Deformation Analysis And Tunnel Reinforcement Measures Of Urban Double-line Mining Tunnel Construction

Due to the congestion of the ground traffic,the construction and operation of the urban subway was born.However,the excavation of subway tunnels will cross residential areas,which will influence the above-ground buildings and the surface.Controlling the deformation of the surface and buildings is the prerequisite for ensuring the safe use of the above-ground roads and buildings during the construction of the subway.Therefore,this paper has carried out related research on the deformation of the ground surface,buildings and tunnels caused by the underpass construction of the urban double-line mining tunnel:(1)According to the project example of the two-line mining tunnel crossing the shops around Fushan Elementary School in the 4th and 7th sections of Qingdao Metro Line 4,we can use the MIDAS GTS NX finite element analysis software establish a three-dimensional numerical model according to the relative position of the two-line tunnel and the building,geological data,,and then perform numerical analysis.(2)According to the numerical simulation results,we can analyze the deformation of the surface,buildings and tunnel support structure caused by the tunnel excavation process.The distribution of the surface settlement curve is similar to the Peck curve.The closer the horizontal distance to the center of the tunnel and the closer the longitudinal distance to the tunnel excavation surface,the greater the settlement value.The maximum settlement value is generated at the center of the double-line tunnel;the ground surface of the building gradually increases with the tunnel excavation large,but due to uneven settlement,the building has overall tilt,local tilt,distortion and other problems;due to the reaction force of the stratum against the tunnel,the vault settlement and bottom uplift of the tunnel cross-section support structures during the tunnel excavation process and deformations such as headroom convergence.In order to ensure construction safety and control the deformation of the three,pre-reinforcement measures are required for the tunnel.(3)We can use advanced small pipe reinforcement measures to conduct numerical analysis on the reinforced tunnel construction.Through analysis of lateral surface settlement before and after reinforcement surface settlement around buildings,building inclination,tunnel vault settlement and clearance convergence,etc.Verify the effectiveness of the advanced small catheter before and after reinforcement to control the deformation.(4)According to the comparison between the on-site monitoring deformation data and the simulation data,we can ensure that the deformation of the surface,buildings and tunnel supporting structure during the actual tunnel excavation does not exceed the limit,and confirm that the advance small pipe grouting reinforcement measures can effectively control the tunnel deformation caused by construction.Through the numerical simulation of the actual project,We can propose advanced small pipe reinforcement measures,and the effectiveness of its deformation control is verified based on the field monitoring data,which can provide a reference for similar projects.