疏干排水对临近铁路安全性影响研究

Research on Impact of Drainage on the Safety of Adjacent Railways

某矿开拓过程中需充分考虑对临近铁路的影响,分别从开拓系统疏干形成的降水漏斗影响范围及对地表和铁路的影响进行分析,通过库萨金公式计算降水漏斗影响半径,同时利用渗流分析法求解地表下沉位移,在此基础上利用FLAC3D分析疏干排水形成的降水漏斗对开拓巷道、地表及铁路稳定性的影响。得到如下结论:理论计算的矿区最大降水漏斗影响半径为1323.14 m,矿区临近铁路均在最大降水漏斗范围内,铁路线附近地表沉降为4.61 mm;-270、-230、-170 m和-120 m四个水平开拓巷道的孔隙水压下降最大值分别为2.74、2.34、1.73 MPa和1.21 MPa,最大沉降分别为0.53、0.74、1.01 mm和1.15 mm;降水漏斗引起地表最大沉降为1.62 mm,铁路干线上最大沉降为1.53 mm,均远小于Ⅰ级建、构筑物位移与变形的允许倾斜i=3 mm/m。理论计算和数值模拟结果表明,矿区开拓系统疏干排水形成的降水漏斗对开拓巷道、地表和铁路均无显著的影响。

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 1323.14 m,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.