| With the accelerated process of industrialization and urbanization in China,the ur ban domestic waste has increased dramatically.The rubbish not only pollutes the enviro nment,destroy the city landscape,but also spread disease threat to human health and life safety.Therefore,how to realize the urban living garbage reduction,resource and h armless,effective control of the pollution to the environment,realize the sustainable d evelopment of society,economy and environment,has become a major issue that need s to be solved urgently in the process of urbanization in China.The sanitary landfill m ethod does not need to carry on the pretreatment to the domestic garbage,at the same time can choose beaches,valleys,waste pits and depressions,ditches and other non cultivated land as a site,and landfill after several years later to be final cover,the ven ue can be for a variety of purposes,realize the land reuse,has become the first sche me for modern cities MSW disposal.But the construction of landfill general investment is large,some large landfill cost up to hundreds of millions of yuan.So how to reaso nable use capacity,fully understand the basic mechanical property of MSW and the re lationship of the stress and the strain becomes particularly important.In this paper,the basic geotechnical test and the three axis compression test are don e on the different depth waste soil samples and analyze its distribution law.The constituti ve relation of waste soil with different water content is derived in this paper.Finally,the following conclusions are drawn:(1)The natural density of landfill soil is between 0.6~1.4,the moisture content is abo ut 43.5%~83.6%.The specific gravity is 1.67~2.54,the maximum pore ratio is 4.39,the minimum is 1.45.The content of organic matter in the waste soil amounts to 43.13%,the content of the inorganic matter such as metal and ceramic is up to 28.91%,the content of kitchen residual is 24.44%,ash and slag is 21.39%.The reason is that the waste soil c ontains a lot of plastic,glass and metals,the void ratio and the dispersion of the waste s oil are larger than the average soil,and the distribution is not uniform,in addition to its o wn gravity compaction,but also by the biological degradation of garbage after the re arr angement of the impact,it caused the specific gravity,natural water content and so there i s a certain linear relationship,but also showed a greater dispersion.(2)In this paper,three kinds of solid waste soils with three different kinds of solid waste are consolidated and drained,and the cohesion and internal friction angle of the so il are obtained.Its numerical value increases with the increase of the depth of landfill,but the change is not very large.This is because with the increase of the depth of the soil,the biodegradation of the solid waste is more fully,and the density of the soil is higher,b ut the corresponding degradation can also produce the moisture and make the gas flow,a nd reduce the density of the garbage soil.(3)On the basis of Duncan Zhang hyperbolic function formula,by fitting the three a xis test data,the stress-strain relationship of different water content is derived,and the reli ability of the model was tested by Matlab software.It was found that the model simulated curve was in good agreement with the experimental curve.The rationality of the structur e is verified.This paper is of great significance to the study of landfill settlement and cap acity design. |
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