基于PFC2D-DFN的自然崩落法数值模拟研究

采用二维颗粒流软件PFC2D构建矿山模型，引入符合矿山实际节理产状的DFN网络，基于室内岩石试验及矿山实际崩落情况，标定模拟所用细观参数。以某工程应用为实例，模拟分析崩落破坏机理与崩落区演化趋势。结果表明：裂纹发起于推进面与顶板交界处，在拱形区域内密集扩展、贯通，矿岩破裂以节理拉伸破坏为主，矿堆以岩石剪切破坏为主；崩落区前期呈拱形演化，崩透地表后引起邻近高陡边坡滑动；部分拉底仅造成新开挖顶板上方局部崩落。该研究结果可对矿山崩落采矿起到指导作用。     

滇西北羊拉铜矿床3175 m中段铜矿石和构造岩地球化学特征及地质意义

羊拉铜矿床是金沙江缝合带内的典型代表性铜矿床,其矿体呈层状、似层状、脉状及透镜体状产出,且明显受断裂构造及层间破碎带控制.采用电感耦合等离子体质谱仪(IC P-M S)分析技术重点对羊拉矿床里农矿段深部3175 m中段铜矿石和断裂构造岩进行主量和微量-稀土元素组成研究.结果表明,铜矿石和各构造岩均富集CaO、Al2 O...     

Mechanical properties and microstructure evolution of solidified copper tailings with hydantoin epoxy resin

Based on the strength and microstructure tests, the effects of the hydantoin epoxy resin content and curing time on the mechanical properties and microstructure of copper tailings specimens were studied. The results showed that the strength of the solidified specimens was increased to 20.84 MPa with 30 wt.% addition of hydantoin epoxy resin. When the specimens with 10% hydantoin epoxy resin were cured for 7 and 14 d, the strengths were 6.33 and 6.67 MPa respectively, which met the requirements as foundation filler and building materials. The microscopic tests showed that the agglomeration was enhanced and the porosities of the solidified specimens were reduced with increase in the hydantoin epoxy resin content, which could greatly enhance the strength of solidified specimens.     

节理岩体矿岩块度三维模拟研究

为实现矿岩块度预测的三维可视化模拟,根据岩体内节理面倾向、倾角和节理间距等几何参数的分布规律,采用Boost Random库实现节理面Monte Carlo随机模拟,从而建立原始块度预测的节理素描文件,然后引入崩落块度修正系数计算崩落块度预测的节理素描文件。根据节理素描文件数据计算三维节理面网络,逐个取出节理面平面,对模拟范围的长方体模型进行切割,建立块度三维模型。利用块度三维模型分别计算块体的容积系数和共线性值,对块体进行形状分类。结合VTK库和HOOPS 3D实现上述算法,以普朗铜矿自然崩落法为例对首采区原始块度进行预测：块体体积的四分位点分别为0.164,0.403,0.853 m3,块体等效尺寸在0.5～3.0 m区间时块体占较大的体积百分比;同时,根据块体等效尺寸分布曲线得到放矿口的尺寸应大于5 m×5 m。研究结果表明：该方法能够根据现场节理面调查结果模拟岩体内节理分布,进而利用矿岩块度三维模型实现矿岩块度的预测和统计分析,为自然崩落法开采研究提供了重要依据。