某重力坝岸坡坝段上游面裂缝对工作性态影响分析

Analysis of impact of upstream face cracks on working performance in slope dam section of a gravity dam

某重力坝岸坡两个坝段上游坝踵附近存在裂缝,考虑极端恶劣情况,即不考虑上游面裂缝前混凝土,采用有限元和材料力学两种方法对大坝工作性态进行分析,给出结构变形、应力和抗滑稳定安全情况。结果显示,存在裂缝时,坝体刚度减小,顺河向和横河向变形值增大,坝踵和坝趾压应力值较设计情况略有增加,未出现应力恶化现象;坝段抗滑安全系数略有减小,仍满足安全要求。整体来看,现有裂缝对结构工作性态不会产生明显影响,坝体可以安全运行。

Cracks near dam heel exist in two dam sections of a gravity dam. In order to analyze the impact on working performance of the dam, the extreme case is considered that the concrete before the cracks are removed. Deformation, stress and stability against sliding are given with FEM and Mechanics of materials. The results show that the global stiffness decreases and deformation increases slightly with cracks in the dam. The compressive stress value of dam heel and dam toe increase, therefore the stress status is better than the integrated dam. The stability coefficients against sliding decrease slightly. Overall, the existing cracks will not have a significant impact on the structure working performance and the dam will work safely.