关键词: 填埋场, 竖向改建, 压缩沉降, 不均匀沉降, 防渗衬层

Abstract: Based on the settlement experience model of Swoers and so on, a settlement calculation method of Chinese domestic waste landfills provided by Zhejiang University, combined with the characteristics of high-food-waste domestic waste, has been used to calculate the primary and secondary compression settlement, as well as the uneven settlement of vertical reconstruction of domestic waste landfills. The actual project settlements was monitored and compression settlement characteristics was analyzed. Additionally, the mechanical properties of different impermeable materials were collected to analyze their applicability in the engineering application of vertical reconstruction of domestic waste landfills. The results showed that the primary compression settlement had a short duration, while the secondary compression settlement lasted for 30 to 50 years. The compression settlement is nonlinearly proportional to the depth of the underlying domestic waste body and the height of the fly ash body, with the settlement rate decreasing as the depth and height increase. The landfilling slope ratio of the waste body is an important factor affecting uneven settlement, and it is recommended that the slope of the fly ash body be less than 1∶3 to ensure that the tensile strain of the impermeable lining is less than 10%. With the adoption of engineering measures such as bidirectional geogrids and buffer layers, combinations of materials such as HDPE membranes and geotextiles can be used as impermeable linings for vertical reconstruction, and the use of sodium bentonite waterproof blankets and clay in vertical reconstruction is not recommended.

Key words: landfill, vertical reconstruction, compression settlement, uneven settlement, impermeable lining