典型生活垃圾填埋场堆体安全监测及堆高稳定性分析

为了解生活垃圾填埋场堆体堆高稳定性变化，以南方某典型生活垃圾卫生填埋场为研究对象，开展为期1年的堆体安全监测。通过布设渗沥液水位、堆体表面位移和深层侧向位移等在线监测设备，获取连续稳定的堆体安全特征数据。并使用GeoStudio软件分析填埋高度和渗沥液水位对边坡稳定性的影响。结果表明，填埋场滞水位埋深摆动幅度为0~4 m，主水位降低幅度为1~2 m，渗沥液水位高度、表面位移速率受降雨量和填埋作业影响较为明显；填埋初期，堆体持续向外滑移，日均滑移速率在1~8 mm·d⁻¹；堆体作业区域由于堆体厚度大、堆填速率快，其深层侧向位移速率大于两侧边坡区域，雨季滑移速率大于旱季，1年内表层累计水平位移可达到950 mm。渗沥液水位对填埋堆体稳定性有较大影响，随着渗沥液水位的下降，堆体安全系数逐渐增大，填埋场警戒水位埋深可设为5.0 m。本研究结果可为垃圾填埋场的堆体安全稳定控制提供参考。

Monitoring and stability analysis of a typical domestic waste sanitary landfill site

In view of the stability of domestic waste landfill, a typical sanitary landfill in south China was taken as the research object, and the safety monitoring of the landfill was carried out for one year. By arranging on-line monitoring equipment such as leachate level, surface displacement and deep lateral displacement, the continuous data of safety characteristics were obtained. GeoStudio software is furthermore used to analyze the influence of landfill height and leachate level on slope stability. The results showed that the stagnant water level of the landfill fluctuated between 0-4 m, and the main water level decreased between 1-2 m. The water level height and surface displacement rate of leachate are obviously affected by rainfall and landfill operation in local area. At the initial stage of landfill, the pile body continued to slip outward, and the average daily slip rate was 1-8 mm/d. Because of the large thickness of the heap and the fast filling rate, the deep horizontal displacement rate of the operation area is higher than that of the two side slopes, and the sliding rate in rainy season is higher than that in dry season. The accumulated lateral displacement of the surface layer reached 950 mm in one year. The results showed that leachate level has great influence on the stability of landfill. With the decline of leachate level, the safety factor of landfill gradually increases, and the buried depth of the warning level of landfill can be set to 5.0 m. These results can provide important support for the safety and stability control of landfill.