According to the mining method for Dongguashan Copper Mine and Tongkeng Mine in China, and with the help of the cavity monitoring system（CMS） and mining software Surpac, the 3D cavity models were established exactly...According to the mining method for Dongguashan Copper Mine and Tongkeng Mine in China, and with the help of the cavity monitoring system（CMS） and mining software Surpac, the 3D cavity models were established exactly. A series of correlative techniques for calculating stope over-excavation and under-excavation, stope dilution and ore loss rates, and the blasting design of the pillar with complicated irregular boundaries were developed. These techniques were applied in Dongguashan Copper Mine and Tongkeng Mine successfully. Using these techniques, the dilution rates of stopes 52-2^#, 52-6^#, 52-8^#and 52-10^# of Dongguashan Copper Mine are calculated to be 2.12%, 8.46%, 12-67% and 10.68%, respectively, and the ore loss rates of stopes 52-6^# and 5-8^# are 4.41% and 3.70%, severally. Furthermore, according to the design accomplished by the technique for a pillar of Tongkeng Mine with irregular boundary, the volume, total length of boreholes and the dynamite quantity of the pillar are computed to be 1.2 ×10^4 m^3, 2.98 km and 10.97 t, correspondingly.展开更多
在对华锡集团铜坑矿隐患空区现场实测的基础上,采用隐患空区三维信息获取方法准确获取空区的位置形态、体积、顶板面积及边界等信息。结合92号矿体周边采场分布特点,选取205-2,203-2,201-2和202-2这4条勘探线上的隐患空区为研究对象,在...在对华锡集团铜坑矿隐患空区现场实测的基础上,采用隐患空区三维信息获取方法准确获取空区的位置形态、体积、顶板面积及边界等信息。结合92号矿体周边采场分布特点,选取205-2,203-2,201-2和202-2这4条勘探线上的隐患空区为研究对象,在分析其空间特征信息的基础上,分别结合国际矿业软件Surpac与岩石破裂过程分析软件RFPA(rock failure process analysis)软件构建这4条勘探线上隐患空区数值计算模型,综合考虑矿区初始应力场和空区周边爆破动力扰动作用的影响,运用RFPA开展隐患空区动力失稳过程模拟仿真,模拟空区从形成到动力扰动作用下破坏过程的裂纹扩展规律。研究结果表明:动力扰动使空区应力集中加强,并加速空区裂纹扩展,尤其对间柱产生强烈冲击,致使裂纹贯通,矿柱破坏;该研究成果可为我国大范围隐患空区灾害预测和控制提供技术支持。展开更多
基金Projects(2007BAK22B04, 2006BAB02B05) supported by the National 11th Five-Year Science and Technology Supporting Plan of ChinaProject(50490274) supported by the National Natural Science Foundation of China
文摘According to the mining method for Dongguashan Copper Mine and Tongkeng Mine in China, and with the help of the cavity monitoring system（CMS） and mining software Surpac, the 3D cavity models were established exactly. A series of correlative techniques for calculating stope over-excavation and under-excavation, stope dilution and ore loss rates, and the blasting design of the pillar with complicated irregular boundaries were developed. These techniques were applied in Dongguashan Copper Mine and Tongkeng Mine successfully. Using these techniques, the dilution rates of stopes 52-2^#, 52-6^#, 52-8^#and 52-10^# of Dongguashan Copper Mine are calculated to be 2.12%, 8.46%, 12-67% and 10.68%, respectively, and the ore loss rates of stopes 52-6^# and 5-8^# are 4.41% and 3.70%, severally. Furthermore, according to the design accomplished by the technique for a pillar of Tongkeng Mine with irregular boundary, the volume, total length of boreholes and the dynamite quantity of the pillar are computed to be 1.2 ×10^4 m^3, 2.98 km and 10.97 t, correspondingly.
文摘模块化多电平换流器(modular multilevel converter,MMC)近年来得到了广泛的发展与应用。电容器是MMC中子模块(sub-module,SM)的重要组成部分与关键元件,承担直流支撑与储能工作。为保证MMC系统的安全可靠运行,有必要对子模块电容器状态监测方法展开研究。基于MMC系统运行特性,提出一种在工频周期内对子模块电压进行多相位点采样,并结合系统控制侧开关信号、调制比与交流侧电流电压幅值、相位等信息构建电压电流状态方程,以求解电容值与等效串联电阻(equivalent series resistance,ESR)值等状态特征参量的子模块电容器状态监测方法。随后搭建单相七电平MMC系统仿真平台与半实物仿真平台,对上述方法的可行性与准确性进行验证。仿真结果表明子模块电容器C值监测误差绝对值小于0.03%,ESR值监测误差绝对值小于0.5%。实验结果表明C值监测误差绝对值小于1.5%,ESR值监测误差小于10%,满足子模块电容器状态监测要求。
文摘在对华锡集团铜坑矿隐患空区现场实测的基础上,采用隐患空区三维信息获取方法准确获取空区的位置形态、体积、顶板面积及边界等信息。结合92号矿体周边采场分布特点,选取205-2,203-2,201-2和202-2这4条勘探线上的隐患空区为研究对象,在分析其空间特征信息的基础上,分别结合国际矿业软件Surpac与岩石破裂过程分析软件RFPA(rock failure process analysis)软件构建这4条勘探线上隐患空区数值计算模型,综合考虑矿区初始应力场和空区周边爆破动力扰动作用的影响,运用RFPA开展隐患空区动力失稳过程模拟仿真,模拟空区从形成到动力扰动作用下破坏过程的裂纹扩展规律。研究结果表明:动力扰动使空区应力集中加强,并加速空区裂纹扩展,尤其对间柱产生强烈冲击,致使裂纹贯通,矿柱破坏;该研究成果可为我国大范围隐患空区灾害预测和控制提供技术支持。
