Underground mined-out voids need to be backfilled for the stability of the surrounding rock and also to increase ore extraction from adjacent pillars. One of the relatively newer means is cemented paste backfilling, which has been extensively adopted in underground mining operations around the world. During and after the placement of cemented paste backfill (CPB) into stopes, complex multiphysics (thermal, hydraulic, mechanical and chemical) processes take place in the large mass of CPB and could affect its consolidation behavior. An analysis of the consolidation process in CPB mass is essential for the assessment of CPB behavior and cost-effective designs in practice. In this paper, multiphysics simulation of the consolidation behavior of CPB mass is performed under different conditions, including the mixture recipe, and backfilling, drainage, surrounding rock and curing conditions. It is found that the in situ consolidation behavior of CPB structures is a function of the multiphysics processes that occur in the cementing backfill mass. Moreover, the rock mass conditions, including the geometry and rock wall roughness, influence the consolidation process of CPB structures. Cement content, curing time and backfilling rate play a crucial role in the consolidation process of CPB. The obtained results can facilitate a better understanding of the consolidation behaviour of CPB for backfill designers and engineers, and thus contribute to enhance the engineering of CPB structures.

中文翻译：

---

大型水化充填体固结行为的数值模拟

地下开采空洞需要回填，以保证围岩的稳定性，并增加相邻矿柱的矿石开采量。一种相对较新的方法是水泥浆回填，它已在世界各地的地下采矿作业中广泛采用。在将胶结膏体回填 (CPB) 放入采场期间和之后，大量 CPB 中会发生复杂的多物理场（热、水力、机械和化学）过程，并可能影响其固结行为。分析 CPB 质量中的固结过程对于评估 CPB 行为和实践中的成本效益设计至关重要。在本文中，对 CPB 质量固结行为的多物理场模拟是在不同条件下进行的，包括混合配方、回填、排水、围岩和养护条件。发现 CPB 结构的原位固结行为是固井回填体中发生的多物理场过程的函数。此外，岩体条件，包括几何形状和岩壁粗糙度，会影响 CPB 结构的固结过程。水泥含量、养护时间和回填率在 CPB 的固结过程中起着至关重要的作用。所得结果有助于回填设计师和工程师更好地了解 CPB 的固结行为，从而有助于增强 CPB 结构的工程设计。岩体条件，包括几何形状和岩壁粗糙度，会影响 CPB 结构的固结过程。水泥含量、养护时间和回填率在 CPB 的固结过程中起着至关重要的作用。所得结果有助于回填设计师和工程师更好地了解 CPB 的固结行为，从而有助于增强 CPB 结构的工程设计。岩体条件，包括几何形状和岩壁粗糙度，会影响 CPB 结构的固结过程。水泥含量、养护时间和回填率在 CPB 的固结过程中起着至关重要的作用。所得结果有助于回填设计师和工程师更好地了解 CPB 的固结行为，从而有助于增强 CPB 结构的工程设计。