填筑形象对土石坝结构性态影响的精细有限元分析

Precise finite element analysis on influence of construction appearances to earth-rock dam structural behaviors

利用数字大坝施工技术,考虑实际施工质量的空间差异性带来的坝料模型参数在空间上的差异性,通过土石坝模型参数空间估计及任意单元赋值,构建精细三维有限元模型;进而以某心墙堆石坝为例,分析在实际施工进度滞后情况下,为了在汛前填筑到度汛高程,采用不同填筑进度方案对心墙堆石坝施工期应力变形的影响。结果表明,不同施工进度形象面貌对坝体水平位移影响较大,而对竖向位移和应力影响较小。

Using the digital dam construction technology, considering the spatial difference of the constitutive model parameters caused by the spatial difference of the actual dam construction quality, a three-dimensional precise finite element model is built by estimating and valuing each element of the model. Then, a core rock-fill dam is taken as an example to analyze the influence of two possible construction schedule appearances on the dam structure behaviors. These appearances are designed to fill up to the flood-control elevation before flood season under the condition of construction schedule lagging. The result shows that the different construction appearances mainly affect the horizontal displacement, and have little effect on vertical displacement and stress. Therefore, it can provide guidance for planning the filling schedule of dam during the actual construction.