Study On Mining Technology Of Fully Mechanized Top Coal Caving Mining In Changan Coal Mine

Changan coal mining has the characteristics of large mining height and shallow depth. In the process of mining of 4113 coal face threatened by surface water Shao Jia Wan Gou.In this paper, the mine surface water characteristics and hydrogeological characteristics, coal seam conditions as the research background, the Changan coal mine 4113 coal face in as the research object, research on coal mining technology in the full-mechanized top-coal caving mining technology, overlying strata movement and deformation characteristics, determine the water conductive fissure belt height, "two belts" growth forecast and the water inflow and safe mining scheme.In the course of the study by analysis of the hydrogeological conditions, clear each containing (separated) layer of the nature and effect of the size; by similar material simulation and numerical simulation methods, analyzes the working surface of overlying strata failure process and the scope of application engineering analogy, in similar mining conditions of hydraulic fracture height.The results show that, in Shao Jia Wan Gou River, the safety of fully mechanized top coal caving mining method can limit mining height of 4113 coal face. The mining height is below 8m (recovery rate 85%) is the water flowing fractured zone can not be switched on Shao Jia Wan River, adopt comprehensive prevention and control measures of water after mining is safe and feasible.