摘要
为深入探究土壤的非线性流变特性,以某省工业区周边重金属污染土壤为研究对象,制备重金属污染非饱和土壤样本,设计实验过程与施压方案后,利用伯格斯土流变模型表达蠕变性,通过力学试验研究受重金属污染后的非饱和土壤的蠕变性能。研究结果表明重金属污染非饱和土壤应力数值较低时,其蠕变形式表现为瞬时位移;水平加载的应力数值越高,重金属污染非饱和土壤的蠕变量逐渐增加,其蠕变形式由等速蠕变逐渐转向加速蠕变;重金属污染的非饱和土壤内含水率数值越高,土壤的蠕变数值越大;非饱和土壤内的重金属含量和种类与其蠕变率成正比例关系。
In order to explore the nonlinear rheological characteristics of soil,this paper takes the heavy metal contaminated soil around an industrial zone in a province as the research object.Samples of heavy metal contaminated unsaturated soil were prepared.After designing the experimental process and pressure scheme,the creep property was expressed by Burgess soil rheological model,and the creep performance of unsaturated soil contaminated by heavy metals was studied by mechanical test.The results show that when the stress value of unsaturated soil polluted by heavy metals is low,its creep form is instantaneous displacement.The higher the stress value of horizontal loading is,the creep amount of unsaturated soil polluted by heavy metals gradually increases,and its creep form gradually changes from constant velocity creep to accelerated.The higher the moisture content in unsaturated soil polluted by heavy metals,the larger the creep value of soil.The content and types of heavy metals in unsaturated soils are directly proportional to their creep rate.
作者
李梓豪
陶子程
Li Zihao;Tao Zicheng(Chang'an University, Xi'an 710000, China;Xinhua College, Ningxia University, Yinchuan 750001, China)
出处
《环境科学与管理》
CAS
2022年第4期123-128,共6页
Environmental Science and Management
关键词
重金属污染
非饱和土壤
蠕变力学
试验研究
垂直应力
heavy metal pollution
unsaturated soil
creep mechanics
experimental study
vertical stress
