Research on New Dam Structure for High Earth Core Rockfill Dam on Thick Overburden
Research on New Dam Structure for High Earth Core Rockfill Dam on Thick Overburden
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DOI：
10.1061/9780784413128.038
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发表时间：
2013-11
期刊：
影响因子：
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通讯作者：
Han Xu;Bin Huang;Xibao Rao;Jia-jun Pan;Yun Chen
中科院分区：
文献类型：
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作者：
Han Xu;Bin Huang;Xibao Rao;Jia-jun Pan;Yun Chen
对于建在深厚覆盖层上的高心墙堆石坝，传统的防渗体系设计和施工是先筑基础防渗墙，再在防渗墙顶修建刚性或柔性连接灌浆廊道，然后用高塑性粘土覆盖廊道。因此，施工后，高坝体通过廊道向防渗墙传递了很大的压力。为此，提出了一种在深厚覆盖层上修建高心墙堆石坝的新结构形式，即在覆盖层上修建一个带有大尺寸廊道的“混凝土板”，在坝体施工期间或施工结束后，从大尺寸廊道的内侧修建防渗墙，以减小防渗墙的应力。防渗墙和覆盖层上的混凝土板与上坝体一起构成了一个完整的防渗体系，但在实际大坝建设中尚未采用。本文对一座223 m高的厚覆盖层上的心墙堆石坝进行了二维有限元应力和变形分析，以评估混凝土板和防渗墙施工顺序的影响。通过计算，得到了混凝土面板的应力和变形，并对其结构安全性和在心墙堆石坝中的适用性进行了评价。研究结果表明，通过合理调整坝体和防渗墙的施工顺序，可以控制传统结构难以解决的防渗墙压应力问题。体现了新结构的优势。
For high earth core rockfill dam constructed on thick overburden, traditional anti-seepage system design and construction is to construct the foundation seepage cut-off wall first, and then build a rigid or soft-connected grouting gallery on top of seepage cut-off wall, and then cover the gallery with high plastic clay. Therefore, after the construction, the high dam body transmits great pressure to the seepage cut-off wall through the gallery. For this reason, a new type of structure for high earth core rockfill dam constructed on thick overburden is proposed, namely constructing a “concrete slab” with a large dimension gallery on the overburden, so that the seepage cut-off wall can be constructed from the inside of the large dimension gallery during or after construction of the dam body to reduce the stresses in the cut-off wall. The cut-off wall and the concrete slab on the overburden, together with the upper dam body, form a complete anti-seepage system, but it has not been used in actual dam construction. In this paper, two-dimensional finite element stress and deformation analyses were carried out to assess the effects of the proposed concrete slab and cut-off wall construction sequence on a 223-meter high earth core rockfill dam constructed on thick overburden. The stresses and deformations of the concrete slab are obtained, and its structural safety and suitability for use in earth core rockfill dam are also evaluated. According to research results, by rationally adjusting the construction order of the dam body and the cut-off wall, the compressive stresses on the cut-off wall can be controlled, which has been a big problem for traditional structures. It reflects the advantage of the new structure.