ULTRA-LARGE DIRECT SHEAR TEST FOR SHEAR STRENGTH PROPERTIES OF ARTIFICIAL MUNICIPAL SOLID WASTE

The materials of municipal solid waste(MSW)can be divided into three parts. They are respectively the materials of easily degradation, difficulty degradation, and incompressibility. Their proportions are 50%, 15%, and 35%,respectively. Their shear strength properties and parameters are examined with an ultra-large direct shear test equipment. The artificial MSW is tested in a geo-environmental laboratory. The test results show that the compression time and shear strain are two key factors for MSW shear strength. The relationship between the shear strength and the vertical pressure applied on the test samples conforms to follow the frictional law of Mohr-Coulomb. Besides, the shear strength parameters of MSW are obtained with the initial void ratio equaling 2.9 under different compression times and different shear strains. The cohesion varies from 9.69 to 15.64kPa. The internal friction angle varies from 18.73to 35.53.