粗粒土振动压实特性试验

以8种不同级配的粗粒土为研究对象,采用室内表面振动压实试验方法,研究粗粒土的级配特性与压实设备的振动频率、激振力对粗粒土压实特性的影响,并利用多元线性回归方法,分析土样级配特性对粗粒土压实效果的影响,最后建立粗粒土最大干密度与其级配特征粒径之间的关系式,并提出用5个特征粒径表示的级配特征函数。结果表明:级配不同的粗粒土在不同激振力、振动频率作用下,干密度-振动频率、干密度-激振力曲线形状几乎呈正态分布,存在最大干密度和对应的最佳振动频率、最佳激振力。

Test on Vibrated Compaction Properties of Coarse-grained Soil

Directed against 8 kinds of coarse-grained soil with different gradations,through surface vibrated compaction test method in the lab,authors researched the effect of the gradation property of the coarse-grained soil,the vibration frequency and the excitation force of the compaction equipment on the compaction properties of coarse-grained soil.Using multi-linear regression method,the influence of gradation property of soil sample on compaction effect of coarse-grained soil was analyzed.In the end,the relational formula between the maximum dry density and its gradation characteristic granular diameter of coarse-grained soil was established,and the gradation characteristic function was put forward,which made the maximum dry density of the coarse-grained soil relate with its gradation properties directly.The results show that the relations between the dry density and the vibration frequency,the dry density and the excitation force of the coarse-grained soil are almost accord with normal distribution,which means that there are optimum vibration frequency and optimum excitation force for different coarse-grained soils.