【摘要】：隨著高速公路建設(shè)的不斷發(fā)展,路堤填料改良問題越來越受到重視。常見的固化技術(shù)中,無機(jī)固化劑具有獨(dú)特優(yōu)勢(shì),但仍存在適用性有限、配比實(shí)驗(yàn)繁瑣等問題。固化劑存在局限性根本在于迄今尚未形成系統(tǒng)的、實(shí)用的固化劑設(shè)計(jì)理論和方法。因此,開展對(duì)路堤填料的無機(jī)改性的機(jī)理研究有其重大意義。本文選取蘇北地區(qū)常見的低液限粉土作為研究對(duì)象,對(duì)該土進(jìn)行無機(jī)化學(xué)改性,結(jié)合物理化學(xué)表征、熱力學(xué)計(jì)算和宏觀力學(xué)試驗(yàn)對(duì)路堤填料的化學(xué)改性機(jī)理進(jìn)行了系統(tǒng)研究,主要研究工作和成果如下：(1)通過分析蘇北地區(qū)經(jīng)歷的沉積歷史和沉積環(huán)境,分析該地區(qū)低液限粉土工程地質(zhì)性質(zhì)較差的原因,并結(jié)合室內(nèi)基礎(chǔ)土工試驗(yàn)以及XRD、BET等試驗(yàn)對(duì)該低液限粉土的基本物理性質(zhì)、礦物成分及微觀結(jié)構(gòu)等進(jìn)行研究,為粉土的無機(jī)化學(xué)改性做準(zhǔn)備。(2)結(jié)合土的化學(xué)成分,利用化學(xué)反應(yīng)數(shù)據(jù)庫并結(jié)合前人的研究成果,選取能夠與土中化學(xué)成分發(fā)生化學(xué)反應(yīng)并能轉(zhuǎn)化為膠結(jié)材料的化學(xué)物質(zhì)作為固化劑；根據(jù)固體表面化學(xué)、化學(xué)熱力學(xué)、表面自由能理論等基本原理估算固化劑的添加配比,確定試驗(yàn)方案。(3)跟蹤不同養(yǎng)護(hù)時(shí)間的土的成分、浸出液成分及浸出液PH值等的變化情況。對(duì)各試驗(yàn)方案中所添加的改性劑組分與素土之間的化學(xué)反應(yīng)速率、反應(yīng)程度等化學(xué)動(dòng)力學(xué)各方面進(jìn)行綜合分析,借此推測(cè)改性機(jī)理。(4)開展微觀宏觀試驗(yàn),對(duì)路堤填料的無機(jī)改性結(jié)果進(jìn)行研究,驗(yàn)證根據(jù)無機(jī)化學(xué)基本原理確定的試驗(yàn)方案及固化劑配比的有效性。具體內(nèi)容包括：A顆粒粒徑、級(jí)配分析。對(duì)比包括素土在內(nèi)的11個(gè)不同試驗(yàn)方案的試樣的顆粒粒徑特征。通過分析各試驗(yàn)方案的各粒組的百分含量、級(jí)配曲線圖以及最大最小粒徑,證明了所選試劑的合理性。B礦物成分分析。采用X射線衍射(XRD)手段,對(duì)各組試樣的礦物定性定量分析,根據(jù)Gibbs自由能原理,計(jì)算改性前后各試驗(yàn)方案的△G的變化情況；結(jié)合顆粒的粒徑大小分析礦物成分與土的粒徑之間的關(guān)系。C比表面積分析。采用BET比表面積測(cè)試手段,對(duì)各組試樣的比表面積、孔徑分布進(jìn)行測(cè)試,根據(jù)比表面積的變化情況,分析各試驗(yàn)方案的表面自由能的變化趨勢(shì)與礦物成分變化之間的關(guān)系。D加州承載比(CBR)試驗(yàn)。通過CBR試驗(yàn)?zāi)M在受水浸泡的最不利的情況下土樣的強(qiáng)度,分析各組試樣的水穩(wěn)性,結(jié)合分析了礦物成分、顆粒級(jí)配、比表面積對(duì)土的CBR值的影響；并計(jì)算了11組樣品的吉布斯自由能,通過對(duì)比改性前后的自由能的改變,探討了體系的熱力學(xué)性質(zhì)與土的宏觀力學(xué)特性之間的關(guān)系。本文將無機(jī)化學(xué)中的能量最小原理、Gibbs自由能原理以及固體表面化學(xué)的相關(guān)原理,應(yīng)用到路基填料的無機(jī)化學(xué)改性技術(shù)中,利用土的表面積計(jì)算得到了添加劑的配比,并通過微觀、宏觀試驗(yàn)相結(jié)合,驗(yàn)證了試驗(yàn)配方及配比的合理性,驗(yàn)證了無機(jī)化學(xué)反應(yīng)的基本原理應(yīng)用到路堤填料改良中的可行性。
[Abstract]:With the continuous development of highway construction, the improvement of embankment packing has been paid more and more attention. In the common curing technology, the inorganic curing agent has unique advantages, but there are still limited applicability and tedious experiment. The limitation of the curing agent is that the curing agent has not yet formed a systematic, practical curing agent design theory and a practical design theory. Therefore, it is of great significance to carry out the study on the mechanism of inorganic modification of embankment fillers. In this paper, the common low liquid limit silt in North Jiangsu is selected as the research object. The inorganic chemical modification, physical and chemical characterization, thermodynamic calculation and macro mechanical test of the soil are carried out to the chemical modification mechanism of embankment fillers. The main research work and achievements are as follows: (1) by analyzing the sedimentary history and sedimentary environment of the northern Jiangsu Province, the reasons for the poor engineering geological properties of the low liquid limit silt in this area are analyzed, and the basic physical properties, mineral composition and microstructure of the low liquid limit silt, including the laboratory foundation soil test and the XRD and BET tests, are combined. Study, prepare for the inorganic chemical modification of silt. (2) combining the chemical composition of soil, using the chemical reaction database and combining the previous research