摘要
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 evaluate the earthquake resistant behavior of concrete gravity dam effectively, nonlinear seismic analysis of a concrete gravity dam is performed based on the plastic damage constitutive model. Based on the seismic safe ty of structural performance, a seismic damage assessment model considering the influence of the damage of the upper part, the crack length and the damage of curtain grouting on dam safety was developed for describing the damage of the concrete gravity dam. Based on this approach, the seismic safety of a certain concrete gravity dam has been evaluated. In addition, possible failure modes and seismic performance of the dam are obtained under the action of strong earthquake. The results show that the dam damage is repaired at the design operating condition while it will damage severely in the check earthquake and the abutment may be fractured. Therefore, it suggests that the water level of reservoir should be fallen to ensure the lower reaches safety when the strong earthquake appears.
出处
《水电能源科学》
北大核心
2013年第8期84-88,共5页
Water Resources and Power
基金
国家自然科学基金创新研究群体科学基金资助项目(51021004)
关键词
混凝土重力坝
地震安全评价
动力响应
破坏模式
损伤指标
concrete gravity dam
seismic safety evaluation
dynamic response
failure mode
damage index
