祁东矿7_131工作面承压含水层下开采压架突水危险性预测

Risk Prediction of Support Crushing and Water Inrush During Mining Under Loaded Aquifer in Working Face 7_131 of Qidong Coal Mine

针对频繁发生的压架突水灾害问题,提出承压含水层下采煤压架突水危险性预测方法。首先结合含水层特征及载荷传递特性,确定承压含水层的载荷传递系数。其次利用关键层位置判别方法,判断回采区域内覆岩关键层结构类型,若覆岩为复合单一关键层结构,则工作面存在压架突水危险。该方法在祁东煤矿7131工作面的压架突水危险性预测中进行了运用,认为该面第II、III块段回采存在压架突水的危险,需提前采取防范措施。预测结果得到工程实践的验证。

According to the frequent disasters of support crushing and water inrush, it was proposed that the risk prediction method of support crushing and water inrush during mining under the loaded aquifer. Firstly, combined with the aquifer characters and the load transfer characteristics, the load transfer coefficient of the confined aquifer was determined. Secondly, the identification method of key stratum location was used to judge the structure type of overlying strata key stratum in mining area. If the overlying strata were the structure of composite single key stratum, there was the hazard of support crushing and water inrush in working face. This method had been applied in the risk prediction of support crushing and water inrush in working face 7131 of Qidong Coal Mine, it indicated that there was the hazard of support crushing and water inrush in Ⅱ and Ⅲ section of this working face, and it was need to take precautions in advance. The engineering practice had validated the prediction results.