考虑材料非均匀性的Oyuk坝静动破坏模式分析与安全度评价  

Static and Seismic Failure Modes and Structural Safety of Oyuk Dam Considering Material Heterogeneity

作　　者：熊堃[1,2,3] 花俊杰 李锐 

机构地区：[1]中国水利水电科学研究院,北京100048 [2]长江勘测规划设计研究有限责任公司,武汉430010 [3]国家大坝安全工程技术研究中心,武汉430010 [4]长江岩土工程总公司(武汉),武汉430010

出　　处：《长江科学院院报》2014年第7期74-80,90,共8页Journal of Changjiang River Scientific Research Institute

基　　金：中国博士后科学基金(2012M511594);国家大坝安全工程技术研究中心开放基金(NDSKFJJ1103)

摘　　要：Oyuk坝是世界上仅有的两座百米级硬填料坝之一。在宏观均质假定的基础上考虑硬填料较为明显的细观非均匀性的影响,基于损伤本构模型对Oyuk坝在正常运行工况以及地震工况下的大坝工作性态进行了分析,采用水荷载与地震荷载超载法,探讨了Oyuk坝在静动条件下的破坏模式与安全度,并与弹塑性本构模型的计算结果进行了对比。研究结果表明:在正常运行工况以及OBE地震工况中,Oyuk坝基本全断面受压,坝体强度安全系数与抗滑稳定系数均较高,坝体基本处于弹性工作状态;大坝存在静力整体失稳的破坏模式,但对水荷载的超载安全度高,且抗震性能好;采用考虑细观非均匀性的损伤本构模型所得大坝的破坏过程与破坏形态比弹塑性模型的模拟结果更贴近实际。Oyuk dam is one of the only two hardfill dams with the height of more than 100 m in the world. The obvious heterogeneity of hardfill material on microscopic level had been taken into consideration based on the macrohomogeneity assumption. The working behaviors of Oyuk dam under normal operation condition and earthquake condition were analyzed by using damage FEM. The failure modes and structural safety of dam under static and seismic conditions were explored in the presnce of water overload and seismic over load,and the results were compared with that obtained from elastic-plastic constitutive model. The results show that the whole profile of dam body is almost compressed under the conditions of normal operation and operation basis earthquake（ OBE）. The dam owns high strength and anti-sliding safety factors and is basically in an elastic working state. The failure mode of Oyuk dam is mostly integral sliding in static condition,but the dam is proved to possess high overload safety for waterload and strong earthquake-resistance. The dam＇s failure process and failure modes analyzed by the damage constitutive model in consideration of material heterogeneity is more in conformity with the actual situation than that analyzed by elastic-plastic constitutive model.

关 键 词：Oyuk坝 硬填料坝 细观非均匀性 破坏模式 安全度 

分 类 号：TV64[水利工程—水利水电工程] TV31