混合MSWI河道淤泥气泡混合土的工程性质试验研究
发布时间：2018-10-25 18:23
【摘要】：我国江河湖泊众多,为保障河道的畅通和泄洪,每年需要定期清理河道淤泥。而对河道淤泥废物利用已经成为专家的共识。另外,生活水平随着经济的发展得到了长足的进步,焚烧的生活垃圾热值越来越高,对生活垃圾焚烧炉渣(简称MSWI炉渣)的运用也成为学者关注的焦点。对河道淤泥和MSWI炉渣的资源化利用,可有效地解决工程用土需求。本文以河道淤泥为原料土、MSWI炉渣为混合料、气泡为轻质材料、水泥为固化剂、经过一定的工艺制成混合MSWI河道淤泥气泡混合土(简称混合土)。这种新型土工材料具有轻质、环保等性能,掺入炉渣后,其高强特性更加显著。通过室内土工试验,研究了掺入炉渣对混合土物理力学性质的影响。利用ImageJ软件的数字图像处理技术分析了混合土的微观构造参数与其强度与变形等特性的相关性。⑴混合土的物理性质:研究了MSWI炉渣掺量、气泡掺量、水泥掺量和含水量对混合土密度和渗透性能的影响。气泡掺量对密度影响非常显著。混合土的渗透系数基本都在10-7cm/s数量级,具有较好的抗渗透性能,能够满足实际工程需求。⑵混合土的强度特性:通过力学试验探讨了混合土强度特性。混合土的强度特性受MSWI炉渣掺量、气泡掺量、含水量等因素影响显著。研究结果表明,混合土的无侧限抗压强度和抗剪强度参数c,φ值随MSWI炉渣掺量增加而增大,随气泡掺量增加而减小。⑶混合土的变形特性:通过标准固结试验等试验方法,分析了混合土的变形特性。随着荷载的增大,混合土的累计变形明显增加。在同一荷载级别下,MSWI炉渣掺量越大,混合土的轴向应变越小。掺入炉渣后,增强了混合土抵抗变形的能力。此外探讨了混合土的变形模量和破坏应变与各组掺量的关系。⑷混合土的微观构造特性:通过数字图像技术,分析了掺入炉渣对混合土微观构造参数影响。研究了平均等效孔径、微孔数量、大小微孔数量比等微观构造参数与混合土物理力学性质的相关性。比较混合土加载前后的微观构造参数的变化,探讨了其破坏机理。
[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.
【学位授予单位】：苏州科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU521.3
本文编号：2294468
[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.
【学位授予单位】：苏州科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU521.3
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