Research on methods of mining width determination in deep trip pillar mining

Abstract：The pillar mining is usually used in the mining under buildings to control extent of the surface movement and deformation.With the increasing depth of mining exploitation, it's apt to reach the super-subcritical exploitation which can cause the insufficient working face.The pillar mining forms super-subcritical exploitation face.By integrating a pillar mining experiment which operates on one coal mine under the building, with the investigation and exploration of the methods of determination mining width in deep strip pillar mining, and comparing the submersion coefficient method and the pressure arches the predicted value method, the strip pillar mining parameter of the coal mine is obtained.The experiment result indicates that it is extremely effective for determination mining width deep strip pillar mining, and it can control the surface movement and deformation sufficiently.The method is valuable to guide the exploitation of the abundant mine under buildings or the similar geological condition.

Keyword：deep strip pillar mining;super-subcritical exploitation;mining degree;surface distortion;