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为有效地评价混凝土重力坝的抗震性能,考虑迎水面破坏、不同裂缝倾入坝体的程度、灌浆帷幕破坏程度和损伤区域的位置对重力坝整体结构的影响,基于混凝土塑性损伤力学本构模型定义大坝整体损伤指标,并以整体损伤指标划分重力坝地震破坏等级,建立混凝土重力坝抗震破坏评价模型。采用该方法对某混凝土重力坝的抗震安全进行评价,得到强震作用下大坝的破坏模式及抗震性能,结果表明该大坝在设计地震下发生的破坏为可修复性破坏,在校核地震下会发生严重破坏,坝头可能会发生断裂,建议强震发生时及时降低库水位以确保下游安全。
In order to effectively evaluate the seismic performance of concrete gravity dam, considering the influence of water level failure, the degree of different fractures dumped into the dam, the degree of grouting curtain damage and the location of damage area on the overall structure of gravity dam, based on the plastic damage mechanics constitutive model Define the overall damage index of the dam, divide the damage grade of the gravity dam by the overall damage index, and establish the evaluation model of the seismic damage of the concrete gravity dam. The method is applied to evaluate the seismic safety of a concrete gravity dam, and the failure mode and seismic performance of the dam under strong earthquake are obtained. The results show that the damage of the dam under design earthquake is repairable, Will be under serious damage, the dam head may fracture, it is proposed to promptly reduce the reservoir water level in the event of a strong earthquake to ensure downstream safety.