工作面过软煤带顶板控制研究

Research on Roof Control of Working Face Passing through Soft Coal Zone

介绍了寺河矿西井区W2302(中段)工作面分布有逆断层、正断层、陷落柱、薄煤区、软煤区等对生产影响较大的构造,特别是软煤区顶板极易垮落,出现漏冒型冒顶,给工作面推进造成了极大的困难。采取留底煤等方法后,工作面的顶板管理难度明显降低,顶板事故明显减少,工作面的推进速度明显加快,由原来的每天平均2刀加快到每天平均7刀。工作面的周期来压步距明显加长,顶板压力显现明显变弱,工作面2.5 m厚的砂质及碳质泥岩也都能养护住,没有出现垮落现象。

This paper introduced the structures of W2302(middle section)working face in the west mine area of Sihe Coal Mine,which had great influence on production,such as reverse fault,normal fault,collapse column,thin coal area,soft coal area,espe-cially in soft coal area,the roof was easy to collapse,and leakage type roof fall occured,making it very difficult to push the working face forward.After adopting the method of keeping bottom coal,the difficulty of roof management in the working face was obviously reduced,roof accidents were obviously reduced,and the advancing speed of the working face was obviously accelerated,from the original average of 2 knives per day to the average of 7 knives per day.The periodic weighting step distance of the working face was obviously longer,the roof pressure was obviously weakened,and the 2.5 m thick sandy and carbonaceous mud-stone of the working face could also be maintained without collapse.