Technology Of Shuguang Mine 1226 Transport Lane Blasting Cutting Top Along The Empty Stay Lane

As the basic resource for energy development and application,coal has an irreplaceable strategic position in China and the international community.However,with the large-scale exploitation of shallow coal resources,coal resources are gradually transferred to the deep,increasing the depth of mining,resource shortage,difficult to control the pressure and other issues will gradually emerge,the urgent need for a new process to achieve high-yield and efficient mining.The technology of roof cutting and pressure relief without coal pillar self-contained roadway abandons the previous section coal pillar or the use of roadside filling body to isolate stress transfer and support roadway retention.The technology saves a lot of coal resources to a certain extent and reduces the amount of roadway excavation,which has high research value for the mining prospect of coal resources in mines.In order to enhance the universality of non-pillar retaining technology for roof cutting pressure relief,the theoretical research on roof cutting pressure relief is deepened.In this paper,taking 1226 transport roadway in Shuguang Coal Mine as an example,the roof cutting pressure relief parameters and strata behavior law of 1226 transport roadway in Shuguang Coal Mine under the condition of composite hard roof are studied.results showed:When the direct roof crushed gangue is not under pressure,the main roof of the roadway is simply regarded as a short cantilever beam structure.Through theoretical analysis and calculation,the optimal roof cutting angle is 15°and the roof cutting height is 7.5 m.Through numerical simulation,the mine pressure behavior of roadway under idfferent cutting angle and cutting height is verified.When the cutting height is 7.5 m and the cutting angle is 15°,the effect is the best,which is basically consistent with the theoretical calculation.Through the observation of field measured data,under the condition of roof cutting height 7.5 m and roof cutting angle,roadway support is mainly divided into advanced support area(30?50m ahead of working face),temporary support area behind frame(0?200 m behind working face)and stable area(200m behind working face).By using use of monitoring methods such as roadway surface displacement,anchor cable and stress of single hydraulic prop in roadway,it can be seen that after roof cutting and pressure relief,the surrounding rock pressure and roof subsidence are significantly reduced.After thestability of gob-side entry retaining roadway,the displacement of roof and floor is about 300 mm.This paper not only solves the problems of slow driving speed,high driving cost and tight replacement in Shuguang Mine,but also makes some contributions to the use of other similar conditions and the popularization of the technology of cutting roof without coal pillar.