长江口航道淤泥屈服应力测量及特性研究  

Study on yield stress measurement and characteristics of mud in the Yangtze River Estuary

作　　者：崔莉 蒋勤[1] 聂思航 CUI Li;JIANG Qin;NIE Si-hang(College of Harbor,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学港口海岸与近海工程学院,江苏南京210098

出　　处：《泥沙研究》2020年第2期31-37,共7页Journal of Sediment Research

基　　金：国家重点研发计划项目(2018YFC0407501);国家自然科学基金项目(51479056)。

摘　　要：针对长江口航道淤泥,采用剪切应力扫描、流动启始测量、剪切速率扫描和间接测量等四种典型的流变特性测量方法,对容重为1.20~1.72 g/cm^3的淤泥的流变特性进行了实验研究。对比分析了由四种测量方法得到的屈服应力值的变化范围和各种测量方法的特点及其可靠性。揭示了容重对长江口航道淤泥的屈服特性的影响。结果表明:长江口航道淤泥具有明显的双宾汉体特性,可以采用Dual-Herschel-Bulkley模型定量描述。四种测量方法得到的屈服应力值有不同差异,流动启始测量法得到的屈服应力值明显偏大,其他三种测量方法得到的结果相差较小。此外,淤泥的屈服应力值受容重的影响显著,随着容重的增加而增大,且随容重呈指数变化趋势增长。Experiment study on rheological property and yield stress of mud in the Yangtze River estuary were conducted by four typical rheological measurement methods,including shear stress ramp method,start-up test method,shear rate ramp method and indirect method.The bulk density of mud samples in the experiment varies from 1.20~1.72 g/cm^3.The characteristics and reliability of the four different methods were analyzed by comparing the characteristics and variation ranges of yield stresses obtained by these methods.The influences of the bulk density on yield stress were also studied.Results show that the rheological response of mud can be described quantitatively by using the Dual-herschel-bulkley model.The values of yield stresses obtained by the four methods are different.Yield stress values obtained by the start-up test method are obviously larger,while the results obtained by the other three test methods are less different and similar.The yield stress is significantly affected by the bulk density,which increases exponentially with the increase of bulk density.

关 键 词：长江口航道淤泥 流变特性 屈服应力 流变特性测量方法 

分 类 号：TV148.1[水利工程—水力学及河流动力学]