考虑颗粒形状的粗粒土渗透特性试验研究-南水北调与水利科技.PDF

第 12 卷 第4 期 南 水 北 调 与 水 利 科 技 Vol.12 No.4 2014 年 8 月 South2to2 North Water Transfers and Water Science Technology Aug . 2014 DOI: 10. 1 476/ j . cnki. nsbdqk. 2014. 04. 022 1, 2 1, 2 1, 2 邱珍锋 , 卢孝志 , 伍应华 ( 1. 重庆交通大学 国家内河航道整治工程技术研究中心, 重庆 400074; 2. 重庆交通大学 水利水运工程教育部重点实验室, 重庆 400074) : 粗粒土的渗透特性与物质成分、颗粒级配、颗粒形状、密实度等因素相关。通过室内垂直渗透试验, 探讨了土 体颗粒形状、颗粒级配和试样密实度 粗粒土渗透系数的影响。九组正交试验结果的极差及方差分析表明, 级配 渗透性的影响最大; 两组颗粒形状 比分析试验结果表明, 试样渗透系数随着颗粒球形度增大而增大。通过 试验 结果反映的渗透特性进行分析, 总结了以渗透系数作为变量的临界水力梯度估算公式。 : 粗粒土; 渗透系数; 颗粒级配; 干密度; 颗粒形状 : TU4 11.4 :A :( 2014) 0420102205 Experimental Research on the Permeability Property of Coarse Grained Soils Considering the Particle Shape QIU Zhen2feng1, 2 , LU Xiao2zhi1, 2, WU Ying2hua1, 2 ( 1. N ational Engineering Research Center f or I nland Waterway Regulation, Chongqing Jiaotong University , Chongqing 400074, China; 2. Key Laboratory of H y draulic and Waterway Engineering of Ministry of Education, Chongqing Jiaotong University, Chongqing 400074, China) Abstract: The permeability propert y of coarse grained soils is closely related t o material composition, grain size distribution, par2 ticle shape, and particle density. Based on the laboratory permeability test, the effects of particle shape, grain size distribution, and particle density on the permeability property of coarse grained soils w ere studied. Nine orthogonal experiments and tw o par2 ticle shape experiments w ere performed. The results show ed that grain size distribut ion has the largest impact on permeability based on the range analysis and variance analysis of the ort hogonal t ests, a