Stability Of Surrounding Rock In Large Inclined And Medium Thick Coal Seam With Broken Roof When Blasting Mining Technology Transfers To Fully Mechanized Mining Technology

Because of its unique rock formations, the large inclined coal seam has its own special variation of the rock strata which is different from the gently inclined coal seam. The large inclined coal seam with broken roof has a better rock joint development, poor overall strength, low steady ability and it needs more rock support. At present some certain theories and experiment researches relevant to mining technology, roadway surrounding rock control, movement law of overlying strata and strata pressure behavior of deeply inclined coal seam mining are conducted in China and abundant experience is obtained. However, the researches of blasting mining technology transfers to fully mechanized mining technology with large inclined and medium thick coal seam which has broken roof are relatively less. Thus, it is of great theoretic importance and has engineering application value to study this project.Based on the 1811 face of broken roof of Tangjiahe mine with large inclined angle and medium-thickness seam, theoretical analysis, numerical simulation and field measured data are applied in the paper to analyze the characteristics of three processes in the transformation of blasting mining technology to fully mechanized mining technology of broken roof with large inclined angle and medium-thickness seam, including surrounding rock stress state of open-off cut, support requests and technical approaches. The main research findings are as follows:①Based on the deep understand of the geological survey of 1811 face, the mechanics theoretical analysis of the surround rock stability of the open-off cut in the transformation of blasting mining technology to fully mechanized mining technology, and calculation of support density in different ways, the paper find the best technical plan in the transformation of blasting mining technology to fully mechanized mining technology.②According to the application of numerical simulation, simulating the surrounding rock stability of three processes in the transformation of blasting mining technology to fully mechanized mining technology, and verifying the feasibility of the technical plan.③ The field-test got the data of the pillar rock pressure values and roof displacement in 13 measuring points,then compared with the result of numerical simulation. Thereby we got the situation of the surrounding rock stability of three processes in the transformation of blasting mining technology to fully mechanized mining technology and verified the feasibility of the technical plan in field-test.