Study on the Non-Linear Shear Strength Properties of Municipal Solid Waste

The direct shear test and the compression test of municipal solid waste are carried out by using large-scale test equipment to study the shear strength properties of municipal solid waste. The municipal solid waste materials are divided into three parts and an appropriate proportion is selected for them. The relationships between shear stress, shear strain, compression strain, shear strength and time are studied. Research results show that the shear stress does not vary linearly with the shear strain, and the curve of the shear stress versus shear strain is a strain hardening curve, even the shear strain exceed 20%. The curve of the vertical strain versus logarithmic time can be fitted into a fold line, and the relationship between the initial void ratio and logarithmic time can also be fitted into a fold line. Besides, the curve of the shear stress and the logarithmic shear strain can be fitted into a linear line, and the slope of the line is at the same value of0.97. On the basis of the experiments, a new model has been presented which is simple and has less parameters.