断层附近工作面底板突水评价研究

Evaluation and Research on Water Inrush from Working Face Floor near Fault

为了使突水系数法在煤矿底板突水评价中更加准确有效,考虑到采动影响下工作面底板与断层间的相互作用,建立断层上盘倾斜隔水关键层力学模型,并对其薄板模型的挠度进行求解。通过工作面底板实际破坏深度与断层上盘倾斜隔水关键层模型联合计算,得到断层附近工作面底板最易突水路径。在此基础上,提出断层附近突水系数法改进公式,并将其应用于某矿工作面底板突水评价中,结果表明:改进的突水系数法比传统突水系数法计算所得突水系数值高0.046 MPa/m,进而将工作面底板由突水较危险区评价为突水危险区。

In order to make the water inrush coefficient method more accurate and effective in the evaluation of mine floor water burst, a mechanical model expressing the hanging inclined water-resisting key strata was established by taking into account the interaction between the mine floor and the fault under the influence of mining, solution was carried out for the deflection of the sheet model. Based on the combined calculation of the actual failure depth of the working face floor and the model of the hanging inclined water-resisting key strata, the most vulnerable water-inrush path of the working face floor near the fault was found. On this basis, the improved formula of the water-inrush coefficient method was proposed and then used in the evaluation of the working face floor water inrush of a mine. The results indicated that the water-burst coefficient which was calculated by the improved water-inrush coefficient method was 0. 046 MPa/m higher than that calculated by the traditional water-inrush coefficient method, finally, the working face floor was evaluated from the more dangerous water-inrush area into the danger water-inrush one.