| In urban environment with complex traffic,it is difficult to use the open-cut method or top-down method in a subway station construction. Therefore the shallow tunneling method is widely used because of the higher construction security and little influence on traffic.Restricted by station spacing,Qingdao dunhua subway station has deep cover.However, the station bury in slightly weathered granite and the geological conditions is good.In order to highlight the characteristics of Qingdao, dunhua station is design to be a pillar type station.Pillar type station is rare in our country, the related theoretical research is few, the construction experience is defective.Besides the mechanical transformation mechanism is complicated. So it is necessary to study the stability of surrounding rock and the mechanical transformation mechanism in the construction of dunhua pillar type station.Baced on dunhua station of Qingdao metro,this paper carried out the study of the pillar type subway station with two-dimensional,three-dimensional numerical simulation and site monitor measuration for the main construction of the subway stations, three-dimensional numerical simulation for the construction of metro connected passage-way, the main research work is as follows:(1) the law of surrounding rock deterioration with strength reduction are studied by the method of strength reduction with numerical simulation.(2) the mechanical transformation mechanism and strata deformation characteristics of the main construction of the subway stations with different construction schemes are studied by two-dimensional and three-dimensional numerical simulation.(3) the stress and displacement of the main structure affected by the construction of metro connected passage-way are studied by three-dimensional numerical simulation.(4) the monitoring data analysis and the numerical simulation results are basically identical after contrastive analysis the monitoring data with the numerical simulation data. |
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