The Numerical Simulation of the Size of Protective Coal Pillar under Railway

摘要

The mining under railway refers to the coal mining activities that must ensure the safety of railway transportation.When mining the coal seam below the rail,we must think about the surface subsidence caused by the mining which should be less than allowable railway deformation.When setting different protective coal pillar sizes in the process of coal seam mining,the sizes will have direct effect on the sizes of the surface subsidence.So,how to ensure the size of coal pillar is the key of mining under railway.Through the FLAC3D-software,we can ensure the influence of different width of coal pillar to the roof subsidence by analyzing the amount of subsidence.Through comparative analysis we concluded reasonable protective coal pillar width,so as to realize the safe railway operation and also achieve good economic benefits.