吹填土液化特性研究

Study of Reclaimed Sand Liquefaction Characteristics

围海造陆逐渐成为滨海土地开发的重要技术手段,历次地震中均出现了明显的吹填土人工场地液化现象,并造成了严重的液化灾害,因而吹填土的液化特性逐渐受到关注。为了研究吹填土的液化特性,在广州南沙某吹填场地获取土样进行粒组分析,并按比例混合。通过GDS动三轴仪进行动三轴试验,研究了含砂量对吹填土液化特性的影响。试验结果表明:吹填土的抗液化强度随着含砂量的增大而降低;当含砂量大于60%时,随着含砂量的增加吹填土的抗液化强度先增大后降低,在某一含砂量时其抗液化强度达到最低。含砂量对Finn孔压模型参数影响较大,给出了不同含砂量下吹填土Finn孔压模型参数,旨在为吹填土场地液化数值分析提供初步依据。

The reclaiming project has been the main technical method of coastal land development,the obvious soil liquefaction phenomena of the reclaimed sand often appear in the artificial field when there is an earthquake,and the serious liquefaction disaster therefore emerges. So the characteristics of reclaimed soil has been gradually attached the attention to. For the research on liquefaction characteristics of it,the soil sample was collected from one Guangzhou nansha reclamation ground and the particle group analysis was made,the soil sample was mixed in certain proportion. The GDS triaxial apparatus was used to do a dynamic triaxial experiment and effect of sand content on liquefaction characteristics of reclaimed soil was studied. The results showed that the cyclic resistance ratio decreased as the sand content increased; when the sand percentage was more than 60%,the cyclic resistance ratio increased before it reduced,reached lowest level with a sand content then increased again. Sand content exerted a great influence on Finn model pore pressure model parameters,reclaimed soil ＇s Finn model pore pressure model parameters under different sand content were given,which provided a preliminary basis for the numerical analysis for reclaimed soil.