Mine pressure behavior law and hydraulic support suitability of high cutting coal mining face in shallow depth seam

摘要

In order to study the mine pressure behavior law and the hydraulic support suitability of high cutting coal mining face in the shallow depth seam, the KBJ-60Ⅲ-1 -type working resistance continued recorder of hydraulic support was applied to site measurement and analysis on the first coal mining face in Suancigou Colliery. The results showed that the first weighting interval of 52 m that occurred in the coal mining face was basically fit with the theoretical calculation results of 54.1 m; the periodic weighting interval would be increased with the mining face advancing speed increased, and when the coal mining face advancing speed reached at 4 m/d and 13 m/dthe periodical weighting interval would be 12.8 m and 21.8 m individually. During the pressurized period, the working resistance distribution features of the hydraulic supports would have high resistances at the middle part of the coal mining face and the rated working resistance ratio would be 96%; the working resistances of the hydraulic supports at the two ends would be low and not be over 91% of the rated working resistance ratio. Finally, based on the analysis of the operation features of the hydraulic support, the paper confirmed that the 2400/5000-2x4412-1750-type hydraulic support could meet the requirements of roof strata control during the pressurized period.