不同密实度下砂砾土的渗透系数试验分析  

Experimental Analysis of Permeability Coefficient of Sandy Gravel Soil under Different Density

作　　者：唐红梅[1] 王林峰[1] 闫凝 TANG Hongmei;WANG Linfeng;YAN Ning(Geotechnical Engineering Research Institute of Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学岩土工程研究所,重庆400074

出　　处：《路基工程》2020年第6期19-24,共6页Subgrade Engineering

基　　金：重庆交通大学:粗粒土的渗透综合型实验的教学改革研究(syj201711)。

摘　　要：通过不同单粒径砂、砾和级配砂砾与中砂组成砂砾土,在不同的砂石比和孔隙比下进行常水头渗透试验。结果表明:单粒径砂砾土的渗透系数随孔隙比增大而增大,随砂砾粒径的增大而减小,随砂石比增大而减小,砂石比大于等于5∶5后,砂石比对其渗透系数影响不明显;级配砂石土的渗透系数随孔隙比增大而增大,随砂石比从4∶6到5∶5显著降低,而砂石比6∶4到7∶3其渗透系数变化趋于稳定;单粒径砂砾土的渗透系数明显大于级配砂砾土,级配砂砾土的渗透系数离散性更高,说明其影响因素更复杂。Constant head permeability tests were carried out under different sand and gravel ratios and pore ratios for sand and gravel soils composed of different single grain size sand,gravel and graded sand and gravel and medium sand.The results show that the permeability coefficient of sand and gravel soil with single particle size increases with the increase of pore ratio,decreases with the increase of sand and gravel size,and decreases with the increase of sand and gravel ratio.Moreover,when the sand and gravel ratio is greater than or equal to 5∶5,the influence of the sand and gravel ratio on the permeability coefficient will be insignificant.The permeability coefficient of graded sand and gravel soil increased with the increase of the pore ratio,and decreased significantly with the the sand and gravel ratio from 4∶6 to 5∶5,while the change of the permeability coefficient of sand and gravel ratio from 6∶4 to 7∶3 tended to be stable.The permeability coefficient of single grain size sandy gravel soil was significantly higher than that of graded sandy gravel soil,and the discreteness of graded sandy gravel soil was higher,indicating that the influencing factors were more complex.

关 键 词：砂砾土 渗透系数 单粒径 混合级配 孔隙比 

分 类 号：U411.4[交通运输工程—道路与铁道工程]