Rainfall Of A Valley-type Landfill Deformation Stability Analysis

In recent years,living garbage production is growing at a rapid pace in China,The landfill is the main treatment of municipal solid waste,But the structure of the landfill,composition and properties of municipal solid waste,reservoir environments are more complex,Therefore,the rational analysis of the physical and mechanical properties of municipal solid waste and accurate evaluation of stability of the landfill are effective and comprehensive treatments of municipal waste in the key.This paper considers the practical problems,and studys the stability of the landfill with rainfall and the failure landfill closure system.Firstly,according to articles and information about the test of MSW strength and stability of the landfill,and combining with the actual landfill,the paper stratified the landfill.Second,according to the region’s municipal solid waste composition table and physical properties of soil layers garbage,The paper prepare three different void ratio specimen and make triaxial shear test to get a sample deformation and strength parameters.On the basis of the test results,the paper establish landfill geological model and analysis of the stability of the landfill rainfall.Moreover,according to the research results,the paper summarizes the lead platoon system failure causes and appropriate treatment measures,and providies a reference for the protection of the safety of landfill.In this paper,the research results as follows:(1)By reading other articles,the paper statistics garbage soil characteristics in different regions of our country and understand the characteristics of different regions of garbage soil.(2)According to the garbage soil composition and density,the paper prepares soil samples that the void ratio is 3.0,2.5 and 2.0 respectively,In order to reflect the different ages and the depth of the MSW physical characteristics.By triaxial shear test can be found,Garbage soil cohesion between 14～17KPa,internal friction angle between 24～35°.Combined with domestic and foreign research results and current situation,the test results have a certain rationality.(3)Under different rainfall conditions,the paper,using elastic-plastic model,analysis the three-dimensional stress and displacement fields of the garbage dam and refuse dum;Also the paper calculate the stability of the waste mass slope,and analysis the sliding stability of the garbage dam in different conditions,obtaining relationship with landfill stability and rainfall intensity and timing.(4)Under rainfall conditions,garbage dam stability is mainly affected by dam upstream slope seepage system.When the garbage dam upstream slope seepage system is intact,rainfall on the slope of garbage downstream of the dam slope stability influence is weak,When the garbage dam upstream slope seepage system damages,rainfall on the slope garbage downstream of the dam slope stability influence.(5)In view of the high level of landfill leachate,drainage system failure,and clogging in serious condition,the paper proposes measures aiming to prevent leachate discharge tube blockage and make it smooth,and further elaborate emergency measures in case of heavy rainfall,providing reference for the safe and stable operation of the landfill.