Analysis and measured of strata behavior law and mechanism of 8.8 m ultra- high mining height working face
YANG Junzhe，LIU Qianjin
針對淺埋深超大采高工作面礦壓顯現強烈的問題，基于支架壓力現場監測，對上灣煤礦8.8 m超大采高工作面礦壓顯現規律進行了研究。結果表明：8.8 m超大采高工作面基本頂初次來壓步距為45 m左右，周期來壓步距平均為13.5 m，動載系數平均為1.6；超大采高工作面周期來壓具有來壓步距短、來壓持續時間長、來壓區域性明顯、動載礦壓強烈等特點。根據工作面上覆頂板結構分析認為，工作面開采強度大、頂板活動劇烈，關鍵層結構單一、賦存層位低、易滑落失穩、上覆頂板整體性破斷，是造成淺埋深超大采高工作面礦壓顯現強烈的主要原因。
In view of the problem of strong strata behavior appearing at ultra-high mining height working face in shallow buried depth,based on the on-site monitoring of support pressure,the law of ground pressure at 8.8 m ultra high mining height face in Shangwan coal mine was studied.The results show that the first weighting step of the main roof in 8.8 m ultra-high mining face is 45 m,while the average step distance of periodic weighting cycle is 13.5 m.The average dynamic load coefficient is 1.6.Cyclic weighting in super high mining face has the characteristics of short weighting steps,long duration of pressure,obvious regional weighting and strong dynamic rock pressure and so on.According to the analysis of the overlying roof structure on the working face,it is concluded that the main reasons for the strong ground pressure in the working face with shallow buried depth and super high mining height are as follows:the high mining strength of the working face,intense roof activity,single key layer structure,low occurrence horizon,easy slipping and instability and integral breakage of overlying roof.
Shendong mining area;8.8 m ultra-high mining height;fully-mechanized mining with ultra mining height;mine presseure law;shallow buried depth