城市垃圾填埋场的沉降研究

Research on settlement of municipal refuse landfill

通过对位于上海老港填埋场的3000 m2试验场(垃圾填埋高度4 m,填入垃圾10800 t)历时880 d的沉降监测,根据垃圾在填埋场中的降解机理,建立了反映填埋场沉降规律的数学模型,证明了模型的可靠性。研究表明,填埋场的第二阶段沉降(由于垃圾的生物降解而产生的)与填埋时间的指数呈线性关系。根据沉降规律,上海老港填埋场完成大约79%的第二阶段沉降,才能处于高稳定化状态。

In this work, a large-scale experimental landfill(3000×4 m3)with 10, 800 tons of refuse were filled. The settlement was analyzed within 880 days, from April 1995 to September 1997. Mathematical models, based on the mechanism of refuse biodegradation in the landfill, were established to simulate the relationship between the settlement and the time. It was proved that mathematical models were reliable and should be accurate for prediction the settlement of landfills. The secondary settlement, which mainly results from the slow and gradual refuse degeneration, is linear with respect to the exponent of refuse age. According to the settlement models and as for as the Shanghai Laogang landfill is concerned, it may be predicted that about 79% of secondary settlement will be finished before the landfill is in high stabilization condition.