大采高综采工作面支承压力分布模拟研究

Numerical Simulation Study on the Abutment Pressure Distribution in Fully Mechanized Working Face of Large Height Mining

针对大采高回采工作面矿压显现严重的问题,利用现场数值模拟手段,分析研究大采高工作面支承压力分布的特点。结果表明,工作面支承压力影响范围随采高加大而增加,支承压力峰值随着采高的加大逐渐向工作面前方移动,超过峰值点后都呈单调下降趋势。工作面推进速度与工作面支承压力的显现规律呈相反关系,即推进速度快,矿压显现不明显,推进速度慢,矿压显现相对明显。采高加大,垮落带范围增大,断裂带的高度升高。

Aiming at of the serious problems of stress problems on large-mining-height fully working face mine,using the means of numerical simulation,we analyse the characteristics of abutment pressure distribution of working face of large-mining-height.With the mining height increasing,the results show that the influence range of abutment pressure increases and peak abutment pressure moves ahead to working face.Peak abutment pressure decreases when it exceeds the peak point;Advancing speed of working face and abutment pressure are in opposite relationship.Ground pressure of working face increases with the accelerating of advancing speed of working face and decreases with the reduction of advancing speed of working face.With the increasing of mining height,the range of caving zone increases and fractured zone height elevates.