| This thesis based on1410(1) coal seame of Huai Nan mining group Zhang ji mine. The integrated use of theoretical analysis, simulation, numerical simulation, field measurement method similar to the test face in the lift, the gob and long face under the condition of stope mine pressure appearance characteristics and control technology.The results show that:the recovery process in1410(1) Face roof fracture was the voussoir beam "structure; the face lengthened the overburden formed composite pressure arch span and height increases. Similar to the the analog measured and field measurement results show that the Face Pressure Showing below8coal goaf impact the general performance of pilot support pressure range of the largest cross-border recovery stage, followed by coal pillar side face kicking empty stoping stage recovery phase of minimum stress concentration factor. Obvious on the process of mining face in the overburden formation on with "structure, laboratory simulation mention face fractured zone growth height of42～47.5m in1410(1), caving zone growth height of14～16m; the maximum caving zone height is less than the remaining smallest waterproof coal pillar height of22m. Combined with on-site measured by numerical simulation the face different Bedrock thickness and the face length Face Roof displacement and stress changes bedrock thinner cycle pressure to step away from the smaller to greater compressive strength face the support pressure greater range.Comprehensive analysis of1410(1) during the mining face mine pressure behavior characteristics of the proposed surrounding rock control measures, and main pressure management during roof, roof and coal wall to take timely and effective control measures to strengthen the working face to face two Lane ahead of the distance of the support and strength of severe local deformation regions need to increase the density, intensity, and length of the supporting bolt and cable or injection on the roadway. Keeping the hydraulic support in a straight line and ensure the reasonable working face mining height is long, short work in the face of the key technology. |
