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扩大下向进路式充填采矿法的回采断面可以提高生产能力,但大断面下顶板充填体的稳定性是安全回采的关键。利用RFPA—2D建立下向进路式充填采矿法回采模型,针对3 m×3 m、5 m×3 m、5 m×4 m 3种不同回采断面进行数值模拟,得到了不同回采断面下顶板充填体破裂过程中声发射的能量特征和空间分布规律。这些特征和规律为合理确定最佳回采断面提供了理论依据。
Expanding the mining section of the down-fill mining method can increase the production capacity, but the stability of the top-plate filling body under large section is the key to safe recovery. Using the RFPA-2D to establish a subsidence-filling method, the numerical simulation of three different sections with 3 m × 3 m, 5 m × 3 m and 5 m × 4 m was carried out. The roof under different mining sections Energy Characteristics and Spatial Distribution of Acoustic Emissions in Fracture Process of Backfill. These characteristics and laws provide the theoretical basis for judging the optimal mining section rationally.