数字化施工下堆石坝模型参数空间估计及赋值

Spatial estimation and assignment of finite element model parameters for rockfill dams under digitized construction

基于数字化施工技术实时采集的堆石坝碾压参数信息,可估计大坝任意位置处的坝料压实质量。通过室内大型三轴试验,建立了堆石坝坝料压实质量与邓肯–张模型参数的定量关系,进而可以实现大坝任意位置处的力学模型参数的空间估计。在此基础上,通过Abaqus软件二次开发,实现了能反映实际压实质量的每个计算单元本构模型参数的赋值。本文方法考虑了堆石坝实际施工质量的空间差异性而带来的坝料模型参数在空间上的差异性,可避免通常同一分区采用相同坝料力学参数可能导致的计算精度不足的弊端,从而为后续有限元精细分析堆石坝的应力变形提供前提条件。

The compaction quality of rockfill dams at any location can be estimated based on the information of compaction parameters timely acquired with the support of the digitized construction technology. According to the results of laboratory large-scale triaxial tests, the quantitative relationship between dam compaction quality and Duncan-Chang constitutive model parameters is established. Then the spatial estimation for the model parameters at any location of rockfill dams can be achieved. On this basis, the parameters of each finite element, which can reflect the actual conditions of dam compaction quality, are assigned through customizing the Abaqus software. The proposed method considers the spatial difference of the constitutive model parameters caused by the spatial difference of actual dam construction quality, so it can avoid the low accuracy of the conventional methods which usually make assignment of the same parameters for the elements in the same dam zone, but provide a prerequisite for fine and realistic finite element analysis on the stress and deformation of rockfill dams in the future work.