为实现渗透溶蚀对高混凝土坝长期变形影响的量化分析,以累积Ca2+溶蚀量为中间指标,提出了室内快速溶蚀试验所得材料性能演变规律到现场混凝土坝的应用方法;在此基础上,引入环境损伤因子,构建了考虑环境损伤的高混凝土坝非定常时变本构模型,并推导了其黏性应变增量的计算方法。某高拱坝计算结果表明:坝体混凝土的渗透溶蚀导致大坝位移年极值及极值间年变幅均增大,溶蚀100 a后坝顶径向位移增加1.7%,而实测位移HST统计模型所得拟合均方差与最大位移的比例为2.1%,由此表明溶蚀引起的长期位移增量容易被环境荷载的波动及监测误差等因素所隐蔽,进而在研究混凝土坝长期变形时,可不单独考虑坝体混凝土渗透溶蚀的影响,但应注重研究能反映大坝变形时空特征转异的监控分析方法。
Abstract
To quantitatively analyze the effect of leakage dissolution on the long-term deformation of high concrete dams, we put forward the method of applying the performance evolution law of concrete obtained from indoor rapid dissolution test to the on-site concrete dam engineering with accumulated Ca2+ loss as the intermediate index. On this basis, we established the variable parameters-based time-dependent constitutive model for dam concrete considering environmental damage factor, and derived the expression of viscoelastic strain increment. Calculation result of a high concrete arch dam unveil that the leakage dissolution of dam concrete leads to the increase of annual extreme values of dam displacement as well as the amplitude between annual maximum and minimum values. After 100 years of leakage dissolution, the radial displacement of dam crest increases by 1.7%, while the ratio of fitting mean square deviation to maximum displacement obtained by HST statistical model of measured displacement is 2.1%, indicating that the long-term displacement increment caused by leakage dissolution is easily concealed by the fluctuation of environmental loads and monitoring errors. Therefore, when studying the long-term deformation of concrete dams, it is not necessary to independently consider the influence of dam concrete’s leakage dissolution; but more attentions should be paid to the abnormality of the temporal-spatial characteristics of dam deformation behavior.
关键词
高混凝土坝 /
渗透溶蚀 /
长期变形 /
环境损伤因子 /
非定常时变本构模型
Key words
high concrete dam /
leakage dissolution /
long-term deformation /
environmental damage factor /
variable parameters-based time-dependent constitutive model
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