数字化施工下高心墙堆石坝结构性态精细数值模拟研究

刘东海; 陈辉

doi:10.11779/CJGE201903006

数字化施工下高心墙堆石坝结构性态精细数值模拟研究 English Version

刘东海,
陈辉

天津大学水利工程仿真与安全国家重点实验室,天津 300354

基金项目: 国家自然科学基金创新群体研究项目（51621092）; 国家自然科学基金面上项目（51479132,51679164）

详细信息

作者简介:
刘东海(1974- ),男,教授,博士生导师,主要从事水利水电工程数字化施工、大坝施工质量评估与安全分析方面的研究。E-mail: liudh@tju.edu.cn。

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出版历程
- 收稿日期: 2018-01-28
- 发布日期: 2019-03-24

Refined numerical simulation of structural behaviors for high core wall rockfill dams based on construction digitization

State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300354, China

摘要

摘要: 为考虑实际施工质量对堆石坝结构性态的影响,提出了数字化施工下高心墙堆石坝结构性态精细数值模拟分析方法。首先,基于数字化施工技术估计得到了大坝任意位置处的坝料压实质量。其次,通过室内试验,建立了坝料压实质量与力学模型参数的回归关系模型,从而实现大坝任意位置处模型参数的空间估计。在此基础上,通过程序开发,实现了任意单元计算模型参数的精细赋值。最后,采用精细有限元模型实现了高心墙堆石坝应力变形的数值模拟,并采用精细扩展有限元模型实现了心墙蓄水期可能水力劈裂的预测模拟。计算结果显示该方法可以更好地反映大坝施工过程的变形情况,提高了计算的准确性。该方法充分考虑了大坝实际施工质量下坝料力学参数在空间上的差异性,克服了传统方法采用同分区相同坝料力学参数而导致的计算精度不足的弊端。
- 心墙堆石坝 /
- 数字化施工 /
- 参数空间估计 /
- 精细模拟 /
- 扩展有限元 /
- 心墙劈裂
Abstract: In order to consider the impact of actual construction quality on the structural behaviors for high core wall rockfill dams, a refined numerical simulation method for analyzing the structural behaviors of rockfill dams based on construction digitization is proposed. Firstly, the construction quality at any location of the dam is estimated by utilizing the construction digitization technologies. Secondly, the regression models between dam compaction quality and the model parameters are established using the samples of laboratory tests. Then the spatial estimation of model parameters at any dam location is achieved. On this basis, these parameters of each element are assigned by program development. Finally, the refined finite element simulation is proposed for analyzing the stress and deformation of high core wall rockfill dams. And the refined extended-finite-element simulation is presented for predicting the potential hydraulic fractures of high core wall. The calculated results show that the proposed method represents the structural behaviors more objectively and accurately, and it fully considers the spatial differences in mechanical model parameters resulting from the spatial difference in actual construction quality, thus representing an improvement in accuracy from the conventional methods which typically assign the same parameter values to the elements of the same dam zone.
- core wall rockfill dam /
- construction digitization /
- spatial parameter estimation /
- refined simulation /
- extended finite element method /
- hydraulic fracture of core wall

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参考文献(18)

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