大采高膏体充填工作面回采初期涌水预测

Prediction on water flow in paste filling face with large mining height in initial mining

为了有效预测大采高膏体充填工作面回采初期充填区域涌水量情况,采用理论计算对工作面导水裂隙带高度进行经验计算,利用FLAC3D对膏体充填开采工作面的充填过程进行数值模拟,得出了上覆岩层运移而引起的导水裂隙带的分布特征。分析结果证明:导水裂隙带发育范围呈"工"字形波动,当工作面推进至115 m密实充填率为60%时,顶板导水裂隙带与含水层贯通,为后续工作面安全生产提供借鉴意义。

In order to effectively predict water inflow in filled area of the fully mechanized face with large mining height in initial mining,the theoretical calculation formula was applied to calculate the height of water flowing fractured zone in the fully mechanized face with large mining height. In combination with the field drilling data, No. 4 aquifer was possibly connected to water flowing fractured zone. At the same time, the FLAC3D software was applied to numerically simulate for the filling process of backfill mining face, and the distribution characteristics of water flowing fractured zone due to the overlying strata migration was obtained and analyzed, combining with field test data. The results showed that during the process of filling face advance the water flow fracture zone was arch shape. When the working face advanced to 115 m, the thick filling rate was 60%, and the roof water flowing fractured zone was connected with aquifer. So the thick filling rate would be no less than 70% in the process of industry advice. In combination with the field data, the accuracy of the prediction was confirmed. The paper provides reference for safe production of the subsequent face.