基于等效线性模型等价结点力法的高速公路软基震陷反应研究
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摘要
一般认为 ,震陷发生的机理 ,震陷与地震作用强度、持续时间、土体性状、构筑物强度、位置及抗震措施等有关。从工程应用来看 ,为了预防或降低震陷的危害 ,除了加强抗震设施外 ,通过数值计算来估算震陷量 ,具有一定的社会效益与经济效益。通过有效应力等效线性动力反应分析 ,运用等价结点力法分析了某高速公路软粘土路基震陷随地震最大加速度的变化趋势 ,建立了震陷同路堤高度、软土动模量系数、饱和重度、遭遇的竖向与水平向地震加速度放大系数之比和水平向地震系数等因素的相关关系式。此外还认识了频谱对震陷的影响 ,对相关研究具有一定的启发性。
It was said that the seismic settlement relates to the earthquake intensity,the endurance period,the soil behavior,the structure intensity,the location and the aseismatic means etc.For the technical application,in order to prevent or reduce the damage of the seismic settlement,besides reinforcing aseismatic facilities,it brings definite social advantage and economic benefit to estimate the magnitude of the seismic settlement via numerical calculation in engineering construction.By the effective stress dynamic response analysis with equivalent linearity,this text utilizes the equivalent nodal force method to analyze the variation tendency of the soft clay seismic settlement of a certain highway foundation along with the seismic peak acceleration,and establishes a formula of the seismic settlement which is related with the embankment height,the soft soil dynamic modular coefficient,the saturated unit weight,the ratio of the amplification factor of the vertical seismic acceleration to the horizontal one and the horizontal seismic coefficient etc.Furthermore,the effect of the frequency spectum on the seismic settlement is still be realized taking on some instructiveness for the correlative research.
It was said that the seismic settlement relates to the earthquake intensity,the endurance period,the soil behavior,the structure intensity,the location and the aseismatic means etc.For the technical application,in order to prevent or reduce the damage of the seismic settlement,besides reinforcing aseismatic facilities,it brings definite social advantage and economic benefit to estimate the magnitude of the seismic settlement via numerical calculation in engineering construction.By the effective stress dynamic response analysis with equivalent linearity,this text utilizes the equivalent nodal force method to analyze the variation tendency of the soft clay seismic settlement of a certain highway foundation along with the seismic peak acceleration,and establishes a formula of the seismic settlement which is related with the embankment height,the soft soil dynamic modular coefficient,the saturated unit weight,the ratio of the amplification factor of the vertical seismic acceleration to the horizontal one and the horizontal seismic coefficient etc.Furthermore,the effect of the frequency spectum on the seismic settlement is still be realized taking on some instructiveness for the correlative research.
引文
1 SeedHB .土的问题和性能.见:罗伯特L .威格尔.中国科学院工程力学研究所,译.地震工程学.北京:科学出版社,1978.258～281
2 张克绪,李明宰,王治琨.基于非曼辛准则的土动弹塑性模型.地震工程与工程振动,1997,17(2):74～80
3 TaniguchiE ,etal.PredictionofEarthquakeInducedDeformationofEarthDams.SoilsandFoundation,1983,23(4)
2 张克绪,李明宰,王治琨.基于非曼辛准则的土动弹塑性模型.地震工程与工程振动,1997,17(2):74～80
3 TaniguchiE ,etal.PredictionofEarthquakeInducedDeformationofEarthDams.SoilsandFoundation,1983,23(4)
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