results, the chemical substance which can react with the chemical composition of the soil and can be converted into cemented material is selected as the curing agent; according to the surface chemistry, chemical thermodynamics, surface of the surface The basic principles of free energy theory are used to estimate the adding ratio of the curing agent and determine the test scheme. (3) the changes in the composition of soil, the composition of the leaching solution and the pH value of the leaching solution, and the chemical reaction rate and the degree of reaction between the modifier and the plain soil added in the various test schemes. Comprehensive analysis is carried out to conjecture the modification mechanism. (4) carry out micro macro test, study the inorganic modification results of embankment filling, verify the effectiveness of the test scheme and the ratio of the curing agent determined according to the basic inorganic chemistry principle. The specific content includes: the particle size of A particles, the gradation analysis, and the comparison of 11 different tests including the plain soil. By analyzing the content of the particle size, the gradation curve and the maximum minimum particle size of each test scheme, the mineral composition analysis of the selected reagents is proved by the analysis of the mineral composition of the selected reagents. Using the X ray diffraction (XRD) method, the qualitative and quantitative analysis of the minerals of each sample is made, and the.B is calculated and modified according to the principle of Gibbs free energy. The variation of delta G in each test program before and after sex, and the analysis of the relation between the mineral composition and the particle size of the soil with the particle size of the particles is analyzed. The specific surface area and pore size distribution of each sample are tested by means of BET specific surface area test, and the surface of each test plan is analyzed according to the change of specific surface area. The relationship between the change trend of free energy and mineral composition.D California bearing ratio (CBR) test. Through the CBR test, the strength of soil samples was simulated under the most unfavorable condition of water immersion, the water stability of each sample was analyzed, and the influence of mineral composition, particle size distribution and specific surface area on the CBR value of soil was analyzed, and 11 groups of samples were calculated. The relationship between the thermodynamic properties of the system and the macroscopic mechanical properties of soil is discussed by comparing the changes of the free energy before and after the modification of the Gibbs free energy. In this paper, the principle of energy minimum, the principle of Gibbs free energy and the related principles of solid surface chemistry in the inorganic chemistry are applied to the inorganic chemical modification technology of the subgrade packing. In addition, the ratio of the additives is obtained by the calculation of the surface area of the soil, and the rationality of the formula and proportion is verified through the combination of microcosmic and macroscopic tests. The feasibility of the basic principle of inorganic chemical reaction to the improvement of embankment fillers is verified.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U414;U416.12

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