关键词: 垃圾土, 好氧降解, 厌氧降解, 预测模型, 干重度

Abstract: The effects of aerobic degradation on the geotechnical parameters of municipal solid waste (MSW) are complex and variable. As a key parameter of MSW, dry density plays a significant role in assessing the stabilization of aerobic degradation. This study focuses on typical MSW from Wuhan, conducting model tests on six groups under different conditions. The model tests are divided into two parts: anaerobic and aerobic conditions. The results of model tests indicate that water level height, anaerobic storage duration, and aerobic ventilation frequency are key factors affecting the mechanical properties of MSW. The modified primary compression index ranges from 0.174 to 0.452 and is inversely proportional to water level height. During the anaerobic phase, the modified secondary compression index ranges from 0.015 4 to 0.16, whereas in the aerobic ventilation phase, the modified secondary compression index varies from 0.01 to 0.78, showing an inverse relationship with water level height and a direct relationship with aerobic ventilation frequency. Additionally, the aerobic strain efficiency is proposed to characterize the strain characteristics of MSW under varying aerobic ventilation conditions. The aerobic strain efficiercy is directly proportional to aerobic ventilation frequency, while inversely proportional to water level height and anaerobic storage duration. A Logistic model is introduced to describe the variation pattern of organic matter mass in MSW, enabling the prediction of stabilization time for degradation. Finally, based on the strain-settlement model and the mass variation model, a predictive model for dry density of MSW is established.

Key words: municipal solid waste, aerobic degradation, anaerobic degradation, prediction model, dry unit weight