Statistical modeling for deformation analysis of concrete arch dams with influential horizontal cracks
Statistical modeling for deformation analysis of concrete arch dams with influential horizontal cracks
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水平裂缝影响混凝土拱坝变形分析统计模型
DOI：
10.1177/1475921718760309
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发表时间：
2019-03
期刊：
影响因子：
--
通讯作者：
Wu Suhua
中科院分区：
文献类型：
--
作者：
Hu Jiang;Wu Suhua
世界上有几座混凝土大坝出现了严重的裂缝。研究裂缝对大坝结构长期性能的影响，对保证大坝安全运行具有重要意义。对实测大坝位移的解释通常基于统计水静力-季节和水静力-热时间模型。本文的主要目的是提出一个统计的水静力-热-裂缝-时间模型来解释具有影响的水平裂缝的混凝土拱坝的位移。应用静压-热-裂-时模型对陈村坝进行了分析。陈村坝是一座下游面存在大规模水平裂缝的拱坝。这条裂缝水平延伸至大部分坝体。其裂缝张开位移在加固处理后仍在不断增大，并伴有拱-悬臂体系的异常变形特征。采用特殊的间隙单元，建立包含已有裂缝的三维有限元模型，再现结构响应，评估裂缝对记录运动的贡献，获得裂缝开口位移与坝顶位移之间的关系。在此基础上，建立了考虑裂纹张开位移的静水-热- cmod -时间模型。与传统模型相比，静压-热-裂纹-时间模型具有更好的拟合精度。结果还表明，裂缝和相应的加固措施对大坝的变形行为有显著影响。这可以为类似问题的混凝土结构提供一些有用的指导。
Several concrete dams all over the world exhibit severe cracks. It is very important to investigate the influence of cracks on the long-term behavior of dam structures to ensure safe operation. The interpretation of measured dam displacements is usually based on statistical hydrostatic-seasonal-time and hydrostatic-thermal-time models. The main purpose of this article is to present a statistical hydrostatic-thermal-crack-time model to interpret displacements of concrete arch dams with influential horizontal cracks. The hydrostatic-thermal-crack-time model is applied to analyze the Chencun dam, an arch–gravity dam with a large-scale horizontal crack on the downstream face. The crack stretches horizontally across most of the dam blocks. Its crack mouth opening displacement had been continually increasing even after reinforcement treatment, accompanied by abnormal deformation characteristics of the arch–cantilever system. A three-dimensional finite element model, containing the pre-existing crack using special gap elements, is built to reproduce the structural response, assess the contribution of the crack on the registered movements, and obtain the relationship between the crack mouth opening displacement and the dam crest displacement. Based on this, the hydrostatic-thermal-CMOD-time model considering crack mouth opening displacement is developed. Compared with the traditional models, the hydrostatic-thermal-crack-time model is expected to provide a better fit accuracy. The results also show that the crack and the corresponding reinforcement measure have a significant effect on the deformation behavior of the dam. This can provide some useful indications for concrete structures with similar problems.
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