简化的液化判别概率法  

A Simplified Probabilistic Method for Liquefaction Evaluation

作　　者：符圣聪[1] 江静贝[1] 

机构地区：[1]中国建筑科学研究院工程抗震研究所,北京100013

出　　处：《工程抗震与加固改造》2008年第3期93-98,共6页Earthquake Resistant Engineering and Retrofitting

摘　　要：在本文中,液化极限状态函数和液化概率函数分别来自ANN模型分析和可靠度计算。根据这两个函数和Seed的地震应力公式,作者提出简化的液化判别概率公式N=αβN0。N是临界液化锤击数;N0是给定震级、加速度、概率水平、土层埋深和水位的标准贯入锤击数基准值;α为土层埋深水位修正系数,是埋深的非线性函数;β为基准值震级修正系数。该式简单实用,可用于液化风险决策。In this paper, the liquefaction limit state function of saturated sandy soils during an earthquake and the probability function are respectively obtained from the ANN model analysis and the reliability analysis. Based on the two functions and Seed cyclic stress ratio formula, a simplified probabilistic formula for liquefaction evaluation, N = αβN0, is presented in this paper. The N is critical liquefaction SP＇I＂ value ; the N0 is the reference value of SPT for given earthquake magnitude, peak horizontal acceleration, probability level, depth of soil layers and water level; The α is the coefficient of the depth and water level of soil layers; β is the adjusted coefficient to earthquake magnitude. This formula is very simple and practical,and it can be used for risk-based decision.

关 键 词：极限状态函数 液化概率函数 标准贯人锤击数基准值 土层埋深水位系数 基准值的震级系数 

分 类 号：TU435[建筑科学—岩土工程]