论文部分内容阅读
汤丹铜矿矿体开采技术条件极为苛刻,矿体及围岩松散、破碎、含泥量高、自稳能力差,造成采矿过程中凿岩成孔率低、放矿困难、贫损高、生产能力差等诸多困难。通过对不同注浆的方法对比、理论计算、类比分析,确定采用裂隙化学注浆方案;通过化学浆液注入矿体及上盘部分围岩裂隙中,将松散的岩体黏结为一个整体,从而改善工程岩体的力学特性、完整性,提高炮孔成孔率及各项采矿指标;采用力学计算、室内实验及ANSYS与FLAC3D数值模拟,通过9种方案对比,得出顶柱15 m、矿柱16 m、矿房12 m为最佳设计方案。现场工业试验结果表明:裂隙高压化学注浆浅孔留矿法可以增强矿岩稳定性,提高采场安全系数,增加存窿矿石流动性,降低贫损指标,实现软弱破碎矿体的安全高效开采。
The technical conditions for ore body mining in Tangdan Copper Mine are extremely harsh. The ore bodies and surrounding rock are loose and broken, with high clay content and poor self-stability, resulting in low drilling rate, poor ore drawing, high loss and high production in the mining process Poor ability and many other difficulties. Through the comparison of different grouting methods, theoretical calculation and analogy analysis, it is determined that the chemical grouting method of fractures is adopted; the loose groud rock mass is integrated into the fractures of the ore body and part of the upper plate through the chemical grout so as to improve Mechanical properties and integrity of the engineering rock mass, and improve the hole rate and various mining targets; using mechanical calculation, laboratory experiments and numerical simulation with ANSYS and FLAC3D, through the comparison of 9 schemes, 16 m, mine 12 m is the best design. Field industrial test results show that the fracturing high-pressure chemical grouting shallow hole stay-mining method can enhance the stability of ore rock, improve the safety factor of stope, increase the fluidity of deposit ore, reduce the loss index and realize the safe and efficient mining of weak and broken ore body .