毛坪铅锌矿下向分层进路胶结充填采场结构参数优化

为探讨毛坪铅锌矿所采用的下向分层胶结充填采矿法采场结构参数的合理性，采用数值模拟手段对不同断面尺寸和不同埋藏深度的采场稳定性进行了计算，系统分析了充填体顶板及采场周边应力与塑性区等的变化规律。研究结果表明：随着进路跨度和采深的增加，进路四周拉应力值逐渐增大，当跨度超过5 m后，拉应力值已非常接近充填体抗拉强度；而当采深达到560 m时，拉应力范围几乎扩展到整个围岩，说明采场稳定性下降，存在拉破坏可能性。从本次计算情况看，在现有采深时（采深400~450 m），进路最大跨度不宜超过5 m；而如果维持3.5 m的进路跨度持续向下开采，则适用的最大采深应在600 m左右，否则采场的稳定性难以得到有效保证。

Optimization of Stope Structure Parameter of Downward Drift Slicing and Cementing Fill Mining Method in Maoping Lead-zinc Mine

In order to discuss the rationality of stope structure parameters of downward drift slicing and cementing fill mining method in Maoping lead-zinc mine，the stope stability at different drift section size and buried depth were calculated by the numerical simulation method，and the change rules of stress and plastic zones of backfill roof and stope surrounding were analyzed systematically.The results show that：with the increasing of drift span and buried depth，the tensile stress at stope surrounding rock also increases gradually.When the drift span reaches 5 m，the tensile stress is very close to tensile strength of backfill，and if the mining depth over 560 m，the tensile stress zone almost expands to the whole surrounding rock，which indicates that the stope stability has reduced，and the stope is likely to fail.From the calculation results，the maximum drift span should not exceed 5 m at the current mining depth（the depth is 400~450 m)，and if we continue to deep mining at 3.5 m drift span，the biggest mining depth should be less than 600 m.Otherwise，it is hard to ensure the stope stability.