Study on the Impact of Surface Deformation on Bridges in the Mining Area Based on Numerical Simulation Method
This paper takes the Erlongshan No.1 viaduct as the research background to study the surface settlement caused by the existing quarrying hollow area and the effect of settlement on the proposed bridge.Combined with numerical simulation analysis,this paper formulates the surface settlement pattern and the effect of surface settlement on the proposed bridge under the action of self-weight and additional bridge loads for different hollow areas(hollow area radii,hollow area cavity heights,hollow area roof depths,and roof elastic modulus).The results show that:the maximum value of surface settlement is positively correlated with the size of the radius of the extraction zone and the height of the cavity of the extraction zone,and the maximum value of surface settlement is negatively correlated with the depth of the top plate of the extraction zone and the modulus of elasticity of the top plate;in combination with the requirement of the maximum settlement of the adjacent piers,the bridge will be built in the actual project with the following results:the maximum settlement of the bridge is the same as the maximum settlement of the bridge.Combined with the requirements of the maximum settlement difference of adjacent piers,under certain conditions in actual engineering,the radius of the goaf is less than 60 m,the buried depth of the goaf is greater than 55 m,the height of the goaf cavity is less than 1 m,and the elastic modulus of the rock formation directly below the bridge is greater than 2 000 MPa,which can theoretically not be treated.The smaller the radius of the goaf,the larger the buried depth of the roof,the smaller the height of the cavity,the greater the elastic modulus of the roof rock layer,and the smaller the surface deformation of the goaf,the smaller the impact on the built bridge.
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