废旧轮胎加筋对生物反应器填埋场稳定的影响

发布时间：2018-12-16 21:53

【摘要】：生活垃圾处理成为世界各国面临的问题,现代卫生填埋技术是目前垃圾处置最重要的方式之一。生物反应器垃圾填埋场着眼于从垃圾的生化反应中获得绿色能源,并更有效地利用填埋空间,因而符合可持续发展的理念,对其研究和改进具有重要的现实意义。因此,本文首次提出使用捆扎废旧轮胎在生物反应器填埋场中形成垃圾体的“加强网络”,以提高垃圾的抗滑坡能力和渗滤液回灌效率;并采用理论分析和数值模拟相结合的方法进行了一系列研究,主要内容如下:(1)基于废旧轮胎加筋在生物反应器内部形成空间加筋网络的理念,通过研究渗流和边坡稳定分析时的相关理论,建立了双渗透介质模型、固体力学动量平衡方程和边坡稳定分析相耦合的计算模型,并制定了使用有限元软件COMSOL模拟时的耦合方法。(2)根据建立的计算模型,对生物反应器填埋场在水平沟槽(Horizontal Trench)中渗滤液的回灌进行数值模拟。结果表明,连续性渗滤液回灌时废旧轮胎加筋填埋场可提高回灌流速,并使渗滤液分布更加均匀,从而促进生化反应;而且,填埋场边坡稳定性分析显示加筋后边坡稳定性得到明显改善。(3)考虑到渗滤液间歇式回灌的方式允许采用更高的注射压强而提高效率,本文对间歇回灌时废旧轮胎加筋的影响进行了研究。结果表明,在渗透效率相近的前提下,轮胎网的存在可以减少水平沟槽的数量,并且大大改善垃填埋场的边坡稳定性;同时,加筋可进一步提高注射压强。(4)在填埋实践中,渗滤液回灌也可采取竖井(Vertical Well)进行疏导,因此本文对竖井回灌时废旧轮胎加筋的效果进行了模拟,并研究垃圾的不均匀性和各向异性对渗滤液回灌的影响,以及竖井的构型配置。结果表明,垃圾的不均匀性和各向异性可以加快渗滤液的迁移、提高渗滤液分布的均匀性,采用浅层竖井和深层竖井相结合的方式为最优化的配置方式。本文研究发现废旧轮胎加筋具有很好的应用前景,本文的研究成果可以为未来的生物反应器填埋场的设计提供技术参考。
[Abstract]:Disposal of domestic waste has become a problem all over the world, and modern sanitary landfill technology is one of the most important ways to dispose garbage. The bioreactor landfill is focused on obtaining green energy from the biochemistry reaction of the refuse and making more effective use of the landfill space, which is in line with the concept of sustainable development and has important practical significance for its research and improvement. Therefore, in this paper, it is the first time to use strapped waste tires to form a "strengthened network" of garbage in the bioreactor landfill, in order to improve the landslide resistance and leachate recharge efficiency. A series of studies are carried out by combining theoretical analysis and numerical simulation. The main contents are as follows: (1) based on the idea of forming a spatial reinforcement network in the bioreactor, By studying the relevant theories of seepage and slope stability analysis, a two-permeable medium model, a momentum equilibrium equation of solid mechanics and a coupled calculation model for slope stability analysis are established. The coupling method using finite element software COMSOL is developed. (2) according to the established calculation model, the landfill leachate recharge in horizontal trench (Horizontal Trench) is simulated numerically. The results show that continuous leachate reinjection can increase the velocity of recharge and make the leachate distribute more evenly, thus promoting biochemical reaction. Moreover, the stability analysis of landfill slope shows that the slope stability is obviously improved after reinforcement. (3) considering that the leachate intermittent recharge method allows for higher injection pressure, the efficiency can be improved. In this paper, the effect of reinforcement on waste tires during intermittent recharge is studied. The results show that the existence of tire mesh can reduce the number of horizontal grooves and greatly improve the slope stability of landfill site. At the same time, reinforcement can further increase the injection pressure. (4) in landfill practice, leachate recharge can also be dredged by shaft (Vertical Well). The effects of inhomogeneity and anisotropy of garbage on leachate recharge and the configuration of shaft were studied. The results show that the heterogeneity and anisotropy of garbage can accelerate the transfer of leachate and improve the uniformity of leachate distribution. In this paper, it is found that the reinforcement of waste tires has a good application prospect, and the research results in this paper can provide a technical reference for the design of bioreactor landfill in the future.
【学位授予单位】：江苏大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X799.3

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