三峡库岸红层土体饱水失水过程中水土化学作用研究
发布时间：2018-08-24 16:47
【摘要】：三峡库区水位波动下,岸坡广泛分布的红层土体长期处于"饱和-失水-再饱和"过程,边坡稳定性受到显著影响,其中复杂的水土化学作用被认为是引起土体结构和力学变化的关键因素。选取石榴树包滑坡红层土体为研究对象,设计反复饱水-失水试验,分析水、土化学成分和土体矿物组成变化特征,结合热力学模拟,揭示其反复饱水-失水过程中水土化学作用规律。结果发现:饱水-失水过程显著影响库岸边坡水土化学作用,饱水过程主要发生方解石矿物溶解,该作用随着饱水-失水过程次数的增加而增强;其次该过程发生阳离子交换,以溶液中Ca~(2+)、Mg~(2+)置换出红层土体中Na~+,溶液中K~+置换出红层土体中Mg~(2+)反应为主,其中Ca~(2+)与Na~+的交换反应随饱水-失水过程次数的增加而减弱。
[Abstract]:Under the fluctuation of water level in the three Gorges Reservoir area, the red bed soil mass widely distributed on the bank slope is in the process of "saturation-water-loss re-saturation" for a long time, and the slope stability is significantly affected. The complex soil and water chemistry is regarded as the key factor to change the soil structure and mechanics. Taking the red layer soil of the pomegranate landslide as the research object, the repeated saturated water loss test was designed, and the variation characteristics of the chemical composition of water, soil and mineral composition of soil were analyzed, combined with thermodynamic simulation. It reveals the law of soil and water chemical action in the process of repeated water saturation and water loss. The results showed that the process of saturated water and water loss significantly affected the chemical action of soil and water on the bank slope of the reservoir, and the dissolution of calcite minerals mainly occurred in the process of saturated water, which increased with the increase of the times of the process of saturated water and water loss, and then the cation exchange occurred in the process. The exchange reaction between Ca~ (2) and Na~ decreases with the increase of the number of saturated water and water loss processes. The Na~ reaction in red layer soil is replaced by Ca~ (2) mg ~ (2) in solution and the Mg~ (2) reaction in red layer soil is mainly replaced by K ~ in solution.
【作者单位】： 中国地质大学(武汉)环境学院;桂林理工大学地球科学学院;桂林理工大学广西环境污染控制理论与技术重点实验室;桂林理工大学岩溶地区水污染控制与用水安全保障协同创新中心;
【基金】：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) 广西高等学校高水平创新团队及卓越学者计划项目(002401013001)
【分类号】：TV223
，
本文编号：2201418
[Abstract]:Under the fluctuation of water level in the three Gorges Reservoir area, the red bed soil mass widely distributed on the bank slope is in the process of "saturation-water-loss re-saturation" for a long time, and the slope stability is significantly affected. The complex soil and water chemistry is regarded as the key factor to change the soil structure and mechanics. Taking the red layer soil of the pomegranate landslide as the research object, the repeated saturated water loss test was designed, and the variation characteristics of the chemical composition of water, soil and mineral composition of soil were analyzed, combined with thermodynamic simulation. It reveals the law of soil and water chemical action in the process of repeated water saturation and water loss. The results showed that the process of saturated water and water loss significantly affected the chemical action of soil and water on the bank slope of the reservoir, and the dissolution of calcite minerals mainly occurred in the process of saturated water, which increased with the increase of the times of the process of saturated water and water loss, and then the cation exchange occurred in the process. The exchange reaction between Ca~ (2) and Na~ decreases with the increase of the number of saturated water and water loss processes. The Na~ reaction in red layer soil is replaced by Ca~ (2) mg ~ (2) in solution and the Mg~ (2) reaction in red layer soil is mainly replaced by K ~ in solution.
【作者单位】： 中国地质大学(武汉)环境学院;桂林理工大学地球科学学院;桂林理工大学广西环境污染控制理论与技术重点实验室;桂林理工大学岩溶地区水污染控制与用水安全保障协同创新中心;
【基金】：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) 广西高等学校高水平创新团队及卓越学者计划项目(002401013001)
【分类号】：TV223
，
本文编号：2201418
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