不同含水率对海相黏土流变特性和流变参数的影响  

Effect of Different Moisture Content on Rheological Properties and Rheological Parameters of Marine Clay

作　　者：李伟[1] 刘叔灼[1,2] 单毅 孙尉翔[5] LI Wei;LIU Shu-zhuo;SHAN Yi;SUN Wei-xiang(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,China;State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510641,China;School of Civil Engineering,Guangzhou University,Guangzhou 510006,China;Department of Geosciences,University of Padova,Padova 351225,Italy;School of Materials Science and Engineering,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510641 [2]华南理工大学亚热带建筑科学国家重点实验室,广东广州510641 [3]广州大学土木工程学院,广东广州511442 [4]帕多瓦大学地球科学系,帕多瓦35122 [5]华南理工大学材料科学与工程学院,广东广州510641

出　　处：《广东海洋大学学报》2022年第2期120-125,共6页Journal of Guangdong Ocean University

基　　金：国家自然科学基金项目(52008121,52011530394);广东省自然科学基金面上项目(2020A1515010713);中国博士后科学基金面上项目(2020M682652);广东省青年优秀科研人才国际培养计划。

摘　　要：【目的】研究不同含水率对海相黏土流变特性的影响规律,分析其流变特性的作用机理。【方法】借助大振荡剪切试验,从储能/损耗模量、非线性黏弹性、屈服应力、塑性黏度等不同角度,研究含水率对海相黏土流变特性的影响。【结果】储能模量数值、损耗模量峰值与含水率敏感性保持一致。利用数值拟合获得海相黏土的塑性黏度、屈服应力随含水率的变化规律。【结论】海相黏土的非线性黏弹性可通过Lissajous曲线来表征,含水率对海相黏土流变特性有很大影响,增加含水率可削弱其非线性黏弹性,土样更易屈服,黏度降低。【Objective】To study the effects of different moisture content on the rheological properties of marine clay and analyze the mechanism of its rheological properties.【Method】With the aid of large oscillation shear tests,the effects of moisture content on the rheological properties of marine clay were investigated from the aspects of storage/loss modulus,nonlinear viscoelasticity,yield stress and plastic viscosity.【Result】The storage modulus value and the peak value of loss modulus were consistent with the sensitivity of moisture content.The variation law of plastic viscosity and yield stress with moisture content of marine clay was obtained by numerical fitting.【Conclusion】The nonlinear viscoelasticity of marine clay can be characterized by Lissajous curve.Moisture content has great influence on the rheological characteristics of marine clay,and the increase of moisture content will weaken the nonlinear viscoelasticity of marine clay,making the sample more likely to yield and reducing its viscosities.

关 键 词：流变学 海相黏土 含水率 非线性黏弹性 

分 类 号：P642.1[天文地球—工程地质学] TU41[天文地球—地质矿产勘探]