上,并提出用模拟坝块实际降温作用于混凝土的极限拉伸变形作参数,建立强度条件,确定基础允许温差的看法。
Long-term engineering practice, the dam concrete temperature control have a more profound understanding, there will be different experiences, published in recent years, many articles. The author intends to put forward the analysis and opinions on the basis of temperature difference control of dam block. Basis on the dam there is a constraint, a comprehensive analysis of the constraints will be conducive to reasonable control. In this paper, different mechanics modes of concrete and bedrock, different height-width ratio of bedrock and different elastic modulus ratios of bedrock and concrete are analyzed, the expression of constraint coefficient is proposed, and the influence of considering the change of ground temperature Discussion. On the basis of this, it is proposed that the actual tensile strength of concrete dam should be simulated as the limit tensile deformation parameter, the strength condition should be established, and the view of allowable temperature difference should be established.