Study On The Structural Analysis And Treatment Measures Of Uneven Settlement Trough For Subway Station

The Xi'an subway is located in the loess stratum,and the change of groundwater level will cause the uneven settlement of the loess stratum,which will lead to the disease of the subway operation.The subway station is too large and uneven settlement will affect the integrity of the subway station structure,the safety of the joint and waterproof etc,serious uneven settlement and even the threat of the track,ride comfort and the safety of subway operation.In this paper,taking the San'Yao station of Xi 'an Metro Line 2 as an example,studied the uneven settlement,station under different thickness of roof and floor plan such as the main structure of the mechanical properties,and proposes the corresponding treatment measures,for subway station of uneven settlement processing scheme has important practical significance.The major conclusions of this study are following:(1)After different settlement scheme of analysis found that: when the station has the largest 0.25 m may be uneven settlement,the bottom beam longitudinal maximum tensile stress on the whole,not more than 1.5 MPa,the biggest bottom longitudinal tensile stress in general not more than 1.0 MPa,top beam longitudinal maximum tensile stress on the whole,not more than 2.5 MPa,roof longitudinal maximum tensile stress on the whole,not more than 2.0 MPa,can increase or increase the structure reinforcement and the section measures up to par.Analysis also found that very few parts in the 5-6 MPa tensile stress,the distribution in the station height is relatively high local inbound hall,reinforcement should be strengthened.(2)The bottom longitudinal beam,bottom plate,the maximum tensile stress of the roof beam,with uneven settlement increases with increase in the bottom beam and bottom longitudinal tensile stress increase is not significant,while the roof beam,longitudinal tensile stress increased significantly.It is suggested that the roof and top beam should be regarded as the key part of the reinforcement in the treatment measures.(3)Through the different uneven settlement of soil under the conditions of station structure stress analysis found that even if the station appears uneven settlement may be the biggest,the station did not appear under the soil vertical direction of the tensile stress zone,the station does not appear one vacant phenomenon.(4)According to the analysis results of the structure proposed to increase the anti deformation ability and reduce uneven settlement and strengthen land subsidence and groundwater monitoring and other measures to ensure the structural safety of the San'Yaostation.