桂林理工大学学报2017，Vol.37Issue(3)：444-450,7.DOI:10.3969/j.issn.1674-9057.2017.03.008
三峡库岸红层土体饱水失水过程中水土化学作用研究
Study on chemical reactions during red soil soaked and dehydrated processes in Three Gorges Reservoir area
摘要
Abstract
In the Three Gorges Reservoir area,red soil is widely distributed and its stability is significantly influenced by fluctuation of river water level.Complicated chemical reactions between water and red soil are the key factors caused changes of soil structure and mechanical property.In this study,red soil samples were collected from the Shiliushubao landslides of the Three Gorges Reservoir area.They were repeatedly soaked by water and dehydrated for three times.In these processes,water samples were collected for analysis of conventional anionic and cationic contents,and soil samples were collected for analysis of mineral and chemical compositions and contents.Thermodynamic models were then established to identify the critical chemical reactions of red soil and water.Results show that in the soil soaked (SS) and soil dehydrated (SD) processes,the major chemical reaction is calcite dissolution and will be enhanced with the increased SS and SD processes.Then follows the cation exchange reaction,mainly including of Ca2+ and Mg2+ exchanged Na+ from red soil,K + exchanged Mg2+ from red soil,in which,Ca2+ and Na+ will be weakened with the increased SS and SD processes.关键词
红层土体/饱水-失水过程/热力学模拟/水土化学作用Key words
red soil/soil soaked and dehydrated processes/thermodynamic model/water-soil chemical reaction分类
天文与地球科学引用本文复制引用
彭三曦,单慧媚,梁和成,蔡鹤生,李义连..三峡库岸红层土体饱水失水过程中水土化学作用研究[J].桂林理工大学学报,2017,37(3):444-450,7.基金项目
国家自然科学基金青年基金项目(41502232 （）
407002059) （）
广西矿冶与环境科学实验中心项目(KH2012ZD004) （KH2012ZD004）
广西高等学校高水平创新团队及卓越学者计划项目(002401013001) （002401013001）
