摘要
为了研究近距离煤层采空区下回采巷道在回采期间矿压显现规律,对回采工作面巷道围岩结构、围岩变形和松动圈大小进行了现场监测。通过监测结果分析得出,煤柱帮主要由煤和少量泥岩组成,裂隙发育,破碎严重。顺槽两帮最大移近量为0.49 m,顶底板最大移近量为0.41 m。未受采动超前支承应力的影响前巷道松动圈最大为1.3 m,受影响后增加至2.2 m,工作面超前支承压力影响范围为30m。
In order to study the mine pressure behave law of roadway under gob in closer distance coal seam,we made a site monitoring on gateway of coal mining face in this paper,including the structure,the deformation variables and the size of loose circle in surrounding rock.By analyzing the monitoring results,we drew a conclusion that the composition of surrounding rock was coal in a great deal and little mudstone,which were seriously broken;the largest sidewall convergence was 0.49 m,the largest floor convergence was 0.41 m.Before the influence of lead abutment pressure,the maximum loose circle was1.3m,and it increased to 2.2m after affected,the influenced range of lead abutment pressure was 30m
出处
《煤炭技术》
CAS
北大核心
2014年第4期109-112,共4页
Coal Technology
关键词
近距离煤层
采空区下
围岩变形
松动圈
支承压力
closer distance coal seam
gob
surrounding rock deformation
loose circle
abutment pressure
