本文選題：紅黏土溶質(zhì)運(yùn)移 + 土-水特征曲線　； 參考：《廣西大學(xué)》2017年碩士論文

【摘要】：土壤中溶質(zhì)運(yùn)移規(guī)律的研究是當(dāng)今環(huán)境巖土工程中的熱點(diǎn),但目前以紅黏土為對象的相關(guān)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(yàn)、壓汞試驗(yàn)、飽和滲透試驗(yàn)、一維土柱上滲試驗(yàn)和一維土柱蒸發(fā)試驗(yàn)研究,對廣西紅黏土溶質(zhì)運(yùn)移機(jī)理進(jìn)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(nèi)的桂林、柳州兩地紅黏土的土-水特征曲線,結(jié)果表明,在同一含水率下桂林紅黏土的基質(zhì)吸力大于柳州紅黏土,前者具有更強(qiáng)的持水能力,此現(xiàn)象主要與土壤的礦物成分、物性指標(biāo)和孔隙結(jié)構(gòu)有關(guān)。(2)結(jié)合壓汞試驗(yàn)獲得的孔徑分布的數(shù)據(jù),用毛管束模型預(yù)測桂林、柳州紅黏土的滲透系數(shù),發(fā)現(xiàn)理論值與試驗(yàn)值相差較大,主要是公式中滲透系數(shù)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(shù)理論值比較,發(fā)現(xiàn),當(dāng)桂林、柳州紅黏土的等效半徑分別取r20和r30進(jìn)行預(yù)測時,模型預(yù)測結(jié)果與實(shí)測值較吻合。(3)分別通過一維土柱上滲、蒸發(fā)試驗(yàn)研究了水分和溶質(zhì)在桂林和柳州紅黏土中的運(yùn)移規(guī)律:上滲過程中,相同條件下桂林紅黏土水分運(yùn)動和溶質(zhì)運(yùn)移速度比柳州紅黏土快,相應(yīng)的入滲體積也比柳州紅黏土多,且溶質(zhì)運(yùn)移是滯后于水分運(yùn)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(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU446

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 張娜;喬鳳超;張博;盛海龍;;深部煤系沉積巖孔隙結(jié)構(gòu)特征壓汞試驗(yàn)研究[J];煤炭科學(xué)技術(shù);2016年10期

2 常紅帥;劉麗;季春生;呂海波;;桂林、柳州兩種紅黏土的土-水特征曲線[J];桂林理工大學(xué)學(xué)報;2015年04期

3 白福高;劉偉江;文一;陳堅(jiān);;地下水溶質(zhì)遷移規(guī)律研究概述[J];環(huán)境保護(hù)科學(xué);2015年06期

4 楊宏宇;劉艷敏;白偉明;鄒洪海;;紅粘土土水特征曲線試驗(yàn)及其數(shù)學(xué)模型研究[J];四川建筑科學(xué)研究;2015年01期

5 孫德安;高游;劉文捷;韋昌富;張升;;紅黏土的土水特性及其孔隙分布[J];巖土工程學(xué)報;2015年02期

6 孫德安;劉文捷;呂海波;;桂林紅黏土的土-水特征曲線[J];巖土力學(xué);2014年12期

7 陶高梁;張季如;莊心善;楊琳;;壓縮變形影響下的土-水特征曲線及其簡化表征方法[J];水利學(xué)報;2014年10期

8 盧彬;;重金屬污染物在土壤中遷移規(guī)律及修復(fù)技術(shù)研究[J];環(huán)境科學(xué)與管理;2014年09期

9 李小平;朱偉;;土壤孔徑分布對污染物遷移過程中彌散系數(shù)的影響[J];水資源與水工程學(xué)報;2014年02期

10 金毅;宋慧波;胡斌;祝一搏;鄭軍領(lǐng);;煤儲層分形孔隙結(jié)構(gòu)中流體運(yùn)移格子Boltzmann模擬[J];中國科學(xué):地球科學(xué);2013年12期

相關(guān)碩士學(xué)位論文 前3條

1 劉麗;飽和—非飽和紅黏土中溶質(zhì)遷移機(jī)理及數(shù)值模擬[D];廣西大學(xué);2016年

2 張凡;軟土滲流的微尺度效應(yīng)分析[D];華南理工大學(xué);2015年

3 張立波;黏性土的微觀孔隙結(jié)構(gòu)試驗(yàn)研究[D];湖北工業(yè)大學(xué);2013年

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本文編號：1759820