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为研究垃圾填埋场堆填过程中垃圾抗剪强度参数的变化规律,考虑垃圾的压缩过程及剪切位移渐变过程,采用大型固废压缩与直剪联合测定试验仪器,对288个城市新鲜垃圾试样进行系统的室内试验研究。试验材料分为3种配比,每种配比考虑3个初始孔隙比。试验压缩过程采用4级竖向压力,每级压力考虑8个压缩时间;剪切过程考虑10个剪应变限值。试验结果表明:抗剪强度参数c值和?值随着剪应变限值的增加而增加,其关系可拟合为对数表达式;在对试验数据分析的基础上,建立一个既简单又实用的对数模型,讨论模型拟合系数的变化规律,得到模型拟合系数与压缩时间的关系表达式,并给出模型拟合系数的取值范围。该模型可以预测新近填埋垃圾的抗剪强度参数,为垃圾填埋场的稳定性分析提供理论依据。
In order to study the changing law of the rubbish shear strength parameters in the landfill landfill process, considering the compressing process of the rubbish and the gradual progress of the shear displacement, a large-scale solid waste compression and direct shear test equipment was used to analyze the fresh rubbish in 288 cities The sample system for indoor test study. Test material is divided into three kinds of ratio, each ratio to consider three initial porosity ratio. The test compression process uses 4 vertical pressure, each stage of pressure to consider the 8 compression time; shear process to consider 10 shear strain limits. The experimental results show that the values of c and? Of the shear strength increase with the increase of the shear strain limit, and the relationship can be fitted to a logarithmic expression. Based on the experimental data analysis, a simple and practical The logarithmic model of the model is discussed, and the variation rule of the fitting coefficient of the model is discussed. The relational expression of the model fitting coefficient and the compression time is obtained, and the range of fitting coefficient of the model is given. The model can predict the shear strength parameters of landfill recently and provide a theoretical basis for the stability analysis of landfill.