【摘要】：環(huán)境污染增大了云南地區(qū)庫(kù)水中氯離子的含量,從而形成大量的HC1對(duì)筑壩紅土造成侵蝕；而用于土石壩防滲加固的傳統(tǒng)材料中水泥與石灰被廣泛采用,其水化后產(chǎn)生大量的Ca(OH)2亦長(zhǎng)期緩慢侵蝕著弱酸性的筑壩紅土。鑒于上述情況,本文分別開(kāi)展了HC1和Ca(OH)2侵蝕筑壩紅土的化學(xué)加速壽命試驗(yàn)、受蝕紅土的室內(nèi)土工試驗(yàn)及其受損化學(xué)成分的離子濃度檢測(cè)試驗(yàn)。通過(guò)對(duì)試驗(yàn)數(shù)據(jù)的整理與分析,明確了HC1和Ca(OH)2侵蝕對(duì)筑壩紅土的工程特性及化學(xué)成分所引起的變化；并從化學(xué)反應(yīng)和細(xì)觀演變角度著手,定性地闡明了受蝕筑壩紅土工程特性與化學(xué)成分的變化機(jī)理以及二者之間存在的緊密聯(lián)系；據(jù)此采用多元逐步回歸分析方法,分別建立了HC1和Ca(OH)2侵蝕筑壩紅土的各主要工程特性指標(biāo)與受損化學(xué)成分的量化關(guān)系模型。 結(jié)果表明：(1)HC1消耗了筑壩紅土中起到包裹、膠結(jié)作用的化學(xué)成分Fe203和Al2O3,致使酸蝕筑壩紅土的工程特性發(fā)生變化,主要表現(xiàn)為滲透系數(shù)K、內(nèi)摩擦角φ壓縮系數(shù)αv,、液性指數(shù)IL以及粉粒含量Ps增大,而凝聚力c、比重Gs、塑性指數(shù)IP以及粘粒含量PC則減�。�(2)Ca(OH)2消耗了筑壩紅土中起到膠結(jié)、填充作用的化學(xué)成分Si02.Ti02和Al2O3,從而引起堿蝕筑壩紅土工程特性的改變,主要體現(xiàn)為滲透系數(shù)K、壓縮系數(shù)αv、液性指數(shù)IL以及粉粒含量Ps均增大,而凝聚力c、內(nèi)摩擦角φ、比重Gs、塑性指數(shù)IP以及粘粒含量PC都減小；(3)酸蝕筑壩紅土各主要工程指標(biāo)的回歸方程中,除了c、φ、Gs的校正決定系數(shù)略偏低(R2adj=0.541～0.692),其他指標(biāo)K、av、Ip、IL、Ps、Pc的校正決定系數(shù)均在0.700以上(R2adi=0.729～0.937)；(4)對(duì)于堿蝕筑壩紅土各主要工程指標(biāo)的回歸方程,除了φ、αv的校正決定系數(shù)略偏低(R2adj=0.555～0.657),其他指標(biāo)K、c、Gs、Ip、IL、Ps、Pc的校正決定系數(shù)也都在0.700以上(R2adj=0.707-0.898)；(5)筑壩紅土的受損化學(xué)成分含量對(duì)大部分工程指標(biāo)的變化的解釋程度都在70%以上,可見(jiàn)在酸堿侵蝕筑壩紅土中,主要工程指標(biāo)的變化與化學(xué)成分的受損存在著顯著的量化關(guān)系,據(jù)此可以為紅土室內(nèi)土工試驗(yàn)的結(jié)果評(píng)價(jià)和數(shù)據(jù)取舍提供參考,又可以為深入研究關(guān)于評(píng)估土石壩病害程度和預(yù)測(cè)土石壩使用壽命的方法提供一個(gè)新思路。
[Abstract]:Environmental pollution increased the content of chloride ions in reservoir water in Yunnan, resulting in the formation of a large number of HC1 to dam-building laterite erosion; In addition, cement and lime are widely used in the traditional materials used for seepage prevention and reinforcement of earth-rock dams. After hydration, a large amount of Ca (OH)-2 also slowly erodes the weakly acidic red earth of dam-building. In view of the above situation, the chemical accelerated life test of HC1 and Ca (OH) 2 eroded laterite, the indoor geotechnical test of corroded red soil and the ion concentration test of damaged chemical composition were carried out in this paper. Through the analysis of the test data, the change of the engineering characteristics and chemical composition caused by the erosion of HC1 and Ca (OH) 2 on the dam-building red soil was clarified. From the point of view of chemical reaction and meso-evolution, the change mechanism of engineering characteristics and chemical composition of corroded red earth and the close relationship between them are expounded qualitatively. Based on the method of multiple stepwise regression analysis, the quantitative relation models between the main engineering characteristics and the damaged chemical composition of HC1 and Ca (OH) 2 eroded red soil are established respectively. The results show that: (1) HC1 consumes the envelopes in dam-building red soil, and the chemical composition of cementation, Fe203 and Al2O3, results in the change of engineering characteristics of acid-etched laterite. The main results are as follows: permeability coefficient K, internal friction angle 蠁 compression coefficient 偽 _ v, internal friction angle 蠁 compression coefficient 偽 _ v, etc. Liquid index (IL) and powder content (Ps) increased, but cohesion c, specific Gs, plasticity index (IP) and clay content (PC) decreased. (2) Ca (OH) 2 consumes the cementitious and filling chemical composition Si02.Ti02 and Al2O3, which lead to the change of the engineering characteristics of alkaline erosion laterite, which is mainly reflected in the permeability coefficient K, compression coefficient 偽 v, and so on. Liquid index IL and powder content Ps increased, while cohesion c, internal friction angle 蠁, specific Gs, plasticity index IP and clay content PC decreased. (3) in the regression equation of the main engineering indexes of red soil, except for c, 蠁, Gs, the correction determining coefficient (R2adj=0.541~0.692) is slightly lower, the other indexes K, v, I p, IL, PS, K, V, I p, IL, PS, etc. The correction decision coefficients of Pc were above 0.700 (R2adi=0.729~0.937). (4) for the regression equation of the main engineering indexes of red soil, except 蠁 and 偽 v, the correction determining coefficient (R2adj=0.555~0.657) is slightly lower, the other indexes K, c, GS, Ip, IL, PS, and so on. The correction decision coefficients of Pc were also above 0.700 (R2adj=0.707-0.898); (5) the degree of interpretation of the content of damaged chemical composition of dam-building red soil to most engineering indexes is more than 70%, so it can be seen in acid-alkali erosion of red soil for dam-building. There is a significant quantitative relationship between the change of main engineering indexes and the damage of chemical composition, which can be used as a reference for the evaluation of the results and the selection of data of the geotechnical test in the laboratory of lateritic soil. It can also provide a new idea for the in-depth study on the assessment of the degree of earth-rock dam disease and the prediction of the service life of the earth-rock dam.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TV221.2;P642.132

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