基于采硐开采技术的端帮煤回采及边坡稳定性分析研究

Research on end slope coal mining and slope stability analysis based on mining pit mining technology

为研究新疆某露天煤矿端帮煤回采技术及边坡稳定性,采用理论分析与数值模拟相结合的方法,分析了采硐开采到不同时期的边坡稳定性,研究了露天矿推进度与端帮回采煤量间关系。结果表明:单采硐开采过程中边坡稳定性系数随开采深度增加而不断下降,开采到最大深度250 m时降低至1.09,趋于临界平衡状态;露天矿推进度对端帮回采煤量的影响较大,随着推进度增大,每年能够进行的端帮采煤周期越多,因此在一定区间内资源回收量逐渐上升;当推进度增加到一定程度时,端帮采煤窗口期时间缩短,导致能够进行端帮采煤的层数减小,端帮资源的回采量骤降。

In order to study the end slope coal mining technology and slope stability of the open-pit coal mine in Xinjiang,the article analyzes the slope stability from mining to different periods by combining theoretical analysis with numerical simulation,and studies the relationship between the advance degree of open-pit mine and the amount of end slope mining.The results show that in the process of single mining,the coefficient of slope stability decreases with the increase of mining depth,and decreases to 1.09 when mining reaches the maximum depth of 250 m,which tends to the critical equilibrium state.With the increase of the advance degree of open-pit mine,the end slope mining cycle can be more and more each year,so the amount of resource recovery increases gradually in a certain range.When the advance degree increases to a certain extent,the end slope mining window period is shortened,resulting in a decrease in the number of layers that can be used for end slope mining,and a sudden drop in the recovery of end slope resources.