污泥与城市生活垃圾混填的力学特性及稳定性

工业污水和生活污水排放量日益增多,污水处理厂污泥产量日趋加大,污泥填埋关键技术问题已成为当今环境工程以及环境岩土工程的热点问题之一。污泥和垃圾混合填埋在其他国家已得到应用,但由于目前中国关于污泥及其城市生活垃圾混合样的基础性室内试验成果不多,对污泥与城市垃圾混合样的工程力学特性及其混合填埋的适宜比例等不甚了解,从而导致中国污泥垃圾混合填埋工程事故频繁发生。对不同配比的污泥与城市生活垃圾混合样进行了固结压缩实验、三轴固结不排水实验、无侧限抗压强度实验,得出污泥与城市生活垃圾混合样的工程力学特性;同时,用ANSYS数值模拟方法,对不同配合比的污泥城市生活垃圾混合填埋边坡的稳定性进行分析,从而对污泥与城市生活垃圾混合填埋的适宜配合比及其稳定安全问题提出理论支撑。

Mechanical properties and stability analysis of sludge-municipal solid waste mixture landfill

With the increase of sludge production of wastewater treatment plants, sludge treatment has become one of the hot topics in environmental engineering and environmental geotechnical engineering. Sludge-municipal solid waste(MSW) mixture landfill has been applied abroad. But the current domestic foundational laboratory test result of MSW mixture sample is not much,there is a lack of understanding on its mechanical properties and the appropriate proportion of mixed landfill. Hence domestic sludge-municipal solid waste(MSW) mixture landfill engineering accidents occur frequently. Consolidation compression experiments, three axis consolidated undrained tests and unconfined compressive strength tests are conducted to disscuss the mechanical properties of different mixing ratio of sludge-municipal solid waste(MSW) mixture. At the same time, ANSYS numerical simulation is operated to analyze the slope stability of landfill with different mixing ratio of sludge-municipal solid waste(MSW) mixture. The theoretical support on the appropriate proportion of mixed landfill and stability security of sludge-municipal solid waste mixture landfill is proposed.