Research On Creep Characteristics Of MSW In Changan Landfill Of Chengdu

With the modernization process of accelerating,urban resident population increase and residents living standards improve,municipal solid waste(MSW)has increased dramatically,resulting surrounding environment pollution,ecological environmental protection level of decrease has been a serious threat to the physical and mental health of the residents in the surrounding life,this modern gradually increased for general geotechnical researchers and environmentalists attention problems.Insufficient amount of garbage and modern sanitary landfill in stark contrast,many are involved in landfill expansion and new model sanitary treatment facilities.This paper is located in Chengdu Longquanyi District Changan landfill field for research object,is adopted in the drilling sampling,combined the theory and laboratory test to geotechnical characteristics of landfill,and considering the time effect of deformation,study the characteristics of creep of the landfill body,for future landfill research to provide certain reference value,but also for the future landfill field rectification has certain reference significance.The work done in this paper is as follows:(1)Discusses the currently group on landfill at home and abroad features,basic geotechnical index,strength characteristics and creep features of research,after the landfill research provide guidance.(2)Compiling sampling scheme,to Chang'an landfill sealed field region were drilling sampling and will retrieve the soil like sealing sent to a laboratory for laboratory tests.Indoor experiments on landfill mass distribution,moisture content,density,soil particle proportion,void ratio and shear strength index is studied and with domestic and foreign research analogy,for the triaxial creep properties to lay the foundation for the study.(3)In the laboratory configuration suitable for soil samples in this experiment instrument size,TSZ-6A type strain control type of triaxial apparatus of 50 kPa and 100 KPA confining pressure triaxial compression test,drawing the main should stress-strain curve,measured two confining pressure under the ultimate stress,to study the different confining pressure triaxial creep tests provide important data.(4)In 50 kPa and 100 KPA confining pressure,axial consider step loading creep test,grading load according to the corresponding confining pressure under the ultimate stress determined,each level should step,according to the test results,and strain time curve by using the method of coordinate translation to sampling landfill time should stress-strain relationship.(5)According to the characteristic curve of creep deformation will be applied to the curves of the rheological elements are combined,on the basis of H-K series a Kelvin-Voige model extends the standard linear model,and integrating the creep equation.And according to the creep equation,combined with the creep curves using 1stOpt software of fitting nonlinear general global optimization algorithm for fitting.According to the fitting effect judgment extended applicability of standard linear body of sampling landfill,and according to the optimal fitting convergence feature value inversion of the model parameters.