底渣为城市生活垃圾焚烧后的产物,具有砂性材料的性质,可作为路基的填料。为研究其抗剪性能,将其与黏土进行混合,分别在两种压实度和4种黏土含量下进行室内大型直剪试验。试验结果得到了8种底渣混合土的黏聚力和内摩擦角。试验结果表明:① 压实后的底渣具有良好的抗剪性能,随着底渣含量的增加,底渣混合土的抗剪强度增加,黏聚力下降,内摩擦角增加;② 随着压实度的增加,底渣的抗剪性能增加,黏聚力明显增加,内摩擦角有所下降。

Bottom ash, as a product of municipal solid waste incineration, similiar to sand soil, can be used as filling material in subgrade. In order to explore the shear strength indexes of the bottom ash, we mixed the bottom ash with clay of different contents and carried out indoor large direct shear tests under two different degrees of compaction. Through the tests, we obtained the values of cohesion and internal friction angle of eight kinds of mixed soils. Results show that 1) compacted bottom ash has good shear resistant ability, and with the increasing of bottom ash content, shear strength and internal friction angle increased, while cohesion decreased; 2) with the increasing of compactness, shear resistant ability increased, cohesion obviously increased, but internal friction angle decreased a little.