不同浓度ZnCl2污染粉质黏土强度特性试验  

Experimental Study on Strength Characteristics of Silty Clay Polluted by Different Concentrations of ZnCl2

作　　者：吴炎 丁姝昱 赵浩楠 潘子晴 张志军 胡坤 WU Yan;DING Shu-yu;ZHAO Hao-nan;PAN Zi-qing;ZHANG Zhi-jun;HU Kun(Changzhou University Huaide College,Jingjiang 214500,China;School of Environmental&Safety Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学怀德学院,江苏靖江214500 [2]常州大学环境与安全工程学院,江苏常州213164

出　　处：《土木工程与管理学报》2020年第6期108-112,123,共6页Journal of Civil Engineering and Management

基　　金：深部岩土力学与地下工程国家重点实验室开放基金(SKLGDUEK1704);泰州市科技支撑计划项目(泰科计[2018]21号)。

摘　　要：为研究重金属污染对土体工程性质的影响,以电镀企业中的ZnCl2废水为对象,选取靖江市典型粉质黏土层。通过配置浓度为0.5%,1%,2%,3%的ZnCl2污染土进行室内实验,并采用SEM进行微观分析,探究不同浓度的ZnCl2溶液对土体强度特性的影响。研究结果表明:随着ZnCl2浓度的增加,土体的液限、塑限以及塑性指数都呈现出先降低再增加最后降低的趋势,土体粘聚力先急剧降低再增加最后趋于平缓,但是内摩擦角则先增加再降低而后趋于平缓,土体的无侧限抗压强度随ZnCl2浓度的增加呈现断崖式下降后趋于平缓;污染土的压缩模量与压缩系数两者变化趋势相反,前者先增加后减小、后者先减小后增大;同时,土体强度特性的突变皆出现在ZnCl2浓度为0.5%处,土体颗粒间的胶结物溶解作用是强度变化起主导因素。In order to study the influence of heavy metal pollution on the engineering properties of soil,the typical silty clay layer in Jingjiang City was selected by taking ZnCl2 wastewater from electroplating enterprises as the object.And to explore the influence of different concentrations of ZnCl2 solution on the strength characteristics of soil,indoor experiments were carried out with the concentrations of 0.5%,1%,2%,3%ZnCl2 polluted soils,and SEM was used to analyze the microstructure.The results show that:with the increase of ZnCl2 concentration,the liquid limit,plastic limit and plasticity index of soil show a trend of first decreasing,then increasing and finally decreasing,the cohesion of soil first decreases sharply,then increases,and finally tends to be gentle,however,the internal friction angle first increases and then decreases,and then tends to be gentle,the unconfined compressive strength of soil decreases like a cliff,and then tends to be gentle.The change trend of the compression modulus and compression coefficient of polluted soil is opposite,the former increases first and then decreases,and the latter decreases and then increases.At the same time,the abrupt change of soil strength characteristics occurs at the concentration of 0.5%ZnCl2,and the dissolution of cement among soil particles is the dominant factor of strength change.

关 键 词：ZnCl 2污染 粉质粘土 室内试验 强度特性 

分 类 号：TU449[建筑科学—岩土工程]