Study on Micro Seismic Monitoring and Measuring Technology in High Cutting Fully Mechanized Top Coal Caving Mining of Deep Mine

Based on the application of the micro seismic monitoring and measuring technology to the coal mining face,the monitoring and measuring technology was applied to the study on the overburden strata movement law and the mining support pressure distribution law of the fully mechanized top coal caving mining face in deep mine with thick overburden.In combination with the monitoring and measuring parameters,the basis could be provided to determine the working resistance of the powered support in the coal mining face.The study results showed that periodical weighting step distance of the coal mining face was 21.6-25.4 m and the average was 23.4 m.The weighting step distance of the high level roof was 56.3-62.3 m,the average was 59.3 m and the max broken height was 70 m.The thickness of the seam immediate roof and the thickness of the base roof and high level roof were 30,20 and 20 m individually.The influence scope of the strike abutment pressure in the coal mining face was 42.7-54.2 m and the average was 48.6 m.The peak location of the abutment pressure was determined and could provide the theoretical basis to determine the advance support distance during the mining process in the mine.According to the mine strata pressure parameters obtained with the micro seismic monitoring and measuring technology,the rational working resistance of the powered support was determined as 15 000 kN.