Specially Thick Coal Seam Of Wudong Mining Area Fully Mechanized Coal And Rock Control Technology And Application

Horizontal section fully mechanized sub-level caving mining of deeply inclined thick coal seam is a safe and efficient mining method. The migration regularity of steeply inclined thick coal seam roof, caving and mining pressure appeared and horizontal seam, slowly inclined coal seam has a very big difference. Paper to shenhua energy co., LT,D., xinjiang Wudong mine 45° inclined roof as the research background,to carry out the roof dynamic defending and the regularity of dynamic disaster analysis, to strengthen the prevention and control, and local of the roof crack pressure relief has important scientific significance and engineering application value.Paper by collecting general situation of Wudong coal mine geological conditions, grasp the mine ground stress distribution, and understand the status of the calendar year mining.for 45° of Wudong north mining area of coal mine steeply inclined thick coal seam with horizontal section fully mechanized sub-level caving mining, the dynamic disasters of roof,using the theory of mathematical modeling analysis and Flac3D numerical simulation methods to understand and master the migration regularity of roof and caving characteristics: a. steeply inclined thick coal seam in overlying coal and rock movement influenced by mining and mining depth and coal seam dip Angle of working face has very big concern, with the deep development of exploration level, face increases the breaking of the top caving goaf, face on the top section under bending moment also increase; b. under the same premise, the dip Angle of coal seam, the greater the maximum height broken area rock roof height location closer to a and stope slope length L. When a>L, broken area maximum height near the top position in mined-out area; c. unlike horizontal seam, slowly inclined coal seam, steeply inclined thick coal seam roof caving method has four kinds: (1) rock along the direction of the bedding slip;(2) caving rock slide (or roll);(3) floor rock uplift;(4) orebodies extrusion (shear slip);d.coal face at the top of the arch structure is mainly for the support of stable near work of roof,hereinafter referred to as to stabilize the structure of the arch at the "bottom of the Angle ".As mining, arch stress concentration, the arch "at the bottom of the arch Angle extrusion destroyed easily, the unstability of the arch is easy. By mastering the migration regularity of roof, instability characteristics, engineering practices adopted in three different ways of unloading was carried out on the roof. As mining, arch structure stress concentration, the arch structure of "at the bottom of the arch Angle" is destroyed,the stability of the arch structure will be damaged. By mastering the migration regularity of roof, instability characteristics,engineering practice adopt three different ways to unloading of roof, respectively is: a. "on -the - under" trinity blasting roof; b. water softening and blasting coupling water injection treatment of roof; c. advance blasting treatment of roof and through the geological radar and drilling peep, microseismic monitoring, such as electromagnetic radiation monitoring means to ensure the safety of the roof caving. Three kinds of method combined with each other,complement each other, successful guarantee the safety of working face and tunnel, mine roof dynamic disasters are well controlled.This research for the horizontal section and power of full-mechanized caving mining face disaster forecast and control provides an effective method.