Mining backfill is commonly used in underground mines. A critical concern of this practice is to evaluate the pressures and total stresses in backfilled stopes to ensure a safe and economic design of barricades, constructed to retain the backfill. When a slurried backfill is placed in a mine stope, excess pore water pressure (PWP) can instantaneously generate and progressively dissipate. The dissipation of the excess PWP and consolidation lead to the development of effective stresses, which in turn lead to an arching effect in the backfilled stope. Until now, arching effect has been largely considered for stress estimation in dry or submerged backfill. The former corresponds to the final state at the end process of the drainage and consolidation of the backfill with a pervious while the latter with an impervious barricade. However, previous studies have shown that the most critical moment for the stability of barricades is during the stope filling. Therefore, the design of barricades requires a proper estimation of the pressure and total stresses during the filling operation. This in turn needs joint consideration of the arching effect and consolidation of the backfill. In this paper, a new solution is developed to evaluate the pressures and stresses in backfilled stopes during the filling operation of cohesionless backfill by considering the self‐weight consolidation and arching effect. The proposed solution is validated by numerical modeling with Plaxis2D. It can thus be used to evaluate the pressures and stresses in backfilled stopes during the stope filling with an impervious barricade.

中文翻译：

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一种用于估计无粘性回填物充填过程中具有不透水基层的回填矿场中总应力和有效应力的解决方案

采矿回填通常用于地下矿山。这种做法的一个关键问题是评估回填采场中的压力和总应力，以确保为保留回填而设计的路障安全经济。当将矿浆回填物放置在矿场中时，多余的孔隙水压力（PWP）会立即产生并逐渐消散。多余的PWP的散布和固结会导致有效应力的产生，进而导致回填采场的拱形效应。迄今为止，在干燥或浸没式回填土中应力估算中主要考虑了拱效应。前者对应于排水的回填和固结最终过程的最终状态，其中透水而后者则具有不透水的路障。然而，先前的研究表明，路障稳定性最关键的时刻是在采场填充期间。因此，路障的设计要求在填充操作期间适当估计压力和总应力。这又需要共同考虑拱形效果和回填的巩固。本文提出了一种新的解决方案，通过考虑自重固结和拱形效应来评估无粘性回填物充填过程中回填采场的压力和应力。通过使用Plaxis2D进行数值建模，对提出的解决方案进行了验证。因此，在不透水路障充填采场期间，它可用于评估回填采场中的压力和应力。