Abstract:

Mining subsidence prediction is an indispensable part in the process of coal mining,in order to research the surface movement of railway line when mining the coal,and to solve the possible security risks in the process of actual mining,taking a coal mine as a prototype,using the FLAC3D numerical simulation software,by the rock initial value of rock mechanical parameters,applying two rounds of uniform experimental design,based on existing monitoring data of surface subsidence in mining area of the coal mine,and establish the numerical calculation model of mining area,then study and predict the railway line affected by mining on top of the working face.Using the same geological parameter model to research and analy the working face nearby under three different mining design schemes,which causess the influence degree to the new span railway bridge,and then to elect the best mining design scheme,which provide the powerful safeguard for the the security operation of railway line and the span railway bridge,and also provide a scientific basis for safe mining under railway bridge.

Key words: Keywords:mining subsidence prediction, numerical simulation, mechanical parameters, mining under span railway bridge