| 摘要: |
| 粗粒土的渗透系数大小与土体类型、物质成分、颗粒级配、颗粒形状、密实度等因素相关.通过室内试验研究了土体颗粒形状、颗粒级配和试样密实度对粗粒土渗透系数的影响.采用正交法设计了9组常水头渗透试验，通过对试验结果进行极差及方差分析，确定了渗透系数随3种影响因素的变化情况.试验结果表明，渗透系数随颗粒级配特征值d20和曲率系数的增大而增大，随干密度的增大而减小，随颗粒球形度的增大而减小. |
| 关键词: 粗粒土 渗透系数 颗粒级配 干密度 颗粒形状 |
| DOI： |
| 分类号:TU411.4 |
| 基金项目:“十二五”国家科技支撑计划资助课题（2012BAB05B04）；重庆市基础与前沿研究计划项目（cstc2013jcyjA30009；cstc2013jcyjA30006） |
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| Experimental studies on influence factors of permeability coefficients of coarse-grained soil |
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WANG Jun-jie, LU Xiao-zhi, QIU Zhen-feng, LIANG Yue
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National Engineering Research Center for Inland Waterway Regulation， Key Laboratory of Hydraulic and Waterway Engineering of Ministry of Education
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| Abstract: |
| The permeability coefficients of coarse-grained soil are closely related to soil types， material composition， grain composition， particle shapes and density. Based on laboratory tests， the effects of particle shapes， grain composition and density on the permeability coefficients of the coarse-grained soil have been studied. In order to analize these influencing factors， nine groups of constant head experiments are designed by use of orthogonal test approaches. The influences of three factors on the permeability coefficients of the coarse-grained soil are determined by range analysis and variance analysis. Research results show that the permeability coefficients are increased with increasing of grain composition characteristic value d20 and increasing of curvature coefficient Cc, and decreased with increasing of dry density and increasing of sphericity. |
| Key words: coarse grained soil permeability coefficients grain composition dry density particle shape |
