| 1242(3) face being influenced by many mining faces during coal mining operation was analyzed in Gubei Coal Mine Of Huaizhe Coal & Electric Co. Ltd.The association method of actual measurement, theoretical analysis and numerical simulation was used to analyse and research ground behaviour face, surrouding rock destruction reasons and controling techniques. The thesis firstly reviewed and analyzed distribution area of face support resistance,was analyzed step distance of working face pressure,abutment pressure distribution of roadway, the relation between supports and surrounding strata and adaptability of support. Secondly using numerical simulation, analysis was made on under the conditions of both the sole mining and many mining faces, comparing with The working face of vertical displacement,displacement and height. The results showed of the three quantities the latter is better than the former remarkably. In mining process being caused surrounding rock fragmentation, wall caving and roof fall. In addition,based on using multiple mechanical model researched on characteristic of support load during the periodic pressure of working face, roof fall mechanism, the influence circle of abutment pressure affecting factors, estimates the reasonable depth of the working coal face wall caving. In conclusion, It is conclude that surrounding strata destruction mechnism as well as their influence factors were ana-lyzed in 1242 (3) face and proposed on some the corresponding modification measures, can offer scientific evidence and technique guide fort he Mine safety, and also for simila rcoal seam accumulated some actual experiences. Figure 78 table 14 references 55... |
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