基于生物降解下的城市垃圾填埋场边坡稳定的研究
发布时间：2018-11-11 12:25
【摘要】：垃圾是人类日常生活和生产中产生的固体废弃物,随着城乡一体化进程的发展,社会和经济的进步,越来越多的人口转移到城市,使得城镇人口不断的增加,进而导致城市垃圾和生活垃圾物产量不断增多,所以对于垃圾的处理是事关城市稳定成长和人身健康的重要措施。在我国对于垃圾的处理方法主要是垃圾填埋。垃圾填埋场以其具有技术可靠、经济节约、填埋方便和使用广泛等优点成为我国最经济有效的城市垃圾处理方法。而垃圾填埋场最重要的是边坡的稳定性,边坡的失稳每年都对我国社会经济和人身伤亡造成重大损失,所以为了保护人民的生命安全和减少经济损失,垃圾填埋场的边坡稳定研究是重中之重,而且对于环境保护具有重要的意义。本文对国内外边坡稳定性分析的背景和进展做了阐述,对边坡破坏模式和破坏机理进行了探讨,介绍了国内外常用的相关屈服准则和边坡稳定性分析方法,主要有数值模拟分析方法和极限平衡分析法。由于生物降解的作用,导致垃圾填埋场不同深度的强度参数不尽相同,填埋的越深时间越长的垃圾,降解的程度比后填埋的深,强度参数更大,所以对其进行了研究。随着现代科学技术的迅猛发展,基于计算机的数值模拟方法也得到了快速发展。通过室内外试验对垃圾试样进行测定,确定了垃圾填埋场进行数值模拟分析所需要的基本物理力学参数,使用边坡稳定分析方法并通过有限元软件FLAC3D对锦州市南山垃圾填埋场运行过程中和封场后的边坡稳定性进行分析研究,主要研究结论如下:(1)用FLAC3D数值模拟研究垃圾填埋场的边坡稳定性,充分考虑了生物降解的作用,填埋场垃圾有机质因微生物降解,垃圾土在不同深度土工参数不尽相同这一因素,对垃圾填埋场在进行分层填埋的情况进行了边坡稳定性模拟。(2)对边坡模拟的应力和位移进行了分析,发现其竖向最大位移多集中于边坡的坡顶部位,最大位移值为-4.93m;封场后水平方向的位移多集中于边坡接近坡脚处,最大位移值为-8.66m,负值表示与初始设定的方向相反。而应力的大小不管是水平方向还是竖直方向都是随着埋深的增加而增大的。(3)在生物降解的作用下,对垃圾填埋场进行分层处理,然后对其边坡稳定性进行了详细的研究,得到了边坡的塑性区域和滑动面,得出了封场后的安全系数为1.64,符合相关规范所规定的,并且计算出运营过程中的安全系数是随着填埋高程的增加而变小的。
[Abstract]:Garbage is the solid waste produced in the daily life and production of human beings. With the development of urban-rural integration process and the progress of society and economy, more and more people are transferred to the city, which makes the urban population increase continuously. As a result, the output of municipal solid waste and domestic waste is increasing, so the disposal of garbage is an important measure for the steady growth and health of the city. In our country, landfill is the main method of garbage disposal. Because of its advantages of reliable technology, economical saving, convenient landfill and wide use, landfill has become the most economical and effective method for the treatment of municipal solid waste in China. The most important thing in the landfill site is the stability of the slope. The instability of the slope causes great losses to our country's social economy and personal casualties every year. Therefore, in order to protect the safety of the people's lives and reduce the economic losses, The study on slope stability of landfill is the most important and important for environmental protection. In this paper, the background and progress of slope stability analysis at home and abroad are expounded, the failure mode and failure mechanism of slope are discussed, and relevant yield criteria and slope stability analysis methods commonly used at home and abroad are introduced. There are numerical simulation analysis method and limit equilibrium analysis method. Because of the effect of biodegradation, the intensity parameters of different depth of landfill site are different. The deeper the landfill is, the deeper the degradation degree is, and the stronger the intensity parameter is. With the rapid development of modern science and technology, computer-based numerical simulation methods have been developed rapidly. The basic physical and mechanical parameters needed for the numerical simulation analysis of the landfill site were determined by indoor and outdoor tests. Using the method of slope stability analysis and finite element software FLAC3D, the slope stability of Nanshan Landfill site in Jinzhou City during operation and after closure is analyzed and studied. The main conclusions are as follows: (1) FLAC3D numerical simulation is used to study the slope stability of landfill site, and the effect of biodegradation is fully considered. The organic matter of landfill waste is degraded by microorganism. Based on the fact that the soil parameters are different in different depth, the slope stability of the landfill is simulated. (2) the stress and displacement of the slope simulation are analyzed. It is found that the maximum vertical displacement is mostly concentrated at the top of the slope, and the maximum displacement is -4.93 m. The displacement of horizontal direction after closure is mostly concentrated near the slope foot, the maximum displacement value is -8.66 m, the negative value is opposite to the initial direction. However, the magnitude of stress increases with the increase of burial depth, regardless of horizontal direction or vertical direction. (3) under the action of biodegradation, the landfill site is stratified, and the slope stability is studied in detail. The plastic region and sliding surface of the slope are obtained, and the safety factor after sealing is 1.64, which is in accordance with the relevant code, and the safety factor in operation is reduced with the increase of landfill height.
