Research And Control Of Surrounding Rock Stability For Fully Mechanized Top Coal Caving Face Two Roadway In JiuDao-ling Coal Mine

With the shallow resources reserves dwindling, mining depth increase greatly in coal mine, geological conditions of increasingly complex, increasingly high stress, high stress environment, in the superficial performance for the hard rock characteristics of strata as well as characteristics of soft rock roadway surrounding rock deformation, long more than. In the mining process, due to some reasons, the roadway has to be arranged in loose and soft surrounding rock, soft rock has low strength, structural surface development, and the flow characteristic of severe swelling deformation.According to the study on Jiudaoling Mine, the -850 fully mechanized top coal caving face two lane is arranged in the deep coal roadway 1000m, the average thickness of coal seam is 10m, because of the high stress and other reasons, during working face mining roadway floor heave obviously, serious damage, and appeared large area roof fall accident, seriously affected the normal production of working face. Aimed at the practical problems of this mine, based on the economic, efficient, safe principle, understanding of the geological data and the coal rock mechanics parameters by field investigation, in-situ stress test to understand the relationship between the main stress and roadway, understanding the type of surrounding rock by loose circle testing, and determine the support theory and support mode.Using the combined arch theory to determine the roadway section is a semicircle arch, supporting "bolt-Cable-metal-steel ladder and let pressure tray" composite support; two road way parameters are determined through theoretical calculation, designing two sets of supporting schemes, and proving the mine selection the scheme is feasible by using FLAC numerical simulation software. The 100m industrial test of fully mechanized top coal caving face two roadway support scheme, the test of roadway surrounding rock pressure and rock roof deformation, according to the observation data to test the feasibility of a protection scheme, the final design for the mine fully mechanized caving face two roadway support scheme, to solve the problem fully mechanized top coal caving face two roadway support...