基于液化SPT基准值的液化势估计  

Assessment of liquefaction potential based on liquefied reference value of SPT

作　　者：符圣聪[1] 江静贝[1] 

机构地区：[1]中国建筑科学研究院,北京100013

出　　处：《世界地震工程》2010年第4期156-162,共7页World Earthquake Engineering

摘　　要：基于神经网络BP模型和可靠度理论,并沿用抗震规范中液化标准贯入锤击数基准值概念,建立了简化的液化判别概率方法。文中以液化标准贯入锤击数作为估计液化势的基本依据。该基准值是给定地面加速度、土层埋深、地下水位的液化临界锤数,也与震级大小和液化概率有关。为了对不同震级和土层中任一点进行液化判别,引入土层埋深水位以及震级大小对基准值的修正系数。为了方便工程应用,也给出了按地震分组的液化判别方法。Based on ANN model and reliability theory,and in terms of the reference value of SPT in China code a simplified condition probabilistic procedure for liquefaction evaluation is proposed.The assessment of soil liquefaction potential is based on the liquefied reference value of SPT,which is the liquefaction critical value of SPT for given ground acceleration,the depth of soil layers and ground water levels,and is also related to earthquake magnitude and liquefaction probability.The two correction factors of the liquefied reference value for earthquake magnitudes,and the depth of soil layers and ground water levels are respectively given for estimating liquefaction potential at any of soil layers and various earthquake magnitudes.The methods of liquefaction criterion in the light of design earthquake groups are also formulated for facilicating engineering applications in chain.

关 键 词：液化 概率 液化标准贯入基准值 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]