【学位授予单位】：辽宁工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X705
本文编号：2324826
[Abstract]:Garbage is the solid waste produced in the daily life and production of human beings. With the development of urban-rural integration process and the progress of society and economy, more and more people are transferred to the city, which makes the urban population increase continuously. As a result, the output of municipal solid waste and domestic waste is increasing, so the disposal of garbage is an important measure for the steady growth and health of the city. In our country, landfill is the main method of garbage disposal. Because of its advantages of reliable technology, economical saving, convenient landfill and wide use, landfill has become the most economical and effective method for the treatment of municipal solid waste in China. The most important thing in the landfill site is the stability of the slope. The instability of the slope causes great losses to our country's social economy and personal casualties every year. Therefore, in order to protect the safety of the people's lives and reduce the economic losses, The study on slope stability of landfill is the most important and important for environmental protection. In this paper, the background and progress of slope stability analysis at home and abroad are expounded, the failure mode and failure mechanism of slope are discussed, and relevant yield criteria and slope stability analysis methods commonly used at home and abroad are introduced. There are numerical simulation analysis method and limit equilibrium analysis method. Because of the effect of biodegradation, the intensity parameters of different depth of landfill site are different. The deeper the landfill is, the deeper the degradation degree is, and the stronger the intensity parameter is. With the rapid development of modern science and technology, computer-based numerical simulation methods have been developed rapidly. The basic physical and mechanical parameters needed for the numerical simulation analysis of the landfill site were determined by indoor and outdoor tests. Using the method of slope stability analysis and finite element software FLAC3D, the slope stability of Nanshan Landfill site in Jinzhou City during operation and after closure is analyzed and studied. The main conclusions are as follows: (1) FLAC3D numerical simulation is used to study the slope stability of landfill site, and the effect of biodegradation is fully considered. The organic matter of landfill waste is degraded by microorganism. Based on the fact that the soil parameters are different in different depth, the slope stability of the landfill is simulated. (2) the stress and displacement of the slope simulation are analyzed. It is found that the maximum vertical displacement is mostly concentrated at the top of the slope, and the maximum displacement is -4.93 m. The displacement of horizontal direction after closure is mostly concentrated near the slope foot, the maximum displacement value is -8.66 m, the negative value is opposite to the initial direction. However, the magnitude of stress increases with the increase of burial depth, regardless of horizontal direction or vertical direction. (3) under the action of biodegradation, the landfill site is stratified, and the slope stability is studied in detail. The plastic region and sliding surface of the slope are obtained, and the safety factor after sealing is 1.64, which is in accordance with the relevant code, and the safety factor in operation is reduced with the increase of landfill height.
【学位授予单位】：辽宁工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X705
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