高重力坝底孔坝段有限元静动力分析研究
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摘要
某200m级的碾压混凝土重力坝坝基地质条件复杂,两条断层分别位于坝踵、坝趾附近岩体的关键部位,对坝基、坝体的变形、应力、抗滑稳定性等有较大的影响,因此有必要采用有限元法复核该坝在静动力作用下的应力变形。建立了该坝底孔坝段的三维有限元模型,分别以规范反应谱、场地反应谱为目标谱合成了设计地震、校核地震下共四条人工地震波,然后对该底孔坝段模型在九种工况下进行了静、动力分析,并对坝体关键部位的主应力按极限状态公式进行了强度验算。结果表明:在静力、设计地震、校核地震作用下,底孔坝段坝踵垫层混凝土和上、下游折坡处材料抗拉强度均满足要求;坝趾的抗压强度也满足要求,并且具有较大的安全裕度;场地谱人工波的计算结果与规范谱人工波的结果很接近。
The geological conditions of the foundation of a 200 m high RCC gravity dam are very complicated.Two faults are locating the critical sites near the dam heel and dam toe,which takes significant influence to the deformation,stress and anti-slide stability of the dam.So it is necessary to check the dam's deformation and stress under the static and dynamic loads by using finite element method.The 3 -D finite element model of the bottom outlet section of the dam is built.Then four simulated earthquake waves are synthesized under the design earthquake and check earthquake conditions based on the specification spectrum and the site spectrum.The static and dynamic analysis of the bottom outlet dam section under nine calculation conditions are carried out.The principal stresses of the dam's main parts are checked by the limit state equation.It is concluded that the concrete's tensile strength of the dam heel under the static and dynamic action meets the standard requirements.The compressive strength of the dam toe also meets the standard requirements with a large margin of safety.The results under the different earthquake waves of the site spectrum and the specification spectrum are very similar.
The geological conditions of the foundation of a 200 m high RCC gravity dam are very complicated.Two faults are locating the critical sites near the dam heel and dam toe,which takes significant influence to the deformation,stress and anti-slide stability of the dam.So it is necessary to check the dam's deformation and stress under the static and dynamic loads by using finite element method.The 3 -D finite element model of the bottom outlet section of the dam is built.Then four simulated earthquake waves are synthesized under the design earthquake and check earthquake conditions based on the specification spectrum and the site spectrum.The static and dynamic analysis of the bottom outlet dam section under nine calculation conditions are carried out.The principal stresses of the dam's main parts are checked by the limit state equation.It is concluded that the concrete's tensile strength of the dam heel under the static and dynamic action meets the standard requirements.The compressive strength of the dam toe also meets the standard requirements with a large margin of safety.The results under the different earthquake waves of the site spectrum and the specification spectrum are very similar.
引文
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