数字化施工下高心墙堆石坝结构性态精细数值模拟研究

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

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。

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.