The Study On Rockburst And Prevention By Water Injection In Steep Coal Seam Of Datai Coal Mine

It is a new topic that rockburst prevention in steep coal seam by water injection. Based on the study of rockburst prevention in steep coal seam by water injection of Datai coal mine, the following work are done:In theory, the rockburst are classified as coal mass compression rockburst, roof crack rockburst and faulting rockburst according to the difference of main body of rockburst initiation. The features and types of rockburst of Datai coal mine are analyzed according to the situation of rockburst in Datai coal mine and coal seam, rock property of roof and floor, the fault of geology structure and some factors that influence rockburst.In mechanism, the analysis of coal seam softening and the mechanical property change of coal by water injection is made. The mechanism analysis is verified through the site data of Longfeng coal mine, permeability of coal sample in laboratory, compression strength of different water ratio and different damage situation.On site, the equipment selection and scheme design of water injection are made. The two cases of water injection are analyzed and generalized, then the reasons of various states are presented. This results supply the foundation for water injection further more.