标题：SIMULATION RESEARCH ON THE SURROUNDING ROCK
STABILITY OF GOB SIDE ENTRY RETAINING WITH ROOF
CUTTING AND PRESSURE RELIEF BASED ON
ECOLOGICAL ENVIRONMENT OF COAL MINING
摘要：Although no pillar coal mining technology can improve coal production, roof instability and col- lapse will seriously affect underground personnelsafety and surface ecological environment. There- fore, the stability analysis model of surrounding rockin gob side entry retaining without coal pillar miningoperation with roof cutting and pressure reliefis con- structed, and its applicability is verified. The results show that the difference between the experimental results and simulation results of the maximum roof deformation is small, which are 10.96cm and 11.24cm, respectively. Based on the model, the in- fluence of roof cutting height and other parameters on the stability of roadway roof is analyzed. The re-sults show that the roof deformation will deteriorate with the increase of cutting height, but the cutting angle has little effect on it. In addition, the plastic yield area of roof decreases with the increase of cut-ting height. When the cutting height is 4.0m, the area of roof plastic yield area is 16.87m2, but when the cutting height is 10m, the area of roof plastic yield area decreases to 0.33m'. However, the plastic yield area of roof increases rapidly with the increase of cutting angle. The area of plastic yield area is16.87m2 when the cutting angle is 20 and 65.69m2 when the cutting angle is 809 , respectively. There- fore, in order to prevent uncontrollable collapse and deformation of roof during coal mining, it is sug- gested to design the height and angle of roof cutting as 6m and 40%, respectively.
关键词：Coal mining;Roof cutting and pressure relief;Gob side entry retaining;Coal seam mining;Surrounding rock sta-
bility;Roof cutting and seam cutting
