Study On The Influence Of Different Factors On The Degradation Of Municipal Solid Waste And Its Engineering Characteristics In Xi’an

With the development of economy and society,although the harmless treatment methods of urban domestic waste in my country are gradually increasing,in the future,for a long period of time,sanitary landfill will still be the main and indispensable method of urban domestic waste treatment.In this paper,from the perspective of geotechnical engineering,under the influence of different factors,the degradation characteristics and engineering characteristics of urban solid waste in the Guanzhong area of Shaanxi Province under the influence of different factors are studied.In this experiment,the proportion of urban domestic waste in Xi’an was selected.The samples of urban domestic waste were prepared manually,and the leachate characteristics and sample shear strength characteristics of the sample during the degradation process were measured at regular intervals.Relevant factors such as content,moisture content,degradation time and other factors analyzed and summarized the changes of the degradation and shear characteristics of municipal solid waste,and conducted a comparative study on the existing waste laboratory sample preparation methods.Through the investigation and analysis of the composition of urban domestic garbage in Xi’an,the content,moisture content,density and distribution characteristics of each component of urban household garbage in Xi’an are obtained.In the comparison test of urban solid waste sample preparation methods,direct shear test,compression test and degradation compression test were carried out on wet samples and dry samples respectively,and the test results and causes were analyzed in depth,and Suggestions and precautions for the selection of urban domestic garbage test sample preparation methods are given.By investigating and analyzing the composition of urban domestic waste in Xi’an,the content,moisture content,density and distribution characteristics of each component of urban domestic waste in Xi’an are obtained.In the comparative test of municipal solid waste sample preparation methods,direct shear test,compression test and degradation compression test were carried out on wet and dry samples respectively,and the test results and causes were analyzed in depth,and Suggestions and precautions for the selection of urban domestic garbage test sample preparation methods are given.Through the measurement of the leachate characteristics of urban domestic garbage samples with different variables in the range of 0-190 days,the law of the influence of different variables on the leachate characteristics of urban domestic garbage samples is obtained.In general,for urban household garbage samples with different combinations of variables,the trend of the p H,conductivity and salinity values of the sample leachate over time is basically the same.But for the samples under the influence of each univariate,the changes of the three characteristic values all show regularity with specific differences.The test results show that,in the landfill process of modern landfills,proper leachate recharge and increase of the vertical temperature control system can accelerate the degradation of urban domestic waste landfills and accelerate the stability of the landfills.Through direct shear tests on samples of different variable combinations,it is found that for the urban solid waste samples prepared in this paper,the cohesion decreases with the increase of degradation time,and the internal friction angle increases with the increase of degradation time.The trend,the slope of the fitted line of the sample’s cohesive force c and internal friction angle φ with time,generally shows a trend of increasing first and then decreasing with temperature.These rules can provide a certain data reference for the later maintenance,construction and reuse of Xi’an Sanitary Landfill.