| 锌离子污染对膨润土一维压缩特性影响试验研究 |
| |
| 引用本文： | 刘志彬,方伟,陈志龙,余闯.锌离子污染对膨润土一维压缩特性影响试验研究[J].岩土力学,2013,34(8):2211-2219. |
| |
| 作者姓名： | 刘志彬 方伟 陈志龙 余闯 |
| |
| 作者单位： | 1.东南大学 岩土工程研究所，南京 210096；2.温州大学 建筑与土木工程学院，浙江 温州 325035 |
| |
| 基金项目： | 国家自然科学基金资助(No.41272311，No.40802065)；高等学校博士学科点专项科研基金资助(No.20100092120049)；江苏省自然科学基金重点项目资助(No. BK2010060)；浙江省自然科学基金资助(No. LY13E080013)。 |
| |
| 摘 要： | 为研究锌离子对膨润土重塑土压缩特性的影响，对人工制备的受不同浓度Zn2+污染的高含水率膨润土开展一维压缩、自由膨胀率、物理化学性质和扫描电镜试验。试验结果表明，在竖向压力低于某临界值（200 kPa）时，相同压力下随着Zn2+浓度增大，膨润土的孔隙比和压缩指数均降低，但当Zn2+浓度高于某临界值（0.02 mol/L）时，继续增加污染浓度膨润土的孔隙比基本保持不变，压缩指数略有降低。当竖向压力超过该临界值（200 kPa）后，膨润土的孔隙比基本不受孔隙液物理化学性质影响，仅由竖向压力决定。此外，随着孔隙液Zn2+浓度增大，膨润土的孔隙液pH值和土样比表面积减小，颗粒直径增大，膨润土中蜂窝状结构遭到破坏，黏土矿物片逐渐团聚成大直径颗粒，小孔隙消失，生成一些大的团粒间孔隙。
|
| 关 键 词： | 锌离子 膨润土 压缩特性 物理化学作用 微观结构 |
| 收稿时间： | 2012-06-03 |
Experimental study of influence of zinc ions on one-dimensional compressibility of bentonite |
| |
| LIU Zhi-bin
,
FANG Wei
,
CHEN Zhi-long
,
YU Chuang.Experimental study of influence of zinc ions on one-dimensional compressibility of bentonite[J].Rock and Soil Mechanics,2013,34(8):2211-2219. |
| |
| Authors: | LIU Zhi-bin FANG Wei CHEN Zhi-long YU Chuang |
| |
| Institution: | 1. Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China; 2. College of Architecture and Civil Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, China |
| |
| Abstract: | In order to study the influence of zinc ions on the compressibility of remolded bentonite, a series of tests including one-dimensional compression, free swelling ratio, physicochemical property, and scanning electron microscopy were performed on artificially prepared bentonite of high water content with different concentrations of zinc ions. Test results indicate that, when the vertical load is lower than a critical value of 200 kPa, the void ratio and compression index of the contaminated bentonite will decrease with the increasing concentration of zinc ions under a constant vertical load. However, if the concentration of zinc ions is greater than a threshold value of 0.02 mol/L, there will be little change in void ratio of bentonite; and the compression index will just decrease a little. As the vertical load is greater than 200 kPa, basically the void ratio of bentonite will not be influenced by the physicochemical property of the pore fluid but only be determined by vertical load. In addition, experimental analysis shows that as the concentration of the zinc ions increases, pH value of the pore fluid and specific surface area will be decreased; but the particle diameter will be increased. Furthermore, the dispersed structure of bentonite will be gradually destroyed; clay mineral flakes will form big aggregates; and large inter-aggregate voids will come into being due to the zinc contamination. |
| |
| Keywords: | zinc ions bentonite compressibility physico-chemical effect microstructure |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
|
