填埋场温度干预现场试验及分析

External disturbance field test for landfill temperature and analysis

垃圾土在填埋场降解过程中,除了填埋气和渗滤液,热量也是填埋过程中的主要副产物。储存在填埋场中的热量使得垃圾体持续高温,高温对填埋气、衬垫系统以及填埋体工程性质都会产生影响。目前,关于填埋场热干预的现场试验还远未开展。以无锡市桃花山生活垃圾卫生填埋场为工程背景,开展了填埋场温度干预现场试验。现场试验在新填埋层中埋设单根U型循环管,垃圾土中埋设了温度传感器进行温度监测。试验结果表明:干预试验最大影响半径为6.3~7.0 m,最大降温幅度为1.3~3.0℃;水平和垂直方向的垃圾土受到温度干预影响范围不同,影响范围内的垃圾土降温幅度接近。试验设计的水循环系统一定程度能降低垃圾土温度。

In the process of degradation for MSW（ Municipal Solid Waste） in landfill,besides LFG and leachate,heat is also the primary by-product of the landfill. Heat stored in the landfill results in long-term elevated waste temperature. Elevated temperature influences LFG generation, base liners and engineering properties of landfill. Currently, there is no field test carrying out so far. The external dis-turbance test for landfill temperature has been carried out in Taohuashan landfill. Circulating pipes were buried in new landfill layer in the field test. Temperature sensors were buried in the wastes around the pipes. The following conclusions were drawn ： maximum radius of influence for the disturbance test is between 6 . 3 -7. 0 m,maximum range of temperature reduction is between 1 . 3 -3. 0 ℃ ; the range of influence is different for the horizontal and vertical direction of wastes affected by the disturbance test,the range of temperature reduc-tion for wastes in the same direction is basically the same. The selected design of water circulation system can reduce the waste tempera-ture to a certain extent.