微震对饱和细粒土体渗透系数影响试验研究

Experimental Studies on the Effect of the Low Amplitude Vibrations on the Permeability of Saturated Fine Grained Soils

饱和细粒土体在微震作用下易于产生振动液化现象,严重影响建造在该土体上公路使用功能的正常发挥。为控制施工过程中饱和细粒土的微震液化发生,基于室内外试验研究微震对土体渗透系数的影响,研究表明渗透系数随着振动次数的增加呈现先减小后增大的趋势,土的粒径大小与级配和孔隙比对渗透系数的影响最大。研究结果可为饱和细粒土地区施工中控制微震液化提供一定的指导作用。

The saturated fine grained soils are prone to liquefy under low amplitude vibrations. The normal operations of high- ways constructed over these soils might be seriously affected. In order to minimize the adverse liquefaction effect of fine grained soils during the construction, the impact of low amplitude vibration on the soil permeability is studied using laboratory and field tests. It is concluded that, as the number of vibrations increases, the measured coefficient of permeability tends to first decrease and then decrease for different types of soils. The grain size, gradation and the void ratio of the soils have the significant effect on the soil permeability.