Study on Mine Strata Pressure Law of Fully Mechanized High Cutting Coal Mining Face Under Thick Unconsolidated Overburden Strata

In order to study the mine strata pressure law and the powered support selection rationality when the mining was in a seam of Carboniferous-Permian C oal Series with thick unconsolidated overburden strata, a YHY60 (B) mine intrinsic safe digital pressure gage was applied to the site measurement on the working resist ances of the powered supports in No.10101 coal mining face in Ciyaogou Mine.The results showed the initial roof weighting distance of the coal mining face was 56.5 m, the dynamic coefficients of the initial roof weighting and the periodical roof weighting in the coal mining face were 1 .33 and 1.23 individually and dynamic pressure of the periodic roof weighting was obvious.During the roof weighting period, the loading on the powered support along the coal mining face would be high in the middle of t he coal mining face and be low at the two ends of the coal mining face.The rock lined beam theoretical calculation and the site measured statistic were applied to calcul ate the rational working resistances with 7 346 kN and 7 057 kN individually of the powered supports required for No.10101 coal mining face.The results showed that Z Y8000/24/50D mode powered support was good in suitability.