Mining technology of ultra thick seam under 380 k V high voltage line in Pingshuo Mining Area

in oder to realize a safety mining of No.4106 and other coal mining faces in a ulra thick seam of Ta ki Block of ingshuo No.1Underground Mine underthe high voliage line with the theoretical analysis and the ste measurement combined method a stuty with the nclined deformation of the high-voltage transmission line-tower as the control index set up the mining plan of the coal mining face and provided te line-ower maintenance pan to resist the surace ground dynanic defomatin.The site measured data of the suface ground.tower foundation and tower inclined defomation were obtained. The datastudly showed thatinthe thicknesslimied mining plan( only mining and no top coal caving) with smal oa pllar under the lin-tower the final deformaton of the surace ground at the line-tower would be controletwithin the allowed scope and the reconstouction plan of the line-tower foundation reduced the surace ground dynami deformation affected to the line-tower.The measured inclined defomation ofthe tower surace ground was ild to the early predictedresuts.The whole plan was safety and rational and solved the contradiction between the tower safety operation and the resoucesrecovery The development of the inelined deformation in the surace ground.tower foundatio and tower woult have "synchrony and different value features. Underthe infuence of the underground mining.the suface deformaion would calse a synchronous deformation ofthelne-ower foundation and the tower. The inclined deformation of the above would have relationship with sequence from high to lower.