旺格维利开采的等效条带开采宽度数值模拟研究

Numerical Simulation Study on Width of Equivalent Dimension Strip Mining in Wongawilli Mining

通过数值模拟方法分析了旺格维利开采后覆岩、煤柱应力状态和关键层沉降情况随着旺采回采支巷两侧采出率、采硐垂深的变化而变化的规律;根据旺采煤柱的塑性区范围圈定对应条带开采宽度范围,进一步通过关键层的沉降曲线,采用夹逼方法得到与旺采最为接近的等效条带开采宽度;对比分析旺采与等效条带开采的模型应力分布特征,结果表明旺格维利开采可以等效为条带开采,条带开采宽度主要受旺采的回采支巷宽度、回采支巷两侧采硐采出率和采硐垂深影响,最终确定了旺采的等效条带开采宽度的计算公式。

Through numerical simulation, analyze the stress environment of overburden and pillar after coal mining, the subsidence situation of key stratum changes regularly with the change of recovery rate in Wongawilli mining branch tunnel sides and mining chamber vertical depth. According to the plastic zone range of the Wongawilli mining coal pillar, the corresponding strip mining width range is delineated, futher research about key stratum settlement curve, the equivalent strip mining width closest to the Wongawilli mining is obtained by the clamping method. The result showed that Wongawilli mining can be equivalent to the strip mining. The width of the strip mining mainly influenced by the width of mining branch tunnel, recovery rate in mining branch tunnel sides and mining chamber vertical depth. Finally, the formula for calculating the equivalent strip mining width of Wongawillimining is determined.