中文摘要：

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。

英文摘要：

The section enlargement of mining drifty for underhand drift stoping with filling production capacity.However,the stability of roof fill is the key to safety mining for large cross-section drifty stoping.A mining model for underhand drift stoping with filling was established by using the RFPA-2D.The numerical simulation of mining drifty with different cross-section,including 3m×3m,5 m×3 m and 5 m×4 m,was carried out.The energy characteristics and spatial distribution of acoustic emission in the failing process of roof fill under different cross-section of mining drift were investigated.The research results provide theoretical basis for the determination of optimal cross-section of mining drifty.