| Prevention of Seepage of Unsaturated Clay by Chemical Treatment |
| |
| 作者姓名： | 徐则民 杨立中 刘丹 |
| |
| 作者单位： | Department of Civil Engineering，Kunming University of Science and Technology，School of Civil Engineering，Southwest Jiaotong University，School of Civil Engineering，Southwest Jiaotong University Kunming 650224，China，Chengdu 610031，China，Chengdu 610031，China |
| |
| 基金项目： | 国家自然科学基金，云南省自然科学基金，Key Research Project Fund of Ministry of Education |
| |
| 摘 要： | Introduction Asanimperviousbarrier ,clayiswidelyusedinmanyfieldssuchaswasteisolation .Theimperviousnessofclayisstableinzoneofsaturation ,butnotstableinzoneofaerationasaresultofalternatewettinganddrying ,whichinducesstructuralporeanddryingfractureandrai…
|
Prevention of Seepage of Unsaturated Clay by Chemical Treatment |
| |
| Xu Zemin,Yang Lizhong Liu Dan.Prevention of Seepage of Unsaturated Clay by Chemical Treatment[J].Journal of Southwest Jiaotong University,2003,11(1). |
| |
| Authors: | Xu Zemin Yang Lizhong Liu Dan |
| |
| Institution: | 1. Department of Civil Engineering, Kunming University of Science and Technology, Kunming 650224, China
2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China |
| |
| Abstract: | The aim of the study is to seek a simple and inexpensive method to prevent the permeability rise of unsaturated clay caused by evaporation process and to raise its imperviousness. Taking Chengdu clay as an example, four treatment schemes were tried. Na 2CO 3 could reduce conspicuously the permeability of the saturated clay, but could not limit the permeability rise in the alternate wetting and drying process. NaOH had a similar effect to Na 2CO 3. NaCl could not only decrease the saturated hydraulic conductivity, but could also effectively contain the permeability rise caused by evaporation. CH 3COONa had a similar effect to NaCl. The mechanism of Na 2CO 3, NaOH, NaCl and CH 3COONa decreasing the saturated hydraulic conductivity of the clay is that Na transformed Ca montmorillonites in the original clay into Na montmorillonites and the transformation reduces the sizes of effective pores and the effective porosity of the clay. |
| |
| Keywords: | unsaturated clay seepage prevention montmorillonite Chengdu clay |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
