Study on the Occurrence Rule of Strata Behaviors of the Working Face in Gaojiapu Coal Mine
MA Ji;WANG Sheng;DENG Lei;Shaanxi Zhengtong Coal Industry Co.,Ltd.;College of Mining and Safety Engineering,Shandong University of Science and Technology;
Different mining methods were used in different mining stages of 101 working face in Gaojiapu Coal Mine. Based on the field monitoring of hydraulic support resistance of this working face and combined with the theory of mine pressure,this paper analyzed the occurrence rule of strata behaviors in 101 working face. The results showed that on the condition of fully mechanized mining,the thickness of immediate roof was 11.5 m,the average initial collapse interval was 24.7 m,the basic roof thickness was 9.9 m,and the pace of first weighting interval was 47. 0 m; on the condition of fully mechanized mining,the thickness of immediate roof was 17.9 m. The stope was pushed forward under the protection of the"rock-gangue"structure. The layer above the structure had no obvious influence on occurrence of mining pressure,there was no obvious period of pressure.It was indicated that the occurrence rule of strata behaviors in working face was not only related to the composition and structure of overburden,but also closely related to the coal mining method,especially the thickness of actual coal seam.