椭圆-抛物线双屈服面流变模型的应用与研究

发布时间：2018-04-17 11:56

本文选题：堆石料 + 双屈服面流变模型　；参考：《水力发电学报》2017年01期

【摘要】：堆石料具有剪胀、剪缩和流变等特性,堆石料流变严重影响高土石坝心墙、面板等结构的受力变形。为此结合室内试验,建立了一个考虑堆石流变特性的双屈服面流变模型。本文以水布垭面板堆石坝为例,采用双屈服面流变模型对坝体沉降变形、面板应力和挠度进行分析。计算结果表明:该模型能够综合反映复杂加载情况下堆石料剪胀、剪缩和流变特性;流变对坝体及面板的应力变形呈增大效应;200 m以上的高坝满蓄后5年左右流变效应仍未完全趋于衰减稳定;流变对面板拉应力的影响较大,轴向拉应力增幅达30%,顺坡向则次之;对比现场观测资料,自然界日晒雨淋过程会对堆石长期变形产生影响,现有的流变计算中均忽略了此类因素的影响,导致计算结果小于实测结果。
[Abstract]:The heaps have the characteristics of shear expansion, shearing shrinkage and rheology, and the rheology of rockfill has a serious effect on the deformation of the core walls and face panels of high earth and rock dams.A double yield surface rheological model considering the rheological properties of rockfill was established.Taking Shuibuya concrete face rockfill dam as an example, the deformation, stress and deflection of face slab are analyzed by using the rheological model of double yield surface.The results show that the model can comprehensively reflect the shear expansion, shearing shrinkage and rheological properties of rockfill under complex loading.The rheological effect on the stress and deformation of the dam body and face slab is larger than 200 m, and the rheological effect of the high dam about 5 years after full storage is still not completely attenuated and stable, and the rheological effect on the tensile stress of the face slab is greater, with the increase of axial tensile stress reaching 30%, followed by the downhill direction.Compared with the field observation data, the natural process of sun and rain will affect the long-term deformation of rockfill. The influence of this kind of factors is neglected in the present rheological calculation, which results in the calculation result smaller than the measured result.
【作者单位】：江苏省水利勘测设计研究院有限公司;南水北调东线山东干线有限责任公司;
【分类号】：TV641.43

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