Dingji Coal Mine 1272 (3) Of Stope Surrounding Rock Movement And The Study On Strata Behavior Regularity Of The Working Face With Large Mining Height

Thick seam of more resources and high cutting fully mechanized mining technology has become the main stage thick seam mining methods; use of fully mechanized mining technology at mining stope wall rock movement appears and general mining height of surrounding rock movement in different situations; to control the surrounding rock sporting large mining height, this thesis Dingji mine 1272 (3) large Working as research background, theoretical analysis, numerical simulation FLAC3D, field measurement, analysis of large mining height behavior law and country rock movement characteristics for similar mining conditions provide practical guidance theory, engineering practice has a certain value.Aiming Dingji 1272 (3) of fully mechanized mining face geological conditions, theoretical analysis of fully mechanized coal face overlying strata movement law of development, in the process of mining stope longitudinal and lateral movement of features, analysis and stope wall rock abutment pressure distribution and the impact of surrounding rock movement, so as to equip large mining height substantially surrounding rock movement forms and laws of deeper study large mining height of surrounding rock foundation movement.By FLAC3D software to simulate different mining height, respectively, and the different effects of different length Face advancing speed of the stope underground pressure. Through comparative analysis of different mining height, stope wall rock working face length and the speed of advancement of the stress field, displacement field and plastic zone of face roadway deformation. Combined with the small set of 1272 (3) of fully mechanized mining face Comparative analysis of the actual situation of mining stope underground pressure behavior law.The numerical simulation results with real face in the field combined with analysis supports in force, the distribution of the working resistance, loop resistance; weighting calculated by theoretical analysis Face stride and step away from the old roof pressure, compared with field measurement found broadly in line with the actual theoretical...