用原型观测资料推求大坝混凝土的力学参数

Elastic constants of dam concrete back analysed by prototype observed data

本文讨论了从变形观测资料推求大坝混凝土弹性模量和热膨胀系数的方法及其成果。讨论指出:采用反演法推求力学参数时只存在近似解,反演成果也易受多种因素影响。 本文还给出了若干工程的估算成果、探讨了负温时大坝混凝土热膨胀系数剧增等现象,它们对改进大坝设计、施工、管理具有重要意义和参考价值。

The procedures and results for back analysis of the elastic moduli and thermal expansive coefficients of dam concrete are discussed in this paper.It is pointed out that back analysis can only give an approximate assessment of the material parameters because the assessment is affected by many factors.Application of back analysis to several dams is presented,it shows that the thermal expansive coefficient will increase abruptly,if the dam temperature is below zero degree centigrade.These findings are valuable for the design and maintenance of concrete dams.