城市垃圾填埋场沉降模型的研究

Settlement model of municipal solid waste landfill

研究了城市垃圾填埋场的沉降变形机理,提出了计算沉降量的模型,模型由荷载应力下的压缩沉降和有机物降解后的压缩沉降两项组成.结合具体工程实例,研究了填埋场的库容,计算了填埋场封场后的沉降量,并给出了沉降量随时间的变化规律.研究表明,初始孔隙比、有机物含量及有机物的降解率是影响填埋场沉降的主要因素;沉降量随时间呈指数衰减,衰减系数为0.10～0.14.

After analyzing the settlement mechanism of municipal solid waste (MSW) landfill, a new landfill settlement model is put forward, which contained less parameters and the parameters could be calculated. The model consists of two parts: the compression due to the self-weight stress, and the compression due to the degradation of the organic substance in the landfill. The storage capacity and the settlement of Tianziling MSW landfill are predicted by applying the model. The results show that the settlement is affected by the initial void, the content of organic substance and the degradation ratio of organic substance in the MSW. The settlement versus time relationship follows an exponential decay curve, and the modulus decay is determined to be 0.10-0.14.