Study of the effect of the MSW fiber content of and solid particle compressibility on its shear strength using triaxial apparatus.

Sandro Lemos Machado; Mehran Karimpour-Fard;
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It is commonly accepted that the shear strength of Municipal Solid Waste (MSW) is enhanced by thereinforcement effect of its fibrous constituents. However, most papers in the technical literature do not systematicallyevaluate the effect of the MSW fibers on its stress-strain-strength response. This paper presents results of a series oflaboratory triaxial tests performed to evaluate the effect of the MSW fiber content and solid particle compressibility on itsmechanical behavior. The variation in the MSW shear strength and shear strength parameters with fiber content and axialstrain are analyzed, the effective parameters obtained from CD and CU tests are compared and the applicability ofTerzaghi’s equation for MSW materials discussed. Test results were used to calculate the Factor of Safety, FS, for someslope geometrical configurations and the results were used to create some charts relating FS, fiber content and the slopegeometry. The authors believe this subject could be of interest to landfill management companies, especially consideringthe new trend in plastic material recycling for energy recovery purposes.