二次卸荷中边坡应力变化规律的相似试验研究

Study on Variation of the Slope Stresses During the Secondary Unloading Process Based on Similar Experiment

通过相似试验,研究了驻留矿体开采边坡岩体应力变化机理,分析了边坡稳定性情况。研究表明,在露天开采过程中,水平应变呈增加趋势,地应力向露天采空区方向卸荷;驻留矿体的开采过程中,水平应变呈减小趋势,边坡内部应力重新分布,地应力向地下采空区方向卸荷,在地下采空区周围形成应力集中区,从而使边坡表面水平应力呈减小趋势。但驻留矿体的开采不会对边坡的稳定性产生较大影响。

Through similar experiment study, the stress transformation mechanism of slope rock mass in the mining process of resident ore-body was studied, and its slope stability was analyzed. The research showed that during open pit mining process, the horizontal strain tends to increase, and ground stresss unloads at open mined-out area; During the min- ing process of resident ore-body, the horizontal strain tends to decrease, the slope internal stress is redistributed, and the ground stress unloads at underground mined-out area. Stress concentration area is formed around underground mined-out ar- ea, which leads to decreasing of slope surface horizontal stress. But resident ore-body mining produces less impact on slope stability.