吹填土在冲击荷载下的渗透性试验研究

Test study on permeability of hydraulic fill under impact loading

摘要:

通过制配不同细粒含量的吹填土样，在自行改装设计的渗透仪内进行了冲击荷载作用下的渗透性试验，试验中考虑了细粒含量、冲击能量、冲击遍数和夯后时间等四个因素对夯后土样渗透系数的影响。试验结果表明，细粒含量对冲击荷载下吹填土渗透系数的影响存在一个“分界点”，范围大致在20%~30%之间。通过对试验数据进行统计和拟合，建立了不同细粒含量吹填土在冲击荷载作用后渗透系数随时间变化的预测公式。

Abstract:

The authors modified a falling head permeameter in order to explore the hydraulic conductivity of hydraulic fill under impact loading. A number of laboratory tests were conducted to investigate the effect of impact loading on permeability coefficient of hydraulic fill with different fine content, impact energy, impact passes and the interval time after hitting. It was found that the effect of fine content on permeability of hydraulic fill after impacting exists a “critical value” which was between 20% and 30%. Based on the test results, an approximate formula was developed to predict the coefficient of permeability of hydraulic fill with different fine content after hitting.