山谷型生活垃圾卫生填埋场封场后堆体稳定性研究  

Investigation on the Dump Stability After the Closure of the Valley-type Sanitary Landfill of Domestic Waste

作　　者：王凤侠 兰天 戴世金 杜玉凤 宋迎春[2] 张焕伟 WANG Fengxia;LAN Tian;DAI Shijin;DU Yufeng;SONG Yingchun;ZHANG Huanwei(Shenzhen Baoan District Urban Appearance and Environment Comprehensive Management Service Center,Shenzhen Guangdong 518101;School of Environment,Tsinghua University,Beijing 100084)

机构地区：[1]深圳市宝安区市容环境综合管理服务中心,广东深圳518101 [2]清华大学环境学院,北京100084

出　　处：《环境卫生工程》2022年第3期77-83,89,共8页Environmental Sanitation Engineering

摘　　要：以南方某封场的垃圾填埋场为研究对象,通过监测封场膜上覆盖土水分饱和情况、表面位移情况、垃圾坝深层水平位移情况,结合覆土和堆体稳定性分析,综合评价卫生填埋场封场后的稳定性。研究结果表明:填埋场封场后,一单元和二单元填埋场表面含水量的变化范围分别是0.15~0.35 g/cm^(3)和0.10~0.45 g/cm^(3),覆土的体积含水量受降水影响较大,总体上呈下降趋势。填埋场封场后的3 a间,垃圾坝深层侧向水平位移速率在1.0~2.0 mm/d的安全范围内。封场初期,局部表面水平位移较大,出现了超限区域,封场后2~3 a监测期间日均位移无超限现象,封场覆土自身稳定安全系数在2.09以上。但当表面覆土处于完全饱和状态时,安全系数均小于1.5,存在安全隐患。封场填埋场应继续加强安全监测,控制和减少降雨入渗,同时采取局部应急降水等措施,避免膜上覆盖土进入饱和状态。A closed landfill in the south was used as the research object,and the stability of the sanitary landfill after closure was evaluated comprehensively by monitoring the moisture saturation of the cover soil on the closure membrane,surface displacement,and deep horizontal displacement of the waste dam,combined with the analysis of overburden soil and pile stability analysis.The study results showed that after landfill closure,the variation ranges of water content on the surface of unit 1 and unit 2 landfill were 0.15~0.35 g/cm^(3) and 0.1~0.45 g/cm^(3) respectively.The volumetric water content of the overburden soil was greatly influenced by precipitation and the overall trend was decreasing.During the three years after the landfill closure,the deep lateral horizontal displacement rate of the waste dam oscillated within a safe range of 1.0~2.0 mm/d.At the early stage of the closure,the local surface horizontal displacement was large and there was an over-limit area.During the monitoring period of 2~3 years after the closure,the average daily displacement did not exceed the limit,and the safety coefficient of the closure cladding soil itself was stable above 2.09.However,when the surface cladding soil was in a fully saturated state,the safety coefficient was all less than 1.5,indicated potential safety hazards.The sealed landfill should continue to strengthen safety monitoring,control and reduce rainfall infiltration.At the same time to take local emergency precipitation and other measures to avoid the saturation state of cover soil on the closure membrane.

关 键 词：填埋场 生活垃圾 堆体 含水量 水平位移 稳定性 

分 类 号：TU433[建筑科学—岩土工程]