本文選題：紅黏土溶質運移 + 土-水特征曲線　； 參考：《廣西大學》2017年碩士論文

【摘要】：土壤中溶質運移規(guī)律的研究是當今環(huán)境巖土工程中的熱點,但目前以紅黏土為對象的相關研究開展較少。本文對桂林、柳州兩地紅黏土開展了全吸力土-水特征曲線試驗、壓汞試驗、飽和滲透試驗、一維土柱上滲試驗和一維土柱蒸發(fā)試驗研究,對廣西紅黏土溶質運移機理進行探討,取得了以下成果:(1)使用壓力板法、濾紙法和飽和鹽溶液法測定了全吸力范圍內的桂林、柳州兩地紅黏土的土-水特征曲線,結果表明,在同一含水率下桂林紅黏土的基質吸力大于柳州紅黏土,前者具有更強的持水能力,此現象主要與土壤的礦物成分、物性指標和孔隙結構有關。(2)結合壓汞試驗獲得的孔徑分布的數據,用毛管束模型預測桂林、柳州紅黏土的滲透系數,發(fā)現理論值與試驗值相差較大,主要是公式中滲透系數取決于孔隙的平均半徑r50,通過對不同等效半徑的滲透系數理論值比較,發(fā)現,當桂林、柳州紅黏土的等效半徑分別取r20和r30進行預測時,模型預測結果與實測值較吻合。(3)分別通過一維土柱上滲、蒸發(fā)試驗研究了水分和溶質在桂林和柳州紅黏土中的運移規(guī)律:上滲過程中,相同條件下桂林紅黏土水分運動和溶質運移速度比柳州紅黏土快,相應的入滲體積也比柳州紅黏土多,且溶質運移是滯后于水分運動的;蒸發(fā)過程中,柳州紅黏土脫濕速度比桂林紅黏土快。
[Abstract]:The study of solute migration in soil is a hot topic in environmental geotechnical engineering nowadays, but there are few researches on red clay.In this paper, the full-suction soil-water characteristic curve test, mercury injection test, saturated permeation test, one-dimensional soil column infiltration test and one-dimensional soil column evaporation test were carried out on red clay in Guilin and Liuzhou.The mechanism of solute transport of red clay in Guangxi was discussed. The following results were obtained: 1) the soil-water characteristic curves of red clay in Guilin and Liuzhou were measured by pressure plate method, filter paper method and saturated salt solution method.At the same water content, the matrix suction of red clay in Guilin is greater than that in Liuzhou red clay, and the former has stronger water holding capacity, which is mainly related to the mineral composition of soil.The permeability coefficient of Guilin and Liuzhou red clay was predicted by capillary bundle model, and the difference between theoretical value and experimental value was found.The permeability coefficient mainly depends on the average radius of pore r50. By comparing the theoretical values of permeability coefficient of different equivalent radii, it is found that when the equivalent radii of Guilin and Liuzhou red clay are predicted by R20 and R30, respectively,The model prediction results are in good agreement with the measured values.) the evaporation experiments were conducted to study the migration of water and solute in the red clay of Guilin and Liuzhou by means of one-dimensional soil column infiltration.Under the same conditions, the water movement and solute migration of Guilin red clay are faster than that of Liuzhou red clay, and the corresponding infiltration volume is larger than that of Liuzhou red clay, and the solute migration lags behind the water movement.The dehumidification speed of Liuzhou red clay is faster than that of Guilin red clay.
【學位授予單位】：廣西大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU446

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本文編號：1759820