复式楔形掏槽在马路坪矿切割上山中的应用

Application of double wedge cut in Maluping mine's upward incise

为了改善贵州开磷集团马路坪矿地下切割上山的掘进效果,为矿房矿石回采创造良好的自由面和岩石碎胀空间,进而提高切割上山掘进的效率和整个矿房的安全高效回采效率,通过分析独头工作面切割上山不同掏槽方式的作用机理,结合马路坪矿的工程地质和实际生产概况,在以往切割拉槽爆破技术的基础上进行工艺改进,通过对比分析提出了二级复式楔形掏槽技术方法,并在马路坪矿中磷640分层3#底柱北四矿房进行了现场爆破试验.结果证明,该复式楔形掏槽可以提高掏槽爆破中槽腔形成效果,掏槽体积更大,槽腔碎石初始动能大,同时改善了切割上山工作面的安全工作条件,为切割上山掘进工艺改进提供了新的思路.

To improve the excavation results of the underground upward incise in Maluping mine of Guizhou Kailin group ,and provide the good free face to blast hole and the expand space to broken rock for enhancing the efficiency of excavation and the whole chamber mining , the cut process was re-searched by analyzing the action mechanism of different cut in upward incise .Combined with the engi-neering geological data and actual production of Maluping mine ,the process improvement of tunneling blasting was optimized based on the original ,then putting forward the double wedge cut method and taking the field tests in the forth chamber of 3th bottom of layered 640 of Maluping mine .The results show that the method improves the effect of cavity formation in the cut blasting ,enlarging the more cavity volume and enhancing the initial kinetic energy of broken rock ;meanw hile ,it also improves the safe w orking conditions in the working place .