石头梅一号露天煤矿南排土场扩容方案及稳定性研究

Expansion scheme and stability study of south dump in Shitoumei No.1 Open-pit Coal Mine

为了减少露天煤矿外排运输距离和减少土地占用,以石头梅一号露天煤矿南外排土场为工程背景,通过理论分析和数值模拟的方法对外排土场的扩容方案和稳定性就行了研究。通过理论分析基底极限承载能力,采用普朗特尔-赖斯公式计算出排土场最大高度为134 m;采用Bishop法分析分析排土场边坡的稳定性,得出排土场边坡稳定系数随单台阶高度的增加逐渐降低,优化后的单台阶高度为30 m;排土场稳定系数随着帮坡角的增加急剧降低,优化后的帮坡角为21°。

In order to reduce the transportation distance of external dumping and land occupation of open-pit coal mines,taking the south external dump of Shitoumei No.1 Open-pit Coal Mine as engineering background,the article studies the expansion plan and stability of external dump through theoretical analysis and numerical simulation.Through theoretical analysis of the ultimate bearing capacity of the foundation,the maximum height of the waste dump is calculated to be 134 m using the Prandtl Rice formula.The Bishop method is used to analyze the stability of the dump slope,and it was found that the stability coefficient of the dump slope gradually decreases with the increase of the single step height.The optimized single step height is 30 m.The stability coefficient of the dump decreases sharply with the increase of the slope angle,and the optimized slope angle is 21°.