综采工作面大型构造超深孔爆破研究

Large-scale Structural Ultra-deep Hole Blasting in Fully Mechanized Mining Face

利用某矿综采工作面陷落柱典型细砂岩的基本动态力学特性和水胶炸药爆炸参数,采用Cowper-Symonds模型,在岩体爆破破碎区采用Mises破坏准则,通过ANSYS LS/DYNA有限元软件,对柱状装药在半无限岩体内爆破破裂损伤区范围进行了数值模拟,得到了炸药半径与裂隙区半径之间的量化关系,据此设计了大直径超深孔扩裂爆破参数,并进行了现场试验研究。实验结果表明,采用大直径超深孔扩裂爆破快速处理综采工作面内的大型构造是可行的,回采速度提高了40%以上,截齿消耗降低了79.5%。

Based on the basic dynamic mechanical properties of typical fine sandstone and explosion parameters of hydrogel explosive in subsidence pillar of a fully mechanized mining face of a mine,the damage area of cylindrical charge in the blasting-induced fractured area of semi-infinite rock mass was numerically simulated with ANSYS-LS/DYNA finite element software,by using Cowper-Symonds model and Mises failure criterion in the blasting-induced fractured area of rock mass.Then the quantitative relationship between explosive radius and fissure radius was obtained.Based on this,the parameters of large-diameter and ultra-deep hole blasting for crack extension were designed and field test was carried out.The results showed that it was feasible to adopt large-diameter and ultra-deep hole blasting for crack extension for rapidly dealing with fully mechanized mining face with large structures.The stoping speed was increased by more than 40%and the consumption of pick was reduced by 79.5%.