The stability of the ore pillar and the roof is a key issue in the pillar recovery in unfilled mined-out area.
在空区未充填的情况下回采矿柱，矿柱与采空区顶板的稳定性是一个关键问题。
The stability of the ore pillar and the roof is a key issue in the pillar recovery in unfilled mined - out area.
在空区末充填的情况下回采矿柱，矿柱与采空区顶板的稳定性是一个关键问题。
In this thesis, according to the condition of Mujia Hill, the method of roof cutting and ore pillar dilapidation is proposed.
提出用切顶与矿柱崩落法处理木架山采空区。
It is proved that the occurrence of roof caving and ore pillar fracturing is rapidly decreased, and the whole safety of mining stop is significantly improved.
现场实践证明，采场顶板发生冒落、矿柱出现开裂或片帮等现象急剧减少，采场整体稳定性得到显著提高。
Then, based on the principle of not losing money in mining, the optimal cutting rock height and stoping distance for extracting lying side triangular ore pillar are optimized.
基于不亏本原则，确定回采下盘三角矿体的最合理切岩高度和后退距离。
The paper discusses the new options of short-hole shrinkage: all-over mining, static shrinkage, precipice shrinkage, rock mining conditions, active supporting and ore pillar recovery.
本文探讨了浅孔留矿祛新型变形方案：留矿全面法、静态留矿法、削壁留矿法，以及这些方法的矿岩开采条件，采场主动支护，矿柱回收等。
Based on the stress analysis of filling body, it was pointed out that reducing the destructive function of blasting on the filling body is one of the technical keys in ore pillar extraction.
通过对充填体受力分析，指出减小爆破对充填体的破坏作用是矿柱回采的技术关键之一。
The crown pillar of stope is permanent loss and not recoverable, while sill pillar and barrier pillar shall be recovered after the ore drawing work is completed.
采场的顶柱作为永久矿柱损失，采场底柱、间柱等采场大量放矿完毕后，一次性进行回收。
Bolting manual pillar and room method is a good future method of mining Mn ore body of medium thickness and small pitch.
人工柱锚杆房柱法是一种有前途的开采中厚缓倾斜锰矿床的采矿方法。
Population and application of the dilution ratio ore drawing method has certain social value and economic value for implementation of the sill pillar-free subdrifting method.
低贫化放矿的推广应用对于实行无底分段崩落法的矿山具有一定的社会价值和经济价值。
Deficient floor slope Angle of an ore body often needs to dig a drift (or access) in its footwall rock when adopting non-pillar sublevel caving following-vein excavation.
采用沿脉布置的无底柱分段崩落法，当矿体底板倾角不足时，需要在下盘岩石中开掘进路。
Cut-off grade method has been used to control the ore drawing in non-pillar sublevel caving mining both in and outside China.
采用无底柱分段崩落采矿法，国内外一直采用截止品位放矿法来控制出矿。
According to the numerical results and the states of the mining filed, the final mining method of ore-pillar recovery is determined.
根据数值计算的结果，并结合矿山现场的实际情况，确定矿柱回采试验的最终方案。
Disadvantages of sublevel caving without sill pillar lie in high ore loss and dilution as well as difficult control of ore loss and dilution.
无底柱分段崩落采矿法存在损失贫化大和损失贫化难以控制的缺点。
According to mining condition in Xinli mining area, the room and pillar filling method for large and thick ore-body is determined after research.
根据新立矿区开采技术条件，研究确定对厚大矿体采用分矿房矿柱分层充填法开采。
According to mining condition in Xinli mining area, the room and pillar filling method for large and thick ore-body is determined after research.
根据新立矿区开采技术条件，研究确定对厚大矿体采用分矿房矿柱分层充填法开采。
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