利用毛细吸力强化垃圾填埋场封场系统的导排性研究

发布时间：2018-06-27 12:52

本文选题：垃圾填埋场 + 封场系统　；参考：《西南交通大学》2017年硕士论文

【摘要】：大气降雨后导排不良是威胁生活垃圾填埋场结构安全的一大隐患,垃圾填埋堆体上方存在的大量积水也是垃圾渗滤液产生量增加的潜在源头。强化封场系统导排性能的研究是保证生活垃圾填埋场稳定安全运行的迫切需要。本研究拟利用毛细透排水带的毛细吸力强化植被土层的导排能力,以达到强化填埋场封场系统导排性的目的。本研究在对国内外垃圾填埋场封场系统结构及阻塞原因等方面研究进行综述的基础上,通过模拟大气降雨试验,采用单因素分析,确定大气降雨强度、支持土层的土质和排水带高度、布设密度、布设位置、是否设置专用排水管等因素对强化导排效果的影响;利用正交试验法,研究砂土、粉质粘土和粘土支持土层中,影响强化导排效果的因素的变化规律,提出所选水平范围内的最佳布置方式。研究表明,将毛细透排水带利用在垃圾填埋场封场系统植被层可以显著强化其雨水导排性能,且封场系统的导排性能越差,毛细透排水带的强化导排效果越显著。因此,利用毛细透排水带毛细、虹吸和水的表面张力等作用强化生活垃圾填埋场封场系统的导排性能在理论上和实践中均是可行的,一方面减少了垃圾渗滤液的产生量,另一方面也保护了填埋堆体的结构安全稳定。具有良好的经济、社会以及环境效益。本研究可为填埋场封场系统的导排性能强化提供思路和依据。
[Abstract]:Poor conductance and discharge after atmospheric rainfall is a major threat to the structural safety of domestic refuse landfill. A large amount of water in the top of landfill is also a potential source for the increase of landfill leachate production. It is an urgent need to strengthen the research on the guiding and discharging performance of the sealing system to ensure the stable and safe operation of the landfill site. In this study, the capillary suction of capillary permeable drainage zone was used to enhance the capacity of soil conductivity and drainage of vegetation, so as to enhance the permeability of landfill sealing site system. On the basis of summarizing the structure of landfill site sealing system and the reason of blockage at home and abroad, this study determines the intensity of atmospheric rainfall by simulated atmospheric rainfall test and single factor analysis. The influence of soil quality and drainage zone height of supporting soil layer, layout density, placement location, whether or not special drainage pipe are set on the effect of strengthening guiding and drainage, the orthogonal test method is used to study sand, silty clay and clay supporting soil. The change law of the factors affecting the effect of strengthening the guide and discharge is proposed, and the optimum arrangement within the selected horizontal range is put forward. The results show that the application of capillary permeable drainage zone in the vegetation layer of landfill site sealing system can significantly enhance the Rain Water guiding and drainage performance, and the worse the sealing field system is, the more significant the enhanced guiding and drainage effect of capillary permeable drainage zone is. Therefore, it is feasible in theory and in practice to use capillary permeability, siphon and surface tension of water to enhance the performance of landfill sealing site system, on the one hand, to reduce the amount of landfill leachate. On the other hand, it also protects the structure safety and stability of the landfill. Good economic, social and environmental benefits. This study can provide the train of thought and basis for strengthening the guiding and discharging performance of landfill sealing system.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X705

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