基于土壤质地分类的土壤渗透性影响因素研究  

Influence factors of soil permeability based on soil texture classification

作　　者：周韩 罗璟[1] 杨沛璋 杨鹏 ZHOU Han;LUO Jing;YANG Peizhang;YANG Peng(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059

出　　处：《人民长江》2023年第8期153-159,共7页Yangtze River

基　　金：国家自然科学基金项目(42107212,41521002);四川省自然科学基金项目(2022NSFSC1145)。

摘　　要：土壤渗透性是影响降雨入渗-径流过程的关键指标,对准确开展水利水电工程规划设计中的行洪论证至关重要。国道G318川藏段地质条件复杂,土壤类型多样,生态环境敏感脆弱,土壤渗透性差异显著。为研究影响土壤渗透性能的主控因素,对沿线取得的土壤样品进行变水头渗透试验,在颗粒分析的基础上,将土壤样品分为粉壤土、砂壤土、壤砂土,研究干密度、不均匀系数、曲率系数、植物根系对土壤渗透性的影响规律。研究结果表明:当土壤处于相同物性条件下时,土壤渗透系数随砂粒含量增加而增大,即渗透系数:壤砂土>砂壤土>粉壤土;在不含植物根系情况下,土壤渗透系数均与干密度呈负相关,与不均匀系数和曲率系数呈正相关,其中,砂壤土敏感性最高;而含植物根系土壤渗透系数普遍高于不含植物根系的同类土壤;对于含植物根系土壤而言,植物根系对粉壤土渗透系数的影响最大,并且随土壤颗粒粒径增大,植物根系对土壤渗透系数影响逐渐降低。Soil permeability is a key factor affecting the rainfall infiltration-runoff process,which is very important to accurately carrying out the flood discharge demonstration in the planning and design of hydropower and water conservancy projects.The geological conditions along the"G318"Sichuan-Tibet section are complex,the soil types are diverse,the ecological environment is sensitive and fragile,and the soil permeability is significantly different.To study the main influence factors affecting soil permeability,the variable-head permeability test was carried out on soil samples along the route.Based on particle size,the soil samples were divided into silty loam,sandy loam,and loamy sandy soil according to the classification standard of sand component content in the soil texture classification.The effects of dry density,non-uniformity coefficient,curvature coefficient,and plant roots on soil permeability were studied.The results show that when the soil is in the same physical properties,the soil permeability coefficient increases with the increase of sand content,the permeability coefficient is in an order of loamy sand>sandy loam>silty loam.In the condition of no plant roots,the soil permeability coefficient is negatively correlated with dry density,and positively correlated with non-uniformity coefficient and curvature coefficient,among which the sensitivity of sandy loam is the highest.The permeability coefficient of soil with plant roots is generally higher than that of the same soil without plant roots.The influence of plant roots on the permeability coefficient of silty loam soil is the largest,and the influence of plant roots on the permeability coefficient of soil gradually decreases with the increase of soil particle size.

关 键 词：渗透系数 变水头试验 回归分析 植物根系 土壤质地分类 

分 类 号：TU411.4[建筑科学—岩土工程]