引黄泥沙对黏质盐土饱和导水率的影响  

Effects of Sand⁃Mixingon Saturated Water Permeability of Clay Saline Soil

作　　者：曲英杰 毛伟兵[1] 孙玉霞[1] 孙池涛 孙雪蓉 QU Yingjie;MAO Weibing;SUN Yuxia;SUN Chitao;SUN Xuerong(College of Hydraulic and Civil Engineering,Shandong Agricultural University,Tai’an 271000,China)

机构地区：[1]山东农业大学水利土木工程学院,山东泰安271000

出　　处：《人民黄河》2021年第5期158-162,共5页Yellow River

基　　金：山东省重点研发计划项目(2019GSF109014)。

摘　　要：为研究引黄泥沙对黏质盐土颗粒组成和土壤饱和导水率(Ks)的影响,以滨海地区黏质盐土为研究对象,利用黄河三角洲引黄灌区亟须处理的淤积泥沙作为改良剂,分别进行了土壤颗粒组成和土壤饱和导水率测定试验。结果表明:①黏质盐土随配沙比例增大,极细砂含量由3.3561%增长到61.4611%,细砂含量由0.1809%增长到2.4597%,粗粉粒含量由47.4374%降低至31.1509%,细黏粒含量由29.0153%降至3.8939%;②土壤饱和导水率随配沙比的增大而增大,二者为极其显著的指数函数关系,决定系数为0.9375,以理想饱和导水率为限制条件,适宜配沙比例为[45.7%,56.8%];③土壤粒级与土壤饱和导水率的作用强度大小排序为极细砂>细砂>粗粉粒>中砂>细粉粒>细黏粒>粗砂>粗黏粒>石砾;④建立了极细砂含量和细砂含量x与土壤饱和导水率的回归方程,分别为Ks=0.0186e0.083x,Ks=0.01607e2.122x。In order to study the effect of the Yellow River sediment on clay saline soil particle composition and saturated water conductivity of soil,the coastal clay saline soil was taken as the object of study and using the sediment which needs to be treated urgently in the irrigation ar⁃ea of the Yellow River delta as the improver to determine the soil particle composition and saturated water conductivity of soil respectively.The results show that a)as the increase of the proportion of clay saline soil,the content of very fine sand is increased from 3.3561%to 61.4611%,the content of fine sand is increased from 0.1809%to 2.4597%,the content of coarse powder is decreased from 47.4374%to 31.1509%and the content of fine clay is decreased from 29.0153%to 3.8939%.b)The saturated water conductivity of soil is increased with the increase of sand distribution,showing a very significant positive exponential function correlation.The R2 value reaches 0.9375.Tak⁃ing the ideal saturated water distribution as the limiting condition,the appropriate sediment ratio is 45.7%and 56.8%.c)The order of the interaction strength between soil particle size and soil saturated hydraulic conductivity is as follows:very fine sand>fine sand>coarse pow⁃der>medium sand>fine powder>fine clay>coarse sand>coarse clay>gravel.d)The regression equations of extremely fine sand con⁃tent and fine sand content and saturated water conductivity of soil are established respectively.

关 键 词：黏质盐土 引黄泥沙 土壤饱和导水率 土壤颗粒组成 

分 类 号：S156.4[农业科学—土壤学] TV882.1[农业科学—农业基础科学]