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为判断混凝土面板堆石坝地震后体积剪胀或剪缩问题,基于紫坪铺混凝土面板堆石坝汶川地震前后坝体若干测点的实测数据,根据4个节点构成的单元面积进行变形统计分析,对坝体单元的剪胀剪缩特性进行了探讨。分析了断面D0+251和D0+371的水平位移、竖直位移及各单元的面积变化,得到混凝土面板堆石坝地震变形规律为坝体断面缩小、坝体边坡向内部收缩,尤以最大断面附近收缩较为明显,且随坝体高程降低收缩量减小;坝体不同部位单元面积的变化与其所处位置和周围的应力状态相关,坝体整体上各个单元面积减小,而处于坝顶附近和边缘的个别单元由于顶部面板脱空和单元面积剪胀引起面积增大,从而为今后的施工设计和计算校核提供了依据。
In order to determine the dilatancy or shear volume of concrete faced rockfill dam after earthquake, based on the measured data of some measuring points before and after Wenchuan earthquake of Zipingpu concrete faced rockfill dam, the deformation statistical analysis is made based on the unit area of 4 nodes , Dilatancy shear-shrinkage characteristics of dam unit are discussed. The horizontal displacement and vertical displacement of D0 + 251 and D0 + 371 are analyzed. The seismic deformation law of concrete faced rockfill dam is that the dam section shrinks and the slope of the dam shrinks inward, especially the largest The shrinkage near the cross section is more obvious, and the shrinkage decreases with the elevation of the dam. The change of the unit area in different parts of the dam is related to the stress state at the location and the surrounding area of the dam. The overall unit area of the dam decreases, The number of individual units in the vicinity and at the edge increased due to the emptying of the top panel and dilatancy of the cell area, which provided the basis for future construction design and calculation check.