Research On Soil Deformation Of Mining Subway Tunnel And Its Construction Optimization

It is Predicted that a great deal of urban metro engineering will be constructed atearly-middle period in the 21st century based on flourish metro engineeringforeground nowadays,and at one time many geotechnical problems will also comeforth Large land subsidence value induced by metro tunneling can lead to that roadsurt'ace,buried pipelines and buildings and SO on．dre damaged Furthermore,badeconomic loss and social effect can be brought about As a result,it is an urgentrealistic problem that land subsidence induced by urban underground engineering isforecasted and controlled SO as to ensure the safety of close-by building and buriedpipelineIn this paper,the finite element software MIDAS-GTS is performed to simulateconstruction process,and the shallow-tunnel characters and settlement of groundsurt'ace are studied,different influencing factors are discussed All this providesevidence to the tunnel constructionRelying on the monitoring project of the ground subsidence of Mining Tunnelconstruction district of Shahe Station of Guangzhou Metro Line VI,this paper studiedthe rules ofthe ground subsidence caused by construction ofurban tunnels which usemining tunnel construction method Main researching work is as follows:(1)The ground subsidence theories on tunnel excavation were summarized；though summarizing the form and mechanical effects of support usually used forunderground engineering,the common simulation methods of support will besummarized(2)Some two-dimensional model of mining tunnels are established by thenumerical analysis software-MIDAS-GTS,and the paper studies the mining tunnelcharacters form different t'actors,which focuses on the overlying soil thickness,thenature of rock,the supporting measures,the excavation diameter and excavation wayThe surface subsidence,the vault settlement,the cave convergence and the domeuplift are analyzed in this paper(3)The measurement data of the mining tunnel of Shahe Station are analyzedand summarized,and obtained the rule ofsoil deformation (4)The mining tunnel of the Shahe Station of Guangzhou Metro Line VI isanalyzed and compared The conclusion show-s that the laws ofreseaxch and measuredresults are basically identical So,this provides the basis for the design andconstruction of the similar projects in Guangzhu,and to optimize the constructionscheme...