Deformation Calculation And Numerical Simulation Research On Simple Supported Bridges In Mining Area

Bridge structures are widely distributed in the whole country.Along with the exploitation of coal resources,the large deformation of the surface of the mining area has great influence on the highway and railway bridge in the mining area.When the deformation of the ground surface reaches or even exceeds the maximum allowable deformation of the bridge,the bridge will fall and fall,which will seriously affect the safe operation of road traffic.In this paper,the bridge of West Ring Highway in the mining area of the BaoAn village,city YangQuanin ShanXi province is studied.Through the theoretical analysis of the goaf upper surface deformation dynamic main influencing factors on the structural stability of bridge,and by means of numerical simulation to simulate the relationship between the pier and the ground deformation.On this basis,according to the actual data of the project,the deformation and failure of the bridge at different positions of the working face are calculated.In this paper,the following results are obtained:(1)The theoretical analysis shows that the simply supported beam bridges in the goaf are mainly affected by uneven settlement,inclination and horizontal movement of piers;In the mining area,the pier is mainly affected by the ground tilt,and the slopevalue is less than the ground tilt.(2)The linear relationship between moving deformation and surface deformation of simply supported beam bridge is obtained.(3)According to the bridge work in different mining face layout under the condition of deformation comparison: the bridge is located in the goaf subsidence and the vertical boundary and the inflection point when the bridge slope with bridge to the maximum;and the corresponding boundary angle decreases,the bridge tilt decreased gradually;on the surface horizontal movement of extreme position,the bridge deck and pile foundation of the occurrence of relative slip the effect of bridge safety.Based on the above research results,it is important to guide the mining area to rationally plan the mining scheme,to reinforce the bridge reasonably and effectively,and to ensure the safe operation of the road traffic.