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掌握填埋废物的工程力学特性是确保危险废物填埋堆体稳定性的重要前提条件,因此,针对6种典型危险废物的工程力学特性开展了调查研究。研究结果表明,污泥类危险废物的含水率和有机质含量远高于非污泥类危险废物,而前者的比重则显著低于后者。污泥类危险废物的渗透系数相对较小,比污染土壤和飞灰炉渣混合物的渗透系数小1个数量级,比滤池填料的渗透系数小2个数量级。不同危险废物的无侧限抗压强度排序为:飞灰炉渣混合物(314.3 kPa)和滤池填料(278.9 kPa)>污染土壤(124.9 kPa)>杭州氧气厂污泥(68.6 kPa)、锌铬污泥(71.4 kPa)、油泥(58.4 kPa)。不同危险废物的粘聚力排序为:飞灰炉渣混合物(40.8 kPa)、滤池填料(31.1 kPa)>污染土壤(20.9 kPa)>杭州氧气厂污泥(1.94kPa)、锌铬污泥(3.10 kPa)、油泥(1.81 kPa)。此外,不同危险废物的内摩擦角差异相对较小,其变化范围在18.8°～35.0°之间。综合分析可知,飞灰炉渣混合物和滤池填料的工程力学特性较好,而污泥类危险废物的工程力学特性则较差。
Grasping the mechanical properties of landfill waste is an important precondition to ensure the stability of landfill stacks. Therefore, the engineering mechanical properties of six typical hazardous wastes are studied. The results show that the moisture content and organic matter content of the hazardous wastes are much higher than that of the non-sludge hazardous wastes, while the former’s proportion is significantly lower than the latter. The permeability coefficient of sludge hazardous wastes is relatively small, which is one order of magnitude smaller than the permeability coefficient of contaminated soil and fly ash slag mixture, which is two orders of magnitude smaller than that of filter packing. The unconfined compressive strengths of different hazardous wastes are sorted as follows: fly ash slag mixture (314.3 kPa) and filter packing (278.9 kPa)> contaminated soil (124.9 kPa)> Hangzhou Oxygen Plant Sludge (68.6 kPa) Mud (71.4 kPa), Sludge (58.4 kPa). The cohesion of different hazardous wastes was ranked as: fly ash slag mixture (40.8 kPa), filter packing (31.1 kPa)> polluted soil (20.9 kPa)> Hangzhou oxygen plant sludge (1.94 kPa), zinc chromium sludge kPa), sludge (1.81 kPa). In addition, the differences in the internal friction angles of different hazardous wastes are relatively small, ranging from 18.8 ° to 35.0 °. Comprehensive analysis shows that the engineering mechanical properties of fly ash slag mixture and filter packing are better, while the mechanical properties of sludge hazardous waste are poor.