Research on Impact of Drainage on the Safety of Adjacent Railways
The impact on the adjacent railroad needs to be fully considered in the development process of a mine.The impact range of the depression cone formed by the drainage of development system and the impact of the depression cone on the ground surface and railways are analyzed.The influence radius of the depression cone is calculated using the Kusakin formula,and the surface subsidence displacement is obtained using the seepage analysis method.Based on this,FLAC3D is used to analyze the impact of the depression cone formed by drainage on the stability of the development roadway,ground surface,and the railways.The following conclusions have been drawn:the theoretically calculated maximum influence radius of the depression cone in the mining area is 1 323.14m,the mining area which is adjacent to the railway is within the range of the maximum depression cone and the surface subsidence near the railway line is 4.61 mm.The maximum values of pore water pressure decrease in the four horizontal development roadways of-270,-230,-170 m,and-120 m are 2.74,2.34,1.73 MPa,and 1.21 MPa respectively,and the maximum subsidence is 0.53,0.74,1.01 mm,and 1.15 mm respectively.The maximum surface subsidence caused by the depression cone is 1.62 mm,and the maximum subsidence of the railway line is 1.53 mm,both of which are far less than the permissible tilt i =3 mm/m of the displacement and deformation for Class I buildings and structures.Theoretical calculations and numerical simulation results show that the depression cone formed by the drainage of the development system in the mining area has no significant impact on the development roadways,ground surface,and the railways.
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