污泥掺入生活垃圾后的力学特性试验研究

填埋是污泥消化处置的方法之一，由于污泥的工程特性较特殊，填埋会引发很多环境岩土工程问题。考虑到填埋工程会进行分层碾压铺填，在标准击实试验的击实功下制备试样，通过污泥与垃圾土混合后的直接剪切试验、渗透特性试验，考虑淋滤液和降解产气压力共同影响，进行边坡稳定分析。结果表明：污泥和垃圾混合后的强度比垃圾土的强度低，比污泥的强度高，改善了污泥的强度特性；污泥掺入垃圾后的渗透系数与垃圾土的渗透系数相当，没有劣化垃圾土的渗透特性，但比污泥的渗透系数有显著提高；随着污泥掺量的增加，边坡安全系数会先提高后降低，因此，应结合试验和稳定计算结果，确定实际工程的污泥掺入比；考虑降解产气对边坡稳定的影响，安全系数会降低约15%～20%。

Mechanical behavior test study of sludge mixed with municipal solid waste

Filling is one of the processing methods for sludge disposal. In landfill of sludge there will be some geoenvironmental problems for sludge has special engineering characteristics. Layered rolling is used in landfill and test samples are prepared under energy of standard compaction test. The test results of shear strength and permeability coefficient for sludge mixed with municipal solid waste (MSW) as well as stability analysis of slope are presented, considering the effects of leachate and pore air pressure from degradation. It is shown that the strength of sludge mixed with MSW is lower than MSW and higher than sludge; strength characteristic of sludge is improved. Permeability coefficient of sludge mixed with MSW is a light different from MSW; permeability is not obviously worse than MSW and is higher than sludge. With the increase of sludge content, slope stability will increase firstly and then decrease. The suitable mixing content of dewatered sludge will be determined by results of test and slope stability analysis. The safety factor of slope stability analysis will decrease about 15%-20% considering the effect of pore air pressure from degradation.