Deformation based hanging wall failure prediction

空场采矿是加拿大最常用的采矿方法之一，因为加拿大盾的岩石类型很强，生产率高，与这种采矿方法相关的开采率高。采场贫化或采场表面整体破坏形式的不稳定性通常发生在采场上盘上，并且可以显著增加采矿成本。上盘稀释和破坏的预测通常依赖于基于应力、开口几何形状以及岩体的条件和性质的经验和数值设计方法。这些方法已经取得了一定的成功，但是，在采场爆破，采矿，矿石接触不规则性和开放时间的变化是很难量化的，只是成功预测采场稳定性的一些挑战。该方法来自于一个成熟的露天矿边坡破坏预测方法。所提出的方法依赖于上盘变形行为相对于时间加速。当表示开口几何形状的值除以测量的变形接近零时，预测失效。该方法已根据历史数据进行了尝试，并显示出一定的前景。

Open stope mining is one of the most commonly used mining methods in Canada because of the strong rock types of the Canadian shield, high production rates and the high extraction ratios associated with this mining method. Instability in the form of stope dilution or overall failure of stope surfaces commonly occurs on the stope hanging wall and can add significant costs to mining. The prediction of hanging wall dilution and failure commonly relies on empirical and numerical design methods based on stress, opening geometry and the condition and properties of the rock mass. These methods have enjoyed some success, however, variability in stope blasting, backfilling, ore contact irregularity and time open are difficult to quantify and are just some of the challenges for the successful prediction of stope stability.This project is directed towards investigating the relationship between deformation and the size of an underground excavation. The approach comes from a proven method of failure prediction developed for open pit mine slopes. The proposed method relies on hanging wall deformation behaviour accelerating with respect to time. As the value representing the opening geometry, divided by the measured deformation approaches zero, failure is predicted. The approach has been tried based on historic data and shows some promise.