發(fā)布時間：2018-10-25 18:23

【摘要】：我國江河湖泊眾多,為保障河道的暢通和泄洪,每年需要定期清理河道淤泥。而對河道淤泥廢物利用已經(jīng)成為專家的共識。另外,生活水平隨著經(jīng)濟(jì)的發(fā)展得到了長足的進(jìn)步,焚燒的生活垃圾熱值越來越高,對生活垃圾焚燒爐渣(簡稱MSWI爐渣)的運用也成為學(xué)者關(guān)注的焦點。對河道淤泥和MSWI爐渣的資源化利用,可有效地解決工程用土需求。本文以河道淤泥為原料土、MSWI爐渣為混合料、氣泡為輕質(zhì)材料、水泥為固化劑、經(jīng)過一定的工藝制成混合MSWI河道淤泥氣泡混合土(簡稱混合土)。這種新型土工材料具有輕質(zhì)、環(huán)保等性能,摻入爐渣后,其高強(qiáng)特性更加顯著。通過室內(nèi)土工試驗,研究了摻入爐渣對混合土物理力學(xué)性質(zhì)的影響。利用ImageJ軟件的數(shù)字圖像處理技術(shù)分析了混合土的微觀構(gòu)造參數(shù)與其強(qiáng)度與變形等特性的相關(guān)性。⑴混合土的物理性質(zhì):研究了MSWI爐渣摻量、氣泡摻量、水泥摻量和含水量對混合土密度和滲透性能的影響。氣泡摻量對密度影響非常顯著�；旌贤恋臐B透系數(shù)基本都在10-7cm/s數(shù)量級,具有較好的抗?jié)B透性能,能夠滿足實際工程需求。⑵混合土的強(qiáng)度特性:通過力學(xué)試驗探討了混合土強(qiáng)度特性�；旌贤恋膹�(qiáng)度特性受MSWI爐渣摻量、氣泡摻量、含水量等因素影響顯著。研究結(jié)果表明,混合土的無側(cè)限抗壓強(qiáng)度和抗剪強(qiáng)度參數(shù)c,φ值隨MSWI爐渣摻量增加而增大,隨氣泡摻量增加而減小。⑶混合土的變形特性:通過標(biāo)準(zhǔn)固結(jié)試驗等試驗方法,分析了混合土的變形特性。隨著荷載的增大,混合土的累計變形明顯增加。在同一荷載級別下,MSWI爐渣摻量越大,混合土的軸向應(yīng)變越小。摻入爐渣后,增強(qiáng)了混合土抵抗變形的能力。此外探討了混合土的變形模量和破壞應(yīng)變與各組摻量的關(guān)系。⑷混合土的微觀構(gòu)造特性:通過數(shù)字圖像技術(shù),分析了摻入爐渣對混合土微觀構(gòu)造參數(shù)影響。研究了平均等效孔徑、微孔數(shù)量、大小微孔數(shù)量比等微觀構(gòu)造參數(shù)與混合土物理力學(xué)性質(zhì)的相關(guān)性。比較混合土加載前后的微觀構(gòu)造參數(shù)的變化,探討了其破壞機(jī)理。
[Abstract]:There are many rivers and lakes in our country. In order to ensure the smooth flow and flood discharge, it is necessary to clear the silt regularly every year. And the use of river silt waste has become a consensus among experts. In addition, with the development of economy, the standard of living has made great progress, and the calorific value of domestic waste incinerator (MSW) is higher and higher. The application of MSW incinerator slag (MSWI slag) has also become the focus of attention of scholars. The utilization of channel silt and MSWI slag can effectively meet the needs of engineering soil. In this paper, the mixed MSWI channel silt mixed soil (short for mixed soil) is made by using channel silt as raw material, MSWI slag as mixture, bubble as light material and cement as curing agent. The new geotextile has the properties of light weight, environmental protection and so on. The effect of slag addition on the physical and mechanical properties of mixed soil was studied through laboratory geotechnical tests. Using the digital image processing technology of ImageJ software, the correlation between the microstructure parameters of mixed soil and its properties of strength and deformation is analyzed. 1 the physical properties of mixed soil: the content of MSWI slag and the amount of bubble are studied. Effects of cement content and moisture content on density and permeability of mixed soil. The effect of bubble content on density is very significant. The permeability coefficient of mixed soil is basically in the order of 10-7cm/s, which has good permeability resistance and can meet the practical engineering requirements. 2 strength characteristics of mixed soil: the strength characteristics of mixed soil are discussed through mechanical tests. The strength characteristics of mixed soil are significantly affected by MSWI slag content, bubble content, water content and so on. The results show that the unconfined compressive strength and shear strength parameter c, 蠁 of mixed soil increase with the increase of MSWI slag content, and decrease with the increase of bubble content. The deformation characteristics of mixed soil are analyzed. With the increase of load, the cumulative deformation of mixed soil increases obviously. At the same load level, the axial strain of mixed soil decreases with the increase of MSWI slag content. After adding slag, the resistance of mixed soil to deformation is enhanced. In addition, the relationship between the deformation modulus and failure strain of mixed soil and the amount of mixed soil was discussed. 4 the microstructure characteristics of mixed soil: the influence of slag on the microstructure parameters of mixed soil was analyzed by digital image technology. The correlation between the average equivalent pore size, the number of micropores and the ratio of the number of micropores to the physical and mechanical properties of mixed soils was studied. The microstructure parameters of mixed soil before and after loading were compared and the failure mechanism was discussed.
【學(xué)位授予單位】：蘇州科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU521.3

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