基于信息扩散模型的砂土地震液化评价研究

RESEARCH ON SAND SEISMIC LIQUEFACTION BASED ON INFORMATION DIFFUSION MODEL

饱和砂土地震液化可对建筑物、道路与水力设施等造成严重破坏。因此,合理判别与评价饱和砂土的地震液化等级显得尤为重要。针对实际工程中钻孔样本数据有限、液化等级难以区分等问题,首先选取地震震级、地面加速度、标贯基数、土层黏粒含量和有效应力构建砂土地震液化判别评价系统;其次运用信息扩散模型将判别指标离散成多个点,并将相应信息扩散到各离散点,从而建立砂土地震液化等级判别的模糊信息扩散矩阵;最后结合工程实例进行了合理评价,可为砂土液化防治工程提供借鉴。

Seismic liquefaction of saturated sandy soil can cause serious damage to buildings,roads and hydraulic facilities.Therefore,the reasonable discrimination and evaluation of seismic liquefaction of saturated sandy soil is particularly important.Aiming at the problems of limited drilling sample data and difficulty in distinguishing liquefaction levels in practical engineering.Firstly,the seismic magnitude,ground acceleration,standard penetration number,soil clay content,and effective stress are selected to construct a sand liquefaction discrimination and evaluation system.Secondly,the information diffusion model is used to discretize the discriminant indicators into multiple points,and the corresponding information is spread to each discrete point,furthermore,a fuzzy information diffusion matrix for determining the seismic liquefaction level of sandy soil is structured in this paper.Finally,a reasonable evaluation was conducted based on engineering examples,which can provide reference for sand liquefaction prevention engineering.