细粒含量对粉土液化特性影响的试验研究

采用动三轴仪进行粉土液化试验,研究了不同干密度、有效围压、粉粒含量及粘粒含量变化对饱和粉土液化特性的影响。试验结果表明:干密度增加,粉土动强度增加;不同有效围压对动强度的影响不大,其他条件相同时归一化的动强度比基本不变;粘粒含量和粉粒含量对粉土动强度有较大影响。粉土中粘粒含量变化对动强度的影响规律并不是单调变化的,而是在粘粒含量为8%时粉土动强度达到最小值;粉土中粉粒含量变化对动强度影响是单调线性关系,随着粉土中粉粒含量的增加,粉土动强度也线性增加。粉土中粘粒含量和粉土含量对其动强度的影响规律需从粉土的微观结构角度解释。

Experimental Study of the Influence of Fines Content on Liquefaction Characteristics of Silt

Many silt liquefaction tests were carried out by a dynamic triaxial apparatus to study the influence of dry density,effective cell pressure,silt and clay particle content of silt sample on silt liquefaction.It is concluded that the dynamic strength increase with the increasing of dry density and the effective of cell pressure has little influence on the ratio of dynamic strength.The fines content including clay particle and silt particle have great influence on dynamic strength.The influence of clay particle content does vary monotonically with the increasing of clay content,reaching the minimal value when the clay particle content is 8%.The influence of silt particle content on dynamic strength is a monotonically linear.With the increasing of silt particle content the dynamic strength increases.The cause of the influence of clay particle and silt particle content should be explained from the point of view of the structure of silt itself.