某矿山60 m改90 m高阶段开采技术可行性研究

目前，国内很多采用阶段空场嗣后充填采矿法开采的矿山，沿用传统的经验，阶段高度一般在60 m以内。即使采用更高的阶段，如120 m高阶段，都是采用分段凿岩，即下向大直径深孔的凿岩分两段完成，中间增加了凿岩副水平，提高了生产成本。针对某60 m阶段高度的新建矿山，采用FLAC3D数值分析、Terzaghi计算模型、经验公式等研究手段，从高阶段采场稳定性、充填体稳定性、凿岩方式选择3个方面着手，研究了60 m阶段提高至90 m高阶段采矿的技术可行性。研究结果表明，该矿在采场宽度15 m，充填体的强度在3.24 MPa（配备1∶6）以上时，采用提高底部拉底高度，可以满足90 m高阶段采场的生产工艺及安全要求。随着采矿技术及设备的发展，预计未来越来越多的矿山具备有高阶段采矿的可能，研究成果可为类似矿山提高阶段高度提供参考。

Feasibility Study on a Mine′s 60 m to 90 m High Stage Mining Technology

At present,the domestic many using phase open stoping is made between flat back cut and fill stoping in mining of the mine,the traditional experience,highly generally within 60 m.Even if higher stages are adopted,such as the 120 m high stage,segmented rock drilling is adopted,that is,the rock drilling with large diameter and deep hole downward is completed in two sections,and the secondary drilling level is increased in the middle,which increases the production cost.Aiming at a new mine with a height of 60 m stage,the technical feasibility of mining with a height of 60 m stage to 90 m high stage was studied from three aspects of stope stability,backfill stability and drilling method selection by means of FLAC3D numerical analysis,Terzaghi calculation model and empirical formula.The results show that when the stope width is 15 m and the backfill strength is over 3.24 MPa (equipped with 1∶6),the drilling method of increasing the bottom drawing height can meet the production process and safety requirements of the stope at 90 m high stage.With the development of mining technology and equipment,it is expected that more and more mines will have the possibility of high stage mining in the future.