心墙材料各向异性对心墙坝渗流场的影响分析

Analysis on the Influence of Core Wall Material Anisotropy on Core Wall Dam Seepage Field

土石坝防渗功能的优劣主要取决于坝体材料的防渗系数。心墙坝中心墙是坝体的防渗部分,它对坝的渗透稳定起着至关重要的作用。本文结合工程实例,利用岩土工程专用软件Geo Studio建立了某心墙坝的平面有限元模型,考虑非饱和区的影响,在心墙材料各向异性的情况下,分别对其进行稳定-非稳定渗流有限元分析,探讨了渗流场的分布情况以及浸润线的变化规律。计算结果表明:由于非饱和区的存在及心墙材料的各向异性,心墙单宽渗流量和心墙下游逸出高度均增大;在非稳定渗流下,自由面变化比较明显,这些结论可以为以后的大坝结构设计以及施工提供一定的参考依据。

The leakage prevention function of earth and rockfill dam mainly depends on the leakage prevention coefficient of the dam body materials. The center wall of core wall dam is the seepage-proofing part of the dam, which plays a vital role in the seepage stability of the dam. Combined with engineering projects, the paper uses GeoStudio which is the special software of geotechnical engineering to build the plane finite element model of a core wall dam, considers the influence of the non-saturated region to analyze the stable - unsteady seepage finite element if the dam in the condition of anisotropic of the core wall materials and discusses the distribution of seepage field and the changing rule of the seepage line. The calculation results show that because of the anisotropic of the core wall materials in the non-saturated region, the single-width seepage discharge of the core wall and the escape height in the backward position of the core wall are increasing, the changes of free surface are more obvious in unsteady seepage. The conclusions can provide some references for the design and construction of the dam in the future.