基于CT扫描的滨海土壤孔隙空间网络表征与渗流模拟  

Coastal Soil Pore Space Network Characterization and Seepage Simulation Based on CT Scanning

作　　者：佘冬立[1] 韩笑[1] 孙枭沁 唐胜强 王洪德[1] SHE Dongli;HAN Xiao;SUN Xiaoqin;TANG Shengqiang;WANG Hongde(College of Agricultural Science and Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学农业科学与工程学院,南京210098

出　　处：《农业机械学报》2023年第5期308-315,323,共9页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金项目(42177393);江苏省自然资源科技项目(2022046);南通市自然资源和规划科技创新项目(2022005)。

摘　　要：以江苏省沿海地区不同围垦区剖面土层原状土样为研究对象,基于CT扫描技术,通过构建孔隙网络模型,对土壤孔隙分布及其拓扑关系进行定量表征,统计分析了土壤孔喉参数,包括孔径分布、配位数、喉道半径及喉道长度;运用提取的孔隙网络实现土壤中单相水的渗流模拟,分析土壤的绝对渗透系数(饱和导水率)及其主要影响因素。结果表明,围垦活动对改良土壤孔隙活动起到积极作用,随围垦年限的增加,连通孔隙的半径范围、平均配位数、喉道半径趋于增大,喉道长度趋于减小;浅层土壤的孔隙结构较为良好。单相水模拟中,模拟计算的土壤绝对渗透系数和试验测定的饱和导水率结果吻合度较好,呈现出一致的变化规律。灰色关联度显示喉道半径对土壤渗透性能的影响最大。The undisturbed soil samples from the profiles of different reclamation areas in Rudong County,Dongtai City and Binhai County of Jiangsu Province were taken as the research objects.Based on CT scanning technology,through the construction of pore network model,the soil pore distribution and its topological relationship were quantitatively characterized,and the soil pore throat parameters,including pore size distribution,coordination number,throat radius and throat length,were statistically analyzed.Using the extracted pore network,the seepage simulation of single-phase water in soil was realized,the absolute permeability coefficient(saturated hydraulic conductivity)of soil and its main influencing factors were analyzed.The results showed that the reclamation activities played a positive role in improving soil pore activities.The specific performance was that with the increase of reclamation years,the radius range,average coordination number and throat radius of connected pores tended to increase,while the throat length tended to decrease.The pore structure of shallow soil layer was better.In single-phase water simulation,the simulated permeability coefficient was in good agreement with the measured saturated hydraulic conductivity,showing a consistent change trend.The grey correlation degree showed that the throat radius had the greatest influence on soil permeability.

关 键 词：滨海土壤 CT扫描技术 孔隙结构 孔隙网络模型 渗流模拟 

分 类 号：S152.4[农业科学—土壤学]