城市生活垃圾卫生填埋场沉降变形分析

Analysis on Settlement Deformation of Municipal Solid Waste Sanitary Landfill Site

摘要:

城市生活垃圾填埋场地基沉降和垃圾堆体沉降受到的影响因素多，现行规范的计算方法直接采用与实际相差较大，为减少不均匀沉降对垃圾防渗层的影响、准确确定垃圾储量和保证垃圾堆体的稳定，开展垃圾填埋场沉降研究具有重要意义。垃圾填埋场沉降变形包括地基沉降和垃圾堆体沉降，垃圾堆体沉降又分为主沉降和次沉降，主沉降完成时间短于次沉降。通过对陕西省宝鸡市垃圾填埋场地基土进行沉降计算，最大沉降差超过100 mm，对垃圾防渗层不利影响较大；而对垃圾堆体沉降计算，修正后的计算值与沉降观测值非常接近。考虑不同地区地层差异和垃圾成分差异，积累沉降观测资料具有重要意义。

关键词:生活垃圾填埋场;密实度;沉降变形;固结;沉降观测;防渗层

Abstract:

There are many factors that affect the settlement of the landfill site foundation and the MSW body, great difference exists between direct use of the calculation method of the current standard and the actual actual practice. In order to reduce the influence of uneven settlement on the impermeable layer of landfill, determine the refuse storage and ensure the stability of the garbage heap, it is necessary to make research on settlement of MSW landfill site. The settlement of the landfill site includes the settlement of foundation and the settlement of MSW, and the latter is divided into main settlement and the second settlement, the main settlement time is shorter than the secondary one. Through the settlement calculation of the foundation soil of a landfill site in Baoji City, the maximum settlement difference is more than 100mm, which has a great adverse effect on impermeable layer of landfill site, and for the calculation of the settlement of MSW body, the modified calculation value is very close to the observed value of settlement. Considering the difference of the regions and the garbage composition, the accumulation of observed data is of great significance.

Key words:MSW landfill site; compactness; settlement deformation; consolidation; settlement observation; impermeable layer