Analysis of the structure and movment of the overlying strata in the large mining height and thick coal seam

Overlying strata structure and movement characteristics influenced by the working face mining space play an important role in the strata behavior of workface.Based on the problem that overlying strata structure and movement characteristics influenced by mining height in 2-106 fully-mechanized working face with large mining height,overlying strata structure and movement characteristics of different mining heights were studied with the method combined numerical calculation with field measurement.Laws of overlying strata movement characteristics,height of caving zone and separation value changing with different mining heights were obtained.The results show that:as with the mining height increasing,the overlying strata movement is more intense,mining influence range increases,height of caving zone nonlinear rises,tendency of coal wall spalling increases,fractured zone height and maximum of separation value also increases.The research results have been verified in the field test