摘要
Abstract
In order to analyze the safety influence during the stoping period of No.9 coal seam in the 9109 working face on the roof overlying K5 limestone and No.3 coal seam goaf water accumulation in Xinzhuang Coal Industry,and to ensure the safe stoping of the working face,through summarizing the experience of different strata lithology columns and closed working faces,utilizing the"two zone"height theory formula,the height of the roof collapse zone is calculated to be 8.42 m,and the maximum heights of water conducting fissure zones are 32.23 m and 35.85 m.Collapse zone observation holes and water conducting fissure zone observation holes are constructed respectively in the adjacent 9111 working face return air roadway towards inside the goaf of the 9109 working face,and water conducting fissure zone contrast holes are constructed towards inside the 9111 working face,the method of using QKX-DSQ-1500 type double end water blocking device is adopted to inject water into the hole and pressurize it,the height of the"two zone"is actual measured.Through effect verification,the actual measured height range of the roof collapse zone of No.9 coal seam is 0-9.69 m,and the maximum development height of water conducting fissure zones is 32.12 m.The actual measured height is basically consistent with the theoretical calculation results,providing a basis for hole drilling design,and drainage is conducted on water-rich areas and aquifers of the working face roof.关键词
综采工作面/现场实测/垮落带/裂隙带/仰斜钻孔Key words
fully mechanized mining face/on-site actual measurement/collapse zone/fissure zone/inclined hole drilling分类
矿业与冶金
