Engineering mechanical properties of typical hazardous wastes
典型危险废物的工程力学特性

Understanding engineering mechanical properties of the landfill waste is an important premise condition to ensure the stability of the hazardous waste landfill body. Engineering mechanical properties of six typical hazardous waste samples were investigated. The results show that the water contents and organic matter contents of sludge-class hazardous waste are much higher than that of non-sludge-class hazardous wastes, but the specific gravity of the former is significantly lower than that of the latter. Permeability coefficient for sludge-class hazardous waste is relatively small, which is an order of magnitude smaller than that of contaminated soil and fly ash / slag mixture, and two orders of magnitude smaller than that of filter filling materials. Unconfined compressive strength for different hazardous wastes are: fly ash / slag mixture (314.3 kPa) and filter filling materials (278.9 kPa) > contaminated soil (124.9 kPa) > Hangzhou Oxygen Plant sludge (68.6 kPa), zinc / chrome sludge (71.4 kPa), oil sludge (58.4 kPa). Cohesion value lists of different hazardous wastes are: fly ash / slag mixture (40.8 kPa), filter filling materials (31.1 kPa) > contaminated soil (20.9 kPa) > Hangzhou Oxygen Plant sludge (1.94 kPa), zinc / chrome sludge (3.10 kPa), oil sludge (1.81 kPa). In addition, internal friction angle differences of different hazardous wastes are relatively small, its change in the range of 18.8° to 35.0°. Comprehensive analysis, engineering mechanical properties for the fly ash / slag mixture and filter filling materials are better, and engineering mechanical properties for the sludge-class hazardous wastes are poor.