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首页> 外文会议>International Congress on Conservation and Rehabilitation of Dams, Nov 11-13, 2002, Madrid, Spain >Experimental investigations and numerical modeling for the analysis of AAR process related to Poglia dam: Evolutive scenarios and design solutions
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Experimental investigations and numerical modeling for the analysis of AAR process related to Poglia dam: Evolutive scenarios and design solutions

机译：与Poglia大坝有关的AAR过程分析的实验研究和数值模型：演化场景和设计解决方案

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摘要

Among the different evolutive deterioration processes for dam materials, recently in Italy Alkali Aggregate Reaction (AAR) phenomena are becoming more and more important. A particularly meaningful case is represented by Poglia dam. This structure, which owner is Edison S.p.A., is a hollow gravity Marcello type dam (located in Lombardia region), which aim is the hydroelectric power generation. Since seventies some measurements have shown a slow drift in elevation and, secondarily, in downstream-upstream direction and for this reason the owner has started some investigations in order to reach a clear explanation of the causes. After a careful examination of the reliability of the measurements (levelling, colli-mation, pendulums, extensometers, etc.) and having excluded the existence of problems related to the stability of foundation and abutments, the possible presence of expansive phenomena has been explored. To this aim a deep in situ and laboratory campaign has been carried out and the presence of the AAR phenomena has been detected. The phenomena have a moderate entity but, due to the non-rectilinear shape of the longitudinal dam axis and to the peculiar geometry of the dam blocks, a stress-strain state has taken place in the dam body which deserves attention particularly in the zones closer to the variation of direction of the dam axis. Thanks to the availability of a particularly advanced finite element computer program (CANT-SD: three-dimensional, non linear, capable to simulate the expansion AAR phenomena) calibrated on the basis of the measurements recorded on the dam, different evolutive scenarios have been analysed and different hypothetical structural interventions have been examined. The final decision envisaged is to cut the contraction joints in order to reduce the compression stresses in the blocks and in the right gravity shoulder.
机译：在大坝材料的不同演变过程中，最近在意大利，碱集料反应（AAR）现象变得越来越重要。 Poglia大坝代表了一个特别有意义的案例。这种结构的所有者是爱迪生公司（Edison S.p.A.），是空心重力Marcello型大坝（位于伦巴第大区），其目标是水力发电。从七十年代开始，一些测量结果显示海拔升高缓慢，其次是在下游-上游方向，因此，船东已经开始进行一些调查，以便对原因进行清晰的解释。在仔细检查了测量的可靠性（水平度，准直度，摆度，引伸计等）并排除了与基础和桥台稳定性有关的问题之后，探索了可能存在的膨胀现象。为了这个目的，已经进行了深入的原位和实验室活动，并且已经检测到AAR现象的存在。该现象具有适度的实体，但是由于坝体纵向轴线呈非直线形状以及坝体的特殊几何形状，因此在坝体中出现了应力应变状态，这一现象尤其值得关注。坝轴方向的变化。得益于可根据大坝上记录的测量值进行校准的特别先进的有限元计算机程序（CANT-SD：三维非线性，能够模拟AAR膨胀现象），已对不同的演化情景进行了分析并且研究了不同的假设性结构干预。设想的最终决定是切割伸缩缝，以减少砖块和右重力台肩中的压缩应力。

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