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  

RESEARCH ON SOFT FOUNDATION SEISMIC SETTLEMENT OF EXPRESS WAY BASED ON EQUIVALENT NODAL FORCE METHOD WITH EQUIVALENT LINEAR MODEL

作　　者：郭中华[1] 王炜[1] 余湘娟[2] 凌镭[1] 

机构地区：[1]东南大学交通学院,南京210018 [2]河海大学岩土工程研究所,南京210098

出　　处：《工业建筑》2004年第1期50-53,78,共5页Industrial Construction

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.

关 键 词：等效线性模型 有效应力 等价结点力法 高速公路 软基 震陷 

分 类 号：U416.1[交通运输工程—道路与铁道工程]