發(fā)布時(shí)間：2018-08-24 16:47

【摘要】：三峽庫(kù)區(qū)水位波動(dòng)下,岸坡廣泛分布的紅層土體長(zhǎng)期處于"飽和-失水-再飽和"過(guò)程,邊坡穩(wěn)定性受到顯著影響,其中復(fù)雜的水土化學(xué)作用被認(rèn)為是引起土體結(jié)構(gòu)和力學(xué)變化的關(guān)鍵因素。選取石榴樹(shù)包滑坡紅層土體為研究對(duì)象,設(shè)計(jì)反復(fù)飽水-失水試驗(yàn),分析水、土化學(xué)成分和土體礦物組成變化特征,結(jié)合熱力學(xué)模擬,揭示其反復(fù)飽水-失水過(guò)程中水土化學(xué)作用規(guī)律。結(jié)果發(fā)現(xiàn):飽水-失水過(guò)程顯著影響庫(kù)岸邊坡水土化學(xué)作用,飽水過(guò)程主要發(fā)生方解石礦物溶解,該作用隨著飽水-失水過(guò)程次數(shù)的增加而增強(qiáng);其次該過(guò)程發(fā)生陽(yáng)離子交換,以溶液中Ca~(2+)、Mg~(2+)置換出紅層土體中Na~+,溶液中K~+置換出紅層土體中Mg~(2+)反應(yīng)為主,其中Ca~(2+)與Na~+的交換反應(yīng)隨飽水-失水過(guò)程次數(shù)的增加而減弱。
[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.
【作者單位】： 中國(guó)地質(zhì)大學(xué)(武漢)環(huán)境學(xué)院;桂林理工大學(xué)地球科學(xué)學(xué)院;桂林理工大學(xué)廣西環(huán)境污染控制理論與技術(shù)重點(diǎn)實(shí)驗(yàn)室;桂林理工大學(xué)巖溶地區(qū)水污染控制與用水安全保障協(xié)同創(chuàng)新中心;
【基金】：國(guó)家自然科學(xué)基金青年基金項(xiàng)目(41502232;407002059) 廣西礦冶與環(huán)境科學(xué)實(shí)驗(yàn)中心項(xiàng)目(KH2012ZD004) 廣西高等學(xué)校高水平創(chuàng)新團(tuán)隊(duì)及卓越學(xué)者計(jì)劃項(xiàng)目(002401013001)
【分類號(hào)】：TV223
，

本文編號(hào)：2201418