Distribution Laws of Abutment Pressure in Coal Pillar for Light Type Top-Coal Caving Face under Dynamic Pressure and its Engineering Application

摘要

Under the dynamic pressure, ground pressure accidents of rib saplings roof fall and floor heave in coal pillar of light type top-coal caving face have often happened. In this paper, based on the geological conditions of a coal caving face in a coal mine, FLAC3D is used to analyse the stress distribution laws, in which the position of peak value and distribution laws of abutment pressure on both strike and slope in coal pillar of gateway are obtained, the conclusion will provide a theoretical basis for parameters designing of coal pillar and pre-support in light type top-coal caving face under dynamic pressure, and it will also provide some available references for other similar mining areas. While the parameters designing of pre-support are used in practice, the effects meet the requirements of engineering applications.