Cemented paste backfill (CPB), which is prepared by mixing tailings, binder and water, is widely used in underground mines for waste management and ground control. Since the CPB is delivered into mined-out areas in the form of fluid, a barricade needs to be constructed for retaining it during the process of its filling and hardening. Therefore, the barricade should have enough mechanical stability to ensure the safety of the backfill operation. The behavior of CPB, which is influenced by the thermal, hydraulic, mechanical and chemical (THMC) coupled processes, acts on the barricade and thus affects its mechanical response. In the present study, a numerical model is developed to predict and analyze the barricade mechanical performance in response to the coupled THMC behavior of CPB. The validity of the proposed model is then verified against two field case studies. Acceptable agreement between the model prediction results and in situ monitoring data proves the capability of the developed model in simulating the barricade pressure and displacement. Then, the validated model is used to investigate the effect of filling strategy on the barricade displacement. The obtained results can contribute to a better understanding of the barricade performance under various backfill conditions.

中文翻译：

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路障对水泥浆回填耦合 THMC 行为的机械响应

由尾矿、粘合剂和水混合制成的水泥浆充填物 (CPB) 广泛用于地下矿山的废物管理和地面控制。由于 CPB 以流体的形式输送到采空区，因此需要建造路障以在其填充和硬化过程中将其挡住。因此，路障应具有足够的机械稳定性，以保证回填作业的安全。CPB 的行为受热、水力、机械和化学 (THMC) 耦合过程的影响，作用于路障，从而影响其机械响应。在本研究中，开发了一个数值模型来预测和分析路障机械性能，以响应 CPB 的耦合 THMC 行为。然后根据两个现场案例研究验证所提出模型的有效性。模型预测结果与原位监测数据之间的可接受一致性证明了所开发模型在模拟路障压力和位移方面的能力。然后，通过验证模型研究填充策略对路障位移的影响。获得的结果有助于更好地了解各种回填条件下的路障性